2023 Huawei H12-821_V1.0-ENU Exam Dumps Questions

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March 23, 2023

Huawei certification is a highly valuable and sought-after certification for IT professionals seeking to enhance their knowledge and expertise. H12-821_V1.0-ENU exam is specifically designed to validate the skills required to configure and maintain the HCIP-Datacom platform, which is widely used by businesses around the world. These H12-821_V1.0-ENU exam dumps questions are specifically designed to help you prepare for the exam by testing your knowledge and providing you with valuable insights into the types of questions that you will encounter. Test free Huawei H12-821_V1.0-ENU exam questions below.

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1. In the broadcast network shown in the figure, OSPF runs on four routers, and they are in the same area and the same network segment. OSPF will automatically elect a DR and a BDR, and the other two routers will become DR other, so as to achieve a better backup effect.

TRUE

FALSE

2. What packet types does OSPF include? (Multiple choice)

Link State DD

Hello

Link State Request

Database Description

3. In MTSP, ____ port is a special domain edge port, and its role on CIST is Root Port.

4. In a broadcast network, what mechanism does the IS-IS protocol use to ensure the reliability of neighbor relationship establishment?

Status synchronization

Aging timer

Checksum

Three handshakes

5. As shown in the figure, all three switches run the RSTP protocol, so which one of the following descriptions about the topology convergence process is correct?

The upstream link port of SW2 will immediately enter the Forwarding state after receiving the RSTBPDU with the Proposal bit set from SW1.

When the network is initialized, the ports of all the switches in the figure are designated ports and are in the Discarding state

The edge port of SW3 will immediately enter the Forwarding state after a round of P/A mechanism

The device interconnection port of the downstream link quickly enters the Forwarding state through the P/A mechanism

6. Which of the following descriptions of IS-IS area division are correct? (Multiple choice)

In IS-IS, Level1-1-2 routers connect the backbone area and non-backbone area.

In IS-IS, different interfaces of a single router can belong to different areas

Ports can belong to different areas. In IS-IS, a fixed area is defined as a backbone area.

In IS-IS, each router can only belong to one area.

7. Which of the following statements regarding OSPF multi-instance is false?

Route exchange between different OSPF processes is similar to route exchange between different routing protocols.

An interface of a router belongs to only a certain OSPF process.

The OSPF process IDs must be the same when OSPF neighbor relationships are established between different routers.

Multiple OSPF processes can run on the same router, and they are independent of each other.

8. There are many employees in a certain enterprise building, and they usually start to connect to the company's WLAN network in the lobby when they go to work. As each employee walks to their respective workstations, each person's mobile terminal roams through roaming to their respective network coverage areas.

In order to try to ensure that the IP address of each terminal is fixed, what is the recommended method?

Do not configure VLAN Pool, configure a static IP address for each mobile terminal

Configure VLAN Pool and configure Hash algorithm

Configure the VLAN Pool and configure the sequence algorithm

Configure VLAN Pool, any configuration algorithm

9. An enterprise administrator wants to configure single-hop BFD to implement fast detection of direct links.

Which of the following configurations are mandatory?

A. Configure the remote discriminator of a BFD session.

B. Configure the local discriminator of a BFD session.

C. Configure a multicast IP address for BFD.

D. Enable BFD globally.

10. Which of the following statements regarding the MED value in BGP are true?

According to BGP route selection rules, the MED value has a lower priority than AS_Path, Preferred-Value, Local-Preference, and Origin.

The default MED value of BGP routes is 0.

By default, BGP can compare the MED values of routes from different ASs.

By default, if there is no MED value in routes, the value 0 is used. If the bestroute med-none-as-maximum command is configured, the maximum MED value 4294967295 is used.

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11. The header of an IP packet is shown in the figure.

Based on this packet, which of the following is correct?

The packet must be an IPsec VPN packet encapsulated with only AH

The protocol number is 51, which means that the message after the IP Header is the AH header

The protocol number is 51, which means that the message after the IP Header is the ESP header

The message is an IPsec VPI message, and the data part of the message is encrypted

12. The four routers R1, R2, R3 and R4 enable OSPF to establish neighbor relationships. The topology and related parameters are shown in the figure.

At this time, R2 is disconnected for some reason, so the Hello report transmitted between R1, R3 and R4 In the text, which of the following is the value of the BDR field?

12.12.12.2

12.12.12.3

12.12.12.1

0.0.0.0

2.2.2.2

1.1.1.1

13. The router directly guides the forwarding of data according to the FIB forwarding table.

TRUE

FALSE

14. As shown in the figure, a sham link is established between PE1 and PE2 through the LoopBack D interface. CE2 can learn the route of the 192.168.1.0/24 network segment (direct route on CE1) through the sham link and backdoor link. When all other parameters are kept at their default configuration, the cost value of the route from CE2 to the 192.168.1.0/24 network segment should be ()

15. Configure OSPF area 10 as a Totally NSSA area. The commands that need to be configured are:

[Huawei] ospf 1

[Huawei-ospf-1] area 10

[Huawei-ospf-1-area-0.0.0.10] nssa ______

16. A large number of routes typically exist in a BGP routing table, and transmitting such extensive routing information brings a heavy burden to a device. In order to address this problem, it is necessary to filter those routes to be advertised. You can configure a device to advertise only necessary routes or those that its peers require.

TRUE

FALSE

17. OpenSent

3-1-2-5-4

1-3-5-2-4

3-5-1-2-4

3-1-5-2-4

18. In the Router LSA of OSPF, if its Link Type is 1, the LSA describes the point-to-point link from this router to the neighbor router. At this time, the corresponding Link ID describes the content of the neighbor router. Interface IP address.

TRUE

FALSE

19. For the same multicast source, the device can determine the only multicast traffic incoming interface on the device through RPF inspection.

TRUE

FALSE

20. If you want to achieve communication between different protocols, you can only use route introduction.

TRUE

FALSE

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21. Which of the following descriptions of BGP Next_Hop attributes is incorrect?

BGP will first check whether the next hop of the route is reachable before selecting a route. Routes whose next hop is unreachable are inactive routes and cannot participate in BGP route selection.

In actual application, sometimes it is necessary to modify the next hop

The address of Next Hop must be the IP address of the neighbor device interface.

This attribute is a recognized mandatory attribute

22. Which of the following message types does BGP include? (Multiple choice)

Update

Hello

Open

Keepalive

23. When the HSB backup group is enabled in the WLAN network, if the AP adds AP information offline on the backup AC after the main AC comes online, the AP status on the backup AC will be displayed as fault.

TRUE

FALSE

24. Which statement about RIB and FIB is wrong?

FIB directs the forwarding of packets

The next-hop in RIB is the IP address of the peer directly connected to the neighbor interface

FIB is generated by RIB

RIB does not directly guide the forwarding of packets

25. DRAG DROP

OSPF networks are classified into four types of networks by link layer protocol.

Drag the following link layer protocols to the corresponding network types. (Token is reusable)

26. The router received two BCP routes containing the following attributes.

According to BGP routing rules, which of the following descriptions is correct?

The optimal route is route N because its AS-Path is longer than route

The optimal route is route N, because its MED is smaller than route

The optimal route is route M because its AS-Path is shorter than route

The optimal route is route M because its MED is larger than route

27. As shown in the figure, R1 and R2 have configured the local sending time interval, the local receiving time interval and the local BFD detection multiple in BFD.

Now R1 and R2 are detected using query mode, so what is the actual detection time of R1?

1400 milliseconds

1000 milliseconds

350 milliseconds

250 milliseconds

28. DRAG DROP

Match the following IPv4 multicast protocols with the corresponding functions.

29. Which of the following understanding of DR/BDR is wrong? (Multiple choice)

The network address monitored by DR other is 2240.0.6

In a broadcast network, DR and BDR must be elected. Without either DR or BDR, the broadcast network cannot work properly

The multicast address that DR other monitors is 224.0.0.5

All DR other only establish adjacency with DR and BDR

30. In inter-AC roaming scenarios, an AC can function as the mobility server of multiple mobility groups, but can be added only to one mobility group.

TRUE

FALSE

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31. Which of the following is the command to configure the VRRP preemption delay?

vrrp vrid 1 preempt-mode timer delay 20

vrrp vrid 1 timer delay 20

vrrp vrid 1 preempt-timer 20

vrrp vrid 1 preempt-delay 20

32. Regarding BGP MED, which of the following descriptions are correct? (Multiple choice)

The default value of BGP route MED is 0

By default, BGP route selection rules can compare the distance between routes from different autonomous systems

By default, if there is no MED value set in the route attribute, press Process. If the best route med-none-as maximum command is configured. Then the maximum value of the MED correction is 4294967295 to process

In BGP route selection rules, the priority of MED is lower than AS-Path, Preferred-Value, Local-Preference, Origin.

33. Which of the following descriptions about OSPF route aggregation is incorrect?

Any router in OSPF can perform route aggregation operations.

OSPF has two route aggregation methods: ABR aggregation and ASBR aggregation

Route aggregation refers to aggregating routing information with the same prefix and publishing only one route to other areas.

Through route aggregation, routing information can be reduced, thereby reducing the size of the routing table and improving router performance.

34. A certain router runs IS-IS and its output information is shown in the figure.

Which of the following statements is correct? (Multiple choice

The S4/0/0 interface of this router has established the neighbor relationship of Level1-1 and Level-2 at the same time

The S4/0/0 interface of this router only establishes the neighbor relationship of Level1-1

The GE0/0/0 interface of this router has established the neighbor relationship of Level1-1 and Level1-2 at the same time

The GE0/0/0 interface of this router only establishes the neighbor relationship of Level1-1

35. Regarding the default routes of each protocol, which of the following description is wrong?

BGP can deliver default routes

ISIS can issue default routes

OSPF cannot deliver the default route

Static default routing can be configured

36. Which of the following BGP attributes does not have to exist in the Update message?

Next_Hop

Origin

WITH

AS_Path

37. If roaming is implemented between two APs, the same security policy, forwarding mode and the same () must be met.

38. In order to avoid inter-area loops, OSPF stipulates that routing information is not allowed to be published directly between two non-backbone areas. Routing information is only allowed to be published within an area, or between a backbone area and a non-backbone area. Therefore, each Area Border Router (ABR) must be connected to the backbone area.

TRUE

FALSE

39. How does an IGMPv2 router maintain network segment group membership? (Multiple choice)

The router maintains a timeout timer for each group membership. If the receiver host is received, the timer is refreshed. If the timer expires, the group membership is deleted.

After receiving the eave message, the router immediately deletes the group membership

The router periodically sends a Query message, and the receiver host reports a Report message after receiving the Query message

The router will query for a specific group

40. Three switches run the RSTP protocol, and the topology and configuration are as shown in the figure.

So which of the following descriptions of root bridges is correct?

The root bridge is SWA

The root bridge cannot be determined

The root bridge is SWC

The root bridge is SWB

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41. By default, the sending interval of BFD packets is ______ milliseconds, the receiving interval is ______ milliseconds, and the local detection is ______ times.

42. Which of the following descriptions about configuring the set-overload command in IS-IS is correct?

This command is used to enable IS-IS to automatically calculate the interface cost according to the bandwidth

This command is used to set the overload flag bit of non-pseudo-node LSP

This command allows the device to set the time for the system to maintain the overload flag according to the state of BGP convergence

This command is used to specify that the Hello message sent after the device restarts carries the SA bit

43. Which of the following prefix lists can match any routing entry except the default route?

ip ip-prefix huawei index 10 deny 0.0.0.0 0 less equal 32 Ip ip-prefix huawei index 20 permit 0.0.0.0 0

ip ip-prefix huawei index 10 deny 0.0.0.0 0 Ip ip-prefir huawei index 20 permit 0.0.0.0 0 less-equal 32

ip ip-prefix huawei index 10 permit 0.0.0.0 0 Ip ip-prefix huawei index 20 deny 0.0.0.0 0 less-equal 32

ip ip-prefix huawei index 10 permit 0.0.0.0 0 less-equal 32 Ip ip-prefix huawei index 20 deny 0.0.0.0 0

ip ip-prefix huawei index 10 permit 0.0.0.0 0 less-equal 32

ip ip-prefix huawei index 10 deny 0.0.0.0 0

44. What is the minimum total length of the address in IS-IS Byte?

45. Which of the following descriptions about BGP route optimization is correct?

When BGP selects a route, if it cannot be optimized according to the conditions, it will automatically carry out load sharing

When there are multiple effective routes in BGP, BGP Speaker only advertises the optimal route to the peer

When BGP receives multiple routes to the same destination, it will select the optimal route according to the routing rules, and then deliver the optimal route to the IP routing table to guide data traffic forwarding

BGP compares the originality of routes strictly according to the sequence when selecting routes. If the optimal route can be selected through the previous attributes, the latter comparison cannot be judged.

46. Which of the following does not belong to IGP?

RIP

IS-IS

BGP

OSPF

47. When using routing policy for routing filtering, which routing prefixes in the following options will be denied when matching the following IP-Prefix? (Multiple choice)

[HUAWEI] ip ip-prefix aa index 10 deny 0.0.0.0 24 less-equal 32

[HUAWEI] ip ip-prefix aa index 20 permit 0.0.0.0 0 less-equal 32

1.1.1.1/26

1.1.1.2/16

1.1.1.1/32

1.1.1.1/24

48. Which of the following descriptions about OSPF packet authentication is incorrect?

OSPF message authentication will encrypt OSPF messages to ensure their security and confidentiality.

The router supports two OSPF packet authentication methods: interface authentication and area authentication. When both authentication methods exist, the interface authentication method is used first.

In OSPF interface authentication mode, the authentication mode and password of the directly connected interface of the adjacent router must be consistent.

After OSPF enables packet authentication, only OSPF packets that pass authentication can be received.

49. Which of the following descriptions of the BFD session establishment method is incorrect?

Static configuration of a BFD session refers to manually configuring BFD session parameters through the command line, including local identifiers, remote identifiers, etc.

The system distinguishes between static BFD sessions and dynamic BFD sessions by configuring local and remote identifiers.

When dynamically establishing a BFD session, the system will dynamically allocate a local identifier.

When detecting a network that uses static routing to achieve Layer 3 interoperability, BFD sessions can only be established dynamically.

50. Among the following VPN technologies, which one is likely to cause two IP packet headers in one packet? (Multiple choice)

L2TP

SSL VPN

GRE

IPsec VPN

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51. Which BGP route will send BGP neighbors without BGP path load sharing enabled?

All BGP routes learned from all neighbors

Only the best route preferred by BGP

Only routes learned from IBGP

Only routes learned from EBGP

52. BGP neighbor is a neighbor relationship established through UDP.

TRUE

FALSE

53. Drag and drop question: In the WLAN three-layer networking scenario, the AP will go through the following stages when going online. Please sort them in order.

AP discovers AC through option 43

AP and AC establish CAP7AP tunnel

The AP goes online and the AC delivers the service configuration to the A

AP obtains IP address

54. The Next_Hop attribute in BGP records the next hop of a route. Similar to the next hop in an IGP, the Next_Hop attribute in BGP must be the IP address of a peer interface.

TRUE

FALSE

55. Which of the following descriptions of different types of firewalls are correct? (Multiple choice)

The stateful inspection firewall security policy checks that the source and destination IP addresses comply with the policy to create stateful entries.

The stateful inspection firewall only performs security policy inspection on the first packet that does not hit the session.

Apply proxy firewall to proxy services between internal network and external network users

By default, the packet filtering firewall performs ACL matching checks on every data packet passing through the firewall.

56. Which of the following descriptions of the Backup status in the VRRP protocol are correct? (Multiple choice)

Backup device does not respond to ARP requests for virtual IP addresses

When the Backup device receives the VRRP message from the Master device, it does not perform any processing.

When the Backup device receives a VRRP packet with a priority of 0, it will immediately switch to the Master device.

The Backup device does not process packets whose destination IP address is a virtual IP address.

57. Which of the following descriptions about IGMPv1 and IGMPv2 are correct? (Multiple choice)

IGMPv1 supports general group query

IGMPv2 message types include member leaving messages

The IGMPv1 message type does not include the member leave message

IGMPv2 does not support group-specific queries

58. Check the IGMP configuration of the interface on the router RTA as follows.

Which statement about the RTA running information is wrong?

The interface IP address is 192.168.1.1

The maximum response time for query messages is 10 seconds

The interval between query messages for a specific group is 60 seconds.

IGMP protocol version is 2

59. After the stack is split, the party that loses the MAD election will be in the __.

60. Which of the following BGP path attributes are optional transition attributes? (Multiple choice)

Aggregator

MED

Community

Cluster-List

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61. Which of the following characteristics does the IS-IS protocol have? (Multiple choice)

Better scalability

Suitable for large-capacity routing delivery

The bottom layer is the data link layer

Does not support network element hierarchical division

62. Generally, an interface only needs to be configured with one primary IP address, but in some special cases, a secondary IP address needs to be configured.

Which of the following options is the maximum number of addresses that can be configured for each Layer 3 interface?

63. When roaming is configured on a WLAN, which of the following factors may cause inter-AC roaming failure? (Multiple choice)

The names of roaming groups between ACs are inconsistent

When configuring the roaming group, the AC does not configure the CAPWAP source address

The two APs implementing WLAN roaming are not configured with the same security profile name

Enable the dual-link hot backup function

64. On an IS-IS network, each router can generate LSPs.

Which of the following events trigger the generation of a new LSP?

Related IS-IS interfaces go up or down.

Periodic updates occur.

Inter-area IP routes change.

The IS-IS interface cost is increased.

65. Which of the following descriptions about IGMPv3 are correct? (Multiple choice)

The query packets in IGMPv3 not only include general group query packets and specific group query packets, but also add specific source group query packets

IGMPv3 provides the ability to carry multicast source information in the message, helping the host to select the multicast source

In IGIPv3, a member report message can carry multiple multicast group information

IGMPv3 defines a special member leaving message, which can quickly confirm whether the member of the corresponding multicast group has left

66. RSTP provides different functions in different scenarios.

Which of the following statements Is false?

After TC-BPDU attack defense function is enabled, you can set the number of times the switch processes TC BPDUs within a certain period

The role of the designated port that is enabled with root protection cannot be changed

If the edge port on the switch enabled with BPDU protection receives RST BPDU, the switch sets the edge port as a non-edge-port and triggers STP calculation

When the designated port enabled with root protection receives optimal RST BPDUs, the port enters the Discarding state and does not forward packets. If the port does not receive optimal RST BPDUs within a certain period of time, the port will automatically restore to the Forwarding state

67. Which of the following are the advantages of electing DR/BDR in the MA network? (Multiple choice)

Facilitate synchronization of link status

No multicast packets are needed to maintain neighbor status

OSPF neighbor can be established as long as TCP is reachable

Reduce duplicate traffic

68. As shown in the figure, it is a multicast network.

Which of the following ports are multicast group member ports? (Multiple choice)

IF4

IF3

IF1

IF2

69. Part of the configuration of a router is shown in the figure, so which of the following descriptions about this part of the configuration is correct?

[HUAWEI] ip ip-prefix plpermit 10.0.192.0 8 greater-equal 17 less-equal 18

In the 10.0.192.0/8 network segment, the route with a mask length of 19 will match the prefix list, and the matching rule is allowed

In the 10.0.192.0/8 network segment, the route with a mask length of 21 will match the prefix list, and the matching rule is allowed

In the 10.0.192.0/8 network segment, the route with a mask length of 18 will match the prefix list, and the matching rule is allowed

In the 10.0.192.0/8 network segment, the route with a mask length of 20 will match the prefix list, and the matching rule is allowed

70. To modify the OSPF network type of the interface under the interface, you need to restart the device or reset ospf. Otherwise ospf will not take effect.

TRUE

FALSE

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71. Rapid detection technology can detect communication failures with adjacent devices as early as possible so that the system can take timely measures to ensure uninterrupted business.

TRUE

FALSE

72. The ABR in the NSSA area will not flood Type 4 and Type 5 LSAs to NSSA, but will flood Type 7 LSAs to other areas.

TRUE

FALSE

73. Which of the description about VRRP is wrong?

The routers in the VRRP group elect the Master according to the priority

If the Master router fails, the Backup router in the virtual router will re-elect a new Master according to the priority

Because the priority range is 1-255, when the priority value in the VRRP notification message received by the Backup device is 0, the Backup will discard the message without any processing

The Master router notifies the device or host connected to it of its virtual MAC address by sending a gratuitous ARP message

74. There can be multiple nodes under one Route-Policy, and the device starts matching in order when calling Route-Policy.

TRUE

FALSE

75. Which of the following route types can be introduced by OSPF? (Multiple choice)

Static routing

Direct routing

IS-IS

BGP

An OSPF instance different from itself

76. Please match the following VRRP status with the corresponding working mechanism

77. Which of the following IP address ranges are not multicast address ranges? (Multiple choice)

192.168.0.0~192.168.255.255

239.0.0.0~239.255.255.255

168.1.0.0~168.1.255.255

224.0.0.0~ 224.0.0.255

78. OSPF is deployed in a campus to achieve network interoperability, and OSPF is also enabled on the GE0/0/2 interface of R3. Area1 is deployed as an NSSA area, and the addresses of each device are as shown in the figure.

An engineer configured a static route on R3 to access the loopback interface address of R4, and imported the static route into the OSPF process. At this time, in the Type5 LSA received by R1, the forwarding address (FA) is:

79. The comparison items of the master switch election in the stack include? (Multiple choice)

Running status

Stack ID

MAC address

Stack priority

80. As shown in the figure, three first-level switches are interconnected with one HUB. The STP function is enabled on all switches. Please refer to the figure below for the STP bridge ID setting of the switch. Others are default configurations.

Which option in the following description is incorrect?

Both ports of SWA are designated ports and are in forwarding state.

The G0/0/1 port of SWC is an Alternate port and is in a blocked state.

The G0/0/2 port of SWA is blocked.

SWA is the root bridge in this simple network

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81. BGP is generally applied to complex networks where routes change frequently. Frequent route flapping consumes a large number of bandwidth and CPU resources, and even affects the normal operation of the network. This is an unavoidable problem that cannot be solved in BGP.

TRUE

FALSE

82. If the interval for two consecutive packets of a TCP session reaching the firewall is longer than the aging time of the session, the firewall deletes the session information from the session table to ensure network security.

TRUE

FALSE

83. Compared with STP, RSTP defines the different port states.

Which of the following statements regarding discarding and learning states are true?

The port In discarding or learning state does not forward data frames.

The port in discarding state does not learn MAC addresses table.

The port in discarding or learning state does not learn MAC addresses

The port In learning stole docs not learn MAC addresses table.

84. Regarding LSA3, LSA4 and LSA5, which of the following description is correct?

LSA5 will not change after passing through different areas, but LSA3 will change

LSA3, LSA4 and LSA5 will not change after passing through different areas

LSA3 will not change after passing through different areas, but LSA4 and LSA5 will change

LSA4 will not change after passing through different areas, but LSA3 and LSA5 will change

85. In IGMPv2, the querier can send query messages to a specified multicast group in the shared network segment to query whether there are members in the multicast group.

TRUE

FALSE

86. Compared with RSTP, which of the following port roles are added to MSTP?

Backup port

Master port

Edge port

Regional edge port

87. If a router ID is configured in both the system via and the BGP view, BGP uses the router ID configured in the BGP view because the BGP view takes precedence over the system view.

TRUE

FALSE

88. When two BGP peers support different Hold Time, they will negotiate to support the shortest Hold Time interval they can support.

TRUE

FALSE

89. When the IPv6 address of the host is configured in the stateless address configuration method, and other parameters except the address are obtained through DHCPv6, how to set the M bit and 0 bit in the RA message?

M=0 0=0

M=1 0=0

M=1 0=1

M=0 0=1

90. Different packets need to be used in the process of establishing OPSF adjacency relationships, so please associate the following states with the packets used in that state.

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91. In special scenarios, when advertising routes to an IBGP peer, a BGP device needs to set the next hop to its IP address to prevent blackhole routes.

Which of the following commands can be run in this case?

peer next-hop-local

peer mpls-local-ifnet

peer private-nexthop

peer next-hop-invariable

92. Huawei's CloudCampus solution supports the business mobility function, which can be configured through graphical policies to enable users to access it anytime and anywhere.

TRUE

FALSE

93. In route-policy, what are the BGP attributes that can be used in the apply clause? (Multiple choice)

MED

AS-Path

Tag

Local-Preference

94. Which of the following statement about OSPF neighbor information is wrong?

The router id of the neighbor is 2.2.2.2

This router is the Master

The address of DR is 10.1.1.1

The router id of this router is 1.1.1.1

95. Which of the following descriptions of multicast MAC addresses are incorrect? (Multiple choice)

The function of the multicast MAC address is to identify receivers belonging to the same multicast group on the link layer.

One multicast IP address can correspond to multiple multicast MAC addresses.

The high 24 bits of the multicast MAC address are 0x01005e, the 25th bit is fixed to 1, and the low 23 bits of the MAC address are the low 23 bits of the multicast IP address.

One multicast MAC address can correspond to multiple multicast IP addresses.

96. On an OSPF network, one router with P2P as the network type is directly connected to another router with P2MP as the network type. If the Hello intervals on the two routers are changed to be the same, neighbor relationship establishment and LSDB synchronization are not affected.

TRUE

FALSE

97. In inter-zone packet filtering, which of the following traffic directions belongs to the outbound direction?

Trust->Local

Trust->Untrust

Untrust->DMZ

Untrust->Trust

98. When performing source NAT configuration and having no-pat configuration parameters, which of the following statements is correct?

Only the destination IP address is translated

Simultaneous source IP address and source port translation

Only source IP address translation is performed

Perform destination IP address and destination port translation

99. Which of the following fields is not included in the LS Request message?

Advertising Router

Link State ID

Database Description Sequence Number

Link state type

100. An enterprise administrator views the following details about a BGP route during routine O&M:

yaml

CopyEdit

display bgp routing-table 192.168.1.1

BGP local router ID: 10.1.1.1

Local AS number: 100

Paths: 2 available, 0 best, 0 select

BGP routing table entry information of 192.168.1.1/32:

From: 10.1.1.2 (10.1.1.2)

Route Duration: 00h01m31s

Relay IP Nexthop: 0.0.0.0

Relay IP Out-Interface: --

Original nexthop: 172.16.1.2

AS-path: 200, origin incomplete, MED 0, localpref 100, pref-val 0, internal, pre 255, invalid for IP unreachable

Not advertised to any peer yet

Which of the following statements are true about the BGP route?

The original next hop of the route is 172.16.1.2.

The local BGP router ID is 10.1.1.1.

The local AS number is 100.

The route is preferentially selected because its Local_Pref has a higher priority.

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101. RTA is the source DR router, and RIB is the RP router. The multicast source sends group blessing data to RTA, but the group blessing source Source registered with it through the PIM Register message cannot be seen on the RIB. The possible reasons are as follows: (Multiple choice)

There is no single-finger route from RTB to RTA, which causes RIB to fail the RPF check of the source

The multicast network dynamically elects RP, but RTA fails to check the RPF of BSR

The RP elected by RTA is not RTB

The multicast network is statically configured with RP, but the RTA router is not statically configured with RP

102. Which of the following statements about IGMPv2 routers maintaining segment group membership are correct? (Multiple choice)

After receiving the Leave message, the router immediately removes the members of the group

The router queries for a specific group

The router maintains a timeout timer for each group membership

After the router sends a general group query message, all receivers need to respond within the maximum response time

103. Which of the following descriptions about CloudFabric intelligent operation and maintenance is wrong?

CloudFabric intelligent operation and maintenance can actively operate and maintain, and automatically troubleshoot

CloudFabric intelligent operation and maintenance uses SNMP protocol to realize automatic operation and maintenance

CloudFabric intelligent operation and maintenance can realize second-level data collection through Telemetry

CloudFabric intelligent operation and maintenance is business-centric

104. BGP uses which of the following messages to exchange routing information between peers?

Open

Keepalive

Update

Route-refresh

105. Which of the following scenarios is not suitable for deploying interface PBR?

A core switch needs to forward traffic between the intranet and extranet to an AC device that connects to the core switch in off-path mode.

A core switch needs to forward the traffic between the intranet and extranet to a security detection device that connects to the core switch in off-path mode.

A device needs to modify the next-hop IP address for locally originated traffic.

On an enterprise network with multiple ISP outbound interfaces, each internal network segment accesses the Internet through a particular ISP outbound interface.

106. When configuring dual-link hot backup in a WLAN network, the larger the value of the configured AC priority, the higher the actual priority of the AC.

TRUE

FALSE

107. A campus network uses OSPF for network communication.

The display ospf peer command is run on a router, and the command output is as follows:

vbnet

Copy

Edit

display ospf peer

OSPF Process 1 with Router ID 10.0.2.2

Area 0.0.0.0 interface 10.0.235.2 (GigabitEthernet0/0/1)'s neighbors

Router ID: 10.0.5.5 Address: 10.0.235.5

State: Full Mode: Nbr is Master Priority: 1

DR: 10.0.235.5 BDR: 10.0.235.3 MTU: 0

Dead timer due in 40 sec

Area 0.0.0.0 interface 10.0.24.2 (Serial1/0/1)'s neighbors

Router ID: 10.0.4.4 Address: 10.0.24.4

State: Full Mode: Nbr is Master Priority: 1

DR: None BDR: None MTU: 0

Dead timer due in 35 sec

Which of the following statements are true about the device?

The IP address of the DR on the network where R2 and its neighbor 10.0.5.5 reside is 10.0.235.5.

R2 has established adjacencies with 10.0.5.5 and 10.0.4.4.

The DR/BDR election fails on the network where R2 and its neighbor 10.0.4.4 reside.

Router IDs of the two OSPF neighbors of R2 are 10.0.5.5 and 10.0.4.4.

108. Please match the following BGP-recognized community attribute names with their corresponding functions.

109. In PIM-SM, which of the following descriptions about RP is incorrect?

In PIM-SM, multicast data traffic does not necessarily have to be forwarded through RF

For a multicast group, there can be multiple RP addresses at the same time to improve network reliability.

In a multicast network, multiple C-RPs can exist at the same time to improve the high availability of the R

All multicast streams in the shared tree are forwarded to the receiver through the R

In EPIM-SM, different RP addresses can be configured for different multicast groups to achieve traffic load sharing.

110. In the RSTP network shown in the figure, according to the configuration of SWC in the figure, it can be judged that the type of E0/1 port of SWC is? (Multiple choice)

Edge port

Preliminary port

Designated port

Root port

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111. Which of the following routing protocols support publishing default routes through command configuration? (Multiple choice)

BGP

IGMP

ISIS

OSPF

112. Regarding the LSA age field, which description is correct? (Multiple choice)

The unit of LSA age is seconds, and the LS age of LSA in LSDB increases with time

If the LS age of an LSA reaches LSRefreshTime (30min), the producer of this LSA needs to regenerate an instance of the LSA

The unit of LSA age is seconds, and the LS age of LSA in LSDB decreases with time

If the LS age of an LSA reaches LSRefreshTime (30min), any router can regenerate an instance of this LSA for this LSA

113. How long is the default lease period of the DHCP address pool?

1 month

1 hour

1 week

1 day

114. Which of the following is used as the destination port for single-hop BFD?

UDP port 3784

UDP port 4784

TCP port 3784

TCP port 4784

115. BGP protocol uses () message to revoke routing entries.

116. Which of the following statements regarding the LSA age field are true?

The unit of this field is seconds. In a LSDB, the LS age of a LSA increases with time.

If the LS age of a LSA has reached the LSRefreshTime (30 minutes), any router can regenerate an instance of this LSA again.

The unit of this field is seconds. In a LSDB, the LS age of a LSA decreases with time.

If the LS age of a LSA has reached the LSRefreshTime (30 minutes), the originator of this LSA needs to regenerate an instance of this LSA again.

117. Which of the following OSP F messages carries

master-slave relationship information?

LSA Update message

LSA Request message

DD message

Hello message

118. Please pair the following hardware modules with the corresponding functions.

119. Please compress the address 2001:0DB8:0000:C030:0000:0000:09A0:CDEF. ()

120. When there are multiple routes with different Origin attributes to the same destination, and other conditions are the same, BGP will prioritize the route in the order of Origin attributes. Please sort the following Origin attributes in order of priority.

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121. Which of the following statements regarding OSPF route summarization commands are true?

The asbr-summary command is executed in the OSPF view.

The abr-summary command is executed in the OSPF area view.

Advertise is the default parameter of the abr-summary command. That is, if not-advertise is not specified in the abr-summary command, the advertise parameter takes effect by default.

Not-advertise is the default parameter of the abr-summary command. That is, if advertise is not specified in the abr-summary command, the not-advertise parameter takes effect by default.

122. Among the following security zones, which one is not the default security zone deployed by the USG series firewall?

Outside

DMZ

Trust

Local

123. Which of the following statements about stack split is false?

After a stack splits, the MAC addresses of the two stacks change immediately.

If the master and standby switches are still in the same stack after the stack splits, the slave switches separated from the original master and standby switches re-elect the master and standby switches due to protocol packet timeout.

If the master and standby switches are in two stacks after the split, the stack where the original master switch resides updates the topology and selects a new standby switch. The original standby switch becomes the master switch in the new stack and a new standby switch is elected.

After a stack splits, multiple stacks have the same IP address and MAC address. To prevent network faults, the stacks perform MAD detection. The stack that fails the MAD detection shuts down all physical ports except reserved ports.

124. In IPsec, which protocol can be used to achieve data integrity?

AES

3DES

MD5

DES

125. Which of the following descriptions of MAC address spoofing attacks is incorrect?

MAC address spoofing attacks will cause the switch to learn the wrong mapping relationship between MAC addresses and IP addresses.

A MAC address spoofing attack will cause the data that the switch wants to send to the correct destination to be sent to the attacker.

MAC address spoofing attacks mainly utilize the switch MAC address learning mechanism.

An attacker can implement a MAC address spoofing attack by sending a data frame with a forged source MAC address to the switch.

126. During daily troubleshooting, engineers may need to check some alarm information of the equipment. Run the termina10 command to open the terminal display debugging/log/alarm information function sent by the information center.

127. The following is part of the output information of the router RTB.

Which is the wrong description of the output information?

The host to send the last Report message is 225.1.1.2

The number of dynamically joined multicast groups on the interface is 1

The display igmp group command is used to view IGMP multicast information, including the information of the multicast group dynamically joined through the member report and the multicast group statically joined through the command line

The joined multicast address is 255.1.1.2

128. Which of the following events will cause IS-IS to generate a new LSP? (Multiple choice)

Adjacency Up or Down

The imported IP route sends changes

Periodic updates

The interface overhead has changed

129. What are the benefits of OSPF area division? (Multiple choice)

Routers in an area can learn topology details outside their area

Can reduce the size of LSDB and thus reduce the consumption of router memory

LSA can also be reduced with the division of areas, reducing the consumption of router CPU

Mass flooding of LSAs is limited to a single area

130. As shown in the figure, the user has configured the relevant parameters of the VRRP backup group, and the parameters that are not shown remain in the default state.

R3 with priority 240 is now added to the VRRP backup group.

Which of the following descriptions are correct? (Multiple choice)

R2 is still a Backup device

R3 will become a Backup device

R1 will switch to Backup device

R1 is still the Master device

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131. STP ensures a loop-free network but has a slow network topology convergence speed, affecting communication quality. RSTP has made some improvements based on STP.

Which of the following improvements is not included?

If a port does not receive configuration BPDUs from the upstream device within four Hello intervals, the switch considers that the negotiation with the neighbor fails.

The non-root switch running RSTP sends configuration BPDUs at the interval specified by the Hello timer, which is performed independently by each device.

RSTP reduces five port states to three port states based on user traffic forwarding and MAC address learning.

RSTP deletes three port states and adds two port roles.

132. ON a stateful inspection Firewall where there is no session table, when the status detection mechanism is enabled and the second packet (CYN+ACK) of 3-way hadshakes reaches the firewall.

Which of the following statements is true?

If the firewall security policy permits packets to pass, the session table is created.

By default, when status detection is disabled and the permit policy is configured packets can pass.

Packets must pass the firewall, and a session table is established.

If the firewall security policy permits packets to pass, the packets can pass the firewall.

133. STAs stay on different subnets before and after Layer 3 roaming. To enable the STAs to access the original network after roaming, network engineers need to configure user traffic to be forwarded to the original subnet over a CAPWAP tunnel.

TRUE

FALSE

134. Which of the following description of the information contained in the OPEN message in EGP is wrong?

The OPEN message contains the local AS number information

VERSION information is included in the OPEN message

The OPEN message contains the Hold time message

The OPEN message only contains the BGP message header

135. Multiple bare spanning trees can be generated in an MST domain, and each spanning tree is called an MSTI. MSTI uses Instance ID identification, and the value of Huawei equipment is 0~32768.

TRUE

FLASE

136. Routes are imported into BGP through the import-route command.

Which of the following descriptions is correct?

The import-route command can only import IGP routes and static routes into BGP

By default, the Origin value of imported routes is IGP

When the imported routing protocol is ISIS, the process number must be specified

import-route cannot cooperate with route-policy to filter routes imported into BGP by other routing protocols

137. The ABR of the OSPF complete stub area does not flood the third, fourth and fifth type LSAs to the area. Therefore, the ABR of the complete stub area needs to manually delegate a default route to the area to guide the data packets how to reach outside the AS. destination.

TRUE

FALSE

138. In BGP routing rules, routes with higher MED values are given priority.

TRUE

FALSE

139. On the VRP platform, when we introduce IS-IS routing into the OSPF protocol, if COST is not specified, the cost value will be set to 20 by default.

TRUE

FALSE

140. The advantage of IS-IS messages using the TLV structure is that it has better scalability. To add new features, you only need to add a new TLV, and there is no need to change the overall structure of the entire message.

TRUE

FALSE

Page 15 of 38

141. The function of Hello message in PIM-SM is? (Multiple choice)

Neighbor capability negotiation

Establish and maintain neighbor relationships

Election network segment BDR

142. Which of the following descriptions about ASPF and Server-map is correct?

After the message hits the Server-map table, it needs to be controlled by the security policy

When the firewall receives the message, it will check whether it matches the Server-map table

The session table is a concrete reflection of the connection status of the two parties in the communication

The Server-map table is generated by the firewall based on the session table

143. By default, when IS-IS is configured on a device, the minimum time it takes to sense a neighbor failure is seconds. However, after being associated with BFD, BFD can replace the Hello mechanism of the IS-IS protocol, thereby reducing the time it takes to sense a neighbor failure to as little as seconds. Millisecond level.

TRUE

FALSE

144. The following is part of the output information of the router Huawei.

Regarding the output information, the wrong description is:

The router gigabitethernet 1/0/0 interface runs PIM-SM

The PIM status of the router gigabitethernet 1/0/0 interface is UP

The router gigabitethernet 1/0/0 interface runs PIMv2

The DR on this interface is 10.1.1.1

145. Which of the following descriptions about IGMP Proxy are correct? (Multiple choice)

IGMP Proxy can be deployed on a Layer 2 device between the IGMP querier and member hosts

The IGMP Proxy function cannot reduce the number of IGMP member leave messages received by the IGMP querier

The IGMP Proxy function can reduce the number of IGMP membership reports received by the IGMP querier

IGMP Proxy cannot be deployed on a Layer 3 device between the IGMP querier and member hosts

146. As shown in the figure, R1 and R2 are VRRP backup groups with VRID, where the State of R1 is ________, and the State of R2 is ________.

147. An ACL can be used to match routes or data, but cannot be used to match both the IP address prefix length and mask length.

TRUE

FALSE

148. All single switches in the stack system are called member switches and can be divided into different roles according to their functions. Please match the roles of the following member switches with their functions.

信件

中度可信度描述已自动生成

149. See the following figure. All routers on the network run IS-IS and are in area 49.0001.

By referring to the LSDB of R1, the Level-2 DIS is. (Enter the device name, for example, R1.)

150. In the RSTP protocol, when the network topology changes, the mechanism to respond to the topology change is:

Whole network flooding

Modify the lifetime of the MAC address table

Partially delete the MAC address table

Delete the entire MAC address table

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151. Which of the following descriptions about MP-BGP is wrong?

A router that supports MP-BGP cannot interact with a router that only supports BGP-4

MP-BGP can isolate the routing information of different address clusters from each other

MP-BGP introduces two new optional non-transition path attributes: MP_REACH_NLRI and MP_UNREACH_NLRI

MP-BGP can carry multiple network layer protocols

152. On the OSPF network shown in the figure, an adjacency has been established between R1 and R2. An engineer configures the commands in the figure on R2.

In this case, which of the following routing entries may exist in the routing table of R2?

10.1.4.0/24

10.1.3.0/24

10.1.2.0/24

10.1.1.0/24

153. In the VRP system, which of the following commands can enable the OSPF router to generate a default route?

default-route-initiate

default information-originate

ospf default-route

default-route-advertise

154. In BGP route selection rules, routes with high Local_Pref values take precedence.

TRUE

FALSE

155. IGMP SSM Mapping statically binds the multicast source to the multicast group, so that group members of IGMPv1 and IGMPv2 can also access the SSM multicast network.

Which of the following descriptions about IGMP SSM Mapping is wrong?

IGMP SSM Mapping does not process IGMPv3 report messages. In order to ensure that hosts running any version of IGMP on the same network segment can get SSM services, it is necessary to run IGMPv3 on the multicast router interface connected to the network segment where the member hosts are located.

Statically configure the mapping rules of the SSM address on the IGMP querier, and map the group joining information in the IGMPv1 or IGMPv2 member report to the group leaving information

The address of the multicast group of SSM is 232.0.0.0~232.255.255.255

If the IGMP SSM Mapping function is not enabled, neither IGMPv1 nor IGMPv2 support the deployment of multicast in SSM mode

156. BFD detection can be linked with which of the following modules to speed up fault detection? (Multiple choice)

BGP

Static routing

VRRP

OSPF

157. When a routing policy is used to filter routes, which of the following route prefixes will be denied by the IP prefix below?

[HUAWEI] ip ip-prefix aa index 10 permit 1.1.1.1 24 greater-equal 25 less-equal 32

1.1.1.1/26

1.1.1.2/16

1.1.1.1/32

1.1.1.1/24

158. Which of the following descriptions about the default sending time interval of BFD detection packets is correct?

The default sending interval is 5 milliseconds

The default sending interval is 1000 milliseconds

The default sending interval is 100 milliseconds

The default sending interval is 10 milliseconds

159. In the VRP system, by default, BGP will automatically aggregate imported routes.

TRUE

FALSE

160. Which of the following statements regarding Local-Preference in BGP is true?

Local-Preference affects traffic that enters an A

Local-Preference can be transmitted between ASs.

The default Local-Preference value is 100.

Local-Preference is a well-known mandatory attribute.

Page 17 of 38

161. Regarding the routers that can initiate SPT switching in the PIM-SM network, what is the wrong description? (Multiple choice)

Intermediate router

RP router

Source DR router

Last hop router

162. The IP protocol number of the VRRP message is:

116

114

112

118

163. As shown in the figure, all routers run IS-IS. R3 is a Level-1 router, R6 is a Level1-2 router, and other routers are Level-1-2 routers.

What are the types of neighbor relationships between routers?

164. Execute the () saved-configuration command to clear the contents of the configuration file used for the next startup of the device, and unspecify the configuration file used for the next startup of the system, thereby restoring the device configuration to the default value.

165. A large shopping mall configures a VLAN pool to prevent network performance deterioration caused by potentially large broadcast domains. A network engineer runs the display vlan pool name STA command to check information about the VLAN pool.

The following command output is displayed:

display vlan pool name STA Name: STA Total: 2

Assignment: hash Threshold Notify Count: 3

Threshold Notify time(min): 3 VLAN ID: 2 4

Which of the following statements are true?

The VLANs with the IDs of 2 and 4 are added to the VLAN pool.

The total number of VLAN pools is 2.

The name of the VLAN pool is ST

The VLAN pool uses the even VLAN assignment algorithm.

166. After receiving the service packet, the modular switch first processes it through the uplink interface board, then processes it through the downlink interface board, and finally sends it out through the interface.

TRUE

FALSE

167. Which of the following descriptions about the Cluster List attribute in BGP is wrong?

When RR receives a BGP route carrying the Cluster_List attribute, and the attribute value contains the Cluster_ID of the cluster, RR considers that there is a loop in this route, so it will ignore the update about this route

The attribute is an optional transition type

Cluster_List is generated by the route reflector, which consists of a series of Cluster_ID

When a route is reflected by the reflector, the Cluster_ID of the RR will be added to the Cluster_List attribute of the route

168. An IS-IS router with an interface priority of 0 cannot participate in DIS election.

TRUE

FALSE

169. Which of the following descriptions of wildcard masks is correct?

The wildcard mask can be directly derived from the inversion of the binary subnet mask.

In the wildcard mask, 0.0.0.0 represents all IP addresses

The wildcard mask must consist of consecutive "1" and "0" from left to right, and consecutive "1"s cannot be separated by "0"

In the wildcard mask, setting the mask to "0" means that the corresponding bits in the IP address must match exactly.

170. Which of the following statement regarding the display ospf peer command output is true?

Address: 10.1,1.1 Indicates that the local interface address is 10.1.1.1.

Through negotiation during DD packet exchange, the local end becomes the slave.

Router ID indicates that the local router ID Is 10.1.1.1.

The DR address is 10.1.1.1

Page 18 of 38

171. By default, how many seconds is the BCP peer adjacency relationship maintained?

120 seconds

60 seconds

10 seconds

180 seconds

172. There are hosts running various IGP versions in the current network. The corresponding S multicast group address ranges of hosts of different versions are different. But its function is to receive multicast information from the specified source.

TRUE

FALSE

173. RPF has the function of preventing loops in multicast.

TRUE

FALSE

174. If two Huawei routers establish a BFD session, the sending interval of AR1 is 50 milliseconds and the receiving interval is 80 milliseconds; the sending interval of AR2 is 60 milliseconds and the receiving interval is 90 milliseconds, so which of the following descriptions of the post-negotiation time interval is correct?

After negotiation, AR1 has a sending interval of 50 milliseconds and a receiving interval of 80 milliseconds.

After negotiation, the sending interval of AR2 is 80 milliseconds and the receiving interval is 90 milliseconds.

After negotiation, the sending interval of AR2 is 90 milliseconds and the receiving interval is 80 milliseconds.

AR1 has a sending interval of 60 milliseconds and a receiving interval of 90 milliseconds after negotiation.

175. The following is the output information of a router.

Which is the correct description of this information?

The community attribute value carried by the destination network segment 1.1.1.0/24 is no-export, indicating that the routing entry cannot be advertised to any BGP neighbors

The community attribute value carried by the destination network segment 5.1.1.0/24 is no-advertise, indicating that the routing entry cannot be advertised to any other BGP peers

The community attribute value carried by the destination network segment 1.1.1.0/24 is no-export, indicating that the routing entry can be advertised to any BGP neighbor

The community attribute value carried by the destination network segment 5.1.1.0/24 is no-advertise, indicating that the routing entry cannot be advertised outside the local AS

176. If

aBGPdevice is configured withthe ip as-path-filter 1 permit

^12. *35$command, which of the followingAS_Pathscan be

correctly matched?

AS_Path (123 35 28)

AS Path (35 123 28)

AS_Path (35 28 12)

AS_Path (12 28 35)

177. Which layer of the OSI model does the BGP protocol run on?

Session layer

Application layer

Data link layer

Network layer

178. If IGP routes want to become BGP routes, they can only pass the network command.

TRUE

FALSE

179. Which of the following descriptions of BGP features are correct? (Multiple choice)

Able to carry large amounts of routing information and support large-scale networks

Periodic routing updates

Can support MPLS/VPN applications and deliver customer VPN routes

Use TCP as the transport layer protocol

180. After the stack split occurs, the MAD conflict handling mechanism will conduct MAD competition.

In the principle of MAD competition, within how many seconds is the difference between the startup and completion times of the stack considered to be the same?

5 seconds

20 seconds

15 seconds

10 seconds

Page 19 of 38

181. What are the key components of building an IP wide-area bearer network solution together with Huawei NetEngine intelligent routers?

iMaster NCE-Fabric

iMaster NCE-IP

iMaster NCE-Campus

iMaster NCE-WAN

182. The DHCP relay is responsible for forwarding DHCP messages between the DHCP server and the DHCP client, and assists the DHCP server in dynamically allocating network parameters to the DHCP client.

TRUE

FALSE

183. A non-client is an IBGP peer that functions as neither an RR nor a client. A non-client must establish fully meshed connections with the RR and all the other non-clients.

TRUE

FALSE

184. When two devices with the same priority compete for the Master role at the same time, the device with the interface with the smaller IP address should be selected as the Master device.

TRUE

FALSE

185. Which of the following statements is false, based on the following IGMP information on an interface of RTA?

The interval for sending group-specific Query messages is 60s.

The maximum time for response to Query messages is 10s.

The IP address of the interface is 192.168.1.1.

The IGMP version is IGMPV2.

186. The import route limit command cannot limit the maximum number of external routes that can be imported in an OSPF process.

TRUE

FALSE

187. Both policy routing and routing policies can affect the forwarding process of data packets, but they affect data packets in different ways. Policy routing is policy-based forwarding and is based on the forwarding plane. Routing policies are based on the control plane and serve routing protocols and routing tables.

TRUE

FALSE

188. Which of the following descriptions about OSPF is incorrect?

The Link StateID described in the Type 3 LSA is the Router ID of the AB

Routing information is only allowed to be released between backbone areas and non-backbone areas, and routing information is not allowed to be released directly between non-backbone areas.

Each OSPF router uses only one Router-LSA to describe the local active connection status belonging to a district.

There are four connection types described by Router-LSA, namely P2P, TransNet, StubNet and virtual link.

189. Which of the following descriptions about 0SPF packet authentication is wrong? (Multiple choice)

The authentication modes supported by Huawei routers can be divided into Null, Simple., MD5, and HMAC-MD5 according to different encryption algorithms. Some devices also support HMAC-SHA256

The OSPF neighbor authentication process is completed by exchanging Hello packets

Huawei routers support two authentication methods: area authentication and interface authentication

In the same OSPF process on the same router, if Area 0 uses MD5 authentication, other areas must also use MD5 authentication, but the authentication keys in different areas can be different

190. In the VRP system, Route-Policy can match which of the following parameters? (Multiple choice)

Outbound interface for routing information

Access control list

Prefix list

Routing overhead

Page 20 of 38

191. The ACL configuration on a certain router is shown in the figure, so which of the following items are the addresses that satisfy this condition? (Multiple choice)

10.1.2.1/32

10.1.1.1/32

10.1.3.1/32

10.1.4.1/32

192. In IS-IS, NET can be regarded as a special NSAP address, which means that the transmission protocol is IP. That is, the SEL flag of the NET address is fixed to ().

193. If a new member joins a multicast group in PIM-DM, which of the following descriptions are correct? (Multiple choice)

In PIM-DM mode, after using the "diffusion-pruning" method to establish a multicast distribution tree, the status refresh mechanism prevents the downlink interface from automatically recovering once it is suppressed.

You can use the grafting mechanism to proactively establish a multicast distribution path in reverse direction to help new users receive multicast information.

The multicast network needs to update the multicast distribution tree before it can send multicast data to group members.

In existing networks, the method of waiting for the multicast routing table to time out and then flooding the entire network again is often used to help new users receive multicast information.

194. The administrator received the following requirements to design ip as-path-filter. It needs to be realized that the company headquarters (AS 65001) can accept the route originating from the branch office (AS 65110), and the route must pass through AS65002, then please the following configurations and sequences match.

195. When the MTU of the interconnection interface of two routers in the broadcast network does not match, and the interface is configured with ospf mtu-enablet, which of the description of the state change of the neighbor relationship between the two routers is correct?

The neighbor relationship status of the two devices stays at 2-way

The neighbor relationship between the two devices stays at Exstart

The neighbor relationship between the two devices can enter Full

The neighbor relationship status of the two devices stays in the Init state

196. In the WLAN network, when HSB backup group is enabled, if the AP has gone online on the primary AC and then the AP information is added offline on the backup AC, the AP status on the backup AC will be displayed as fault. At this time, you need to execute the undo hsb enable command in the HSB backup group view of the standby AC to enable the HSB active and standby backup function, and then execute the hsb enable command to enable the HSB active and standby backup function. At this time, the information on the active AC will be backed up to Standby AC to achieve consistent backup of active and standby information. The AP status on the AC will be displayed as standby.

TRUE

FALSE

197. In the network as shown in the figure, which of the following descriptions about R4 preferred routing is correct?

It is impossible to determine. MED cannot be used as a condition for BGP route selection between ASs.

Prefer the route delivered by R3, because the larger the MED value, the better.

Load balancing, because the route MED value received from EBGP will return to the default value

Prefer the route delivered by R2, because the smaller the MED value, the better

198. DRAG DROP

Huawei modular devices have multiple hardware modules that provide different functions. Match the following hardware modules with their functions.

199. Regarding the range of BGP AS numbers, which of the following descriptions are incorrect? (Multiple choice)

When 2-byte AS is supported, the value range of the private AS number is 32768-65535

When 2-byte AS is supported, the value range of the private AS number is 64512-65535

When supporting 2-byte AS, the value range is 0-65535

When 4-byte AS is supported, no new attributes need to be defined

200. In order for indirect EBGP neighbors to be established normally, which of the following configurations must be included? (Multiple choice)

peer ebgp-max-hop

Peer connect-interface

peer ignore

peer as-number

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201. Which of the following descriptions about IGMP Snooping are correct? (Multiple choice)

The IGMP Snooping device monitors the IGMP Leave message and the IGMP Membership Report message to determine whether the port needs to send specific multicast data.

The function of IGMP Snooping is to establish and maintain Layer 3 multicast forwarding entries, and guide multicast data to be forwarded on demand

In IGMP Snooping, you can manually configure member ports

When the router port receives a new general group query, it will refresh the aging timer

202. Regarding BGP Local-Preference, which of the following descriptions are correct? (Multiple choice)

The default value of BGP route Local-Preference is 100

The default value of BGP routing Local-Preference is 0

In the BGP route selection rules, Preferred-value has a higher priority than Local-Preference, that is, Preferred-Value is compared preferentially

In the BGP route selection rules, the priority of MED is higher than that of Local-Preference, that is, priority is given to comparing MED

203. If the Length/Type=O × 8100 of an Ethernet data frame, which of the following options may the data frame be sent from? (Multiple choice)

Switch Trunk type ports

Switch Access: Type of port

Serial interface of the router

Switch Hybrid: type of port

204. As shown in the figure, VRRP is associated with a BFD session. When a backup device detects a fault through BFD, the backup device immediately assumes the master role after the Master_Down_Timer timer expires.

TRUE

FALSE

205. InBGP4+,what

is thenext hop network address fieldcarried bythe

MIP_REACH_NLRI attribute in theUpdatemessage?

Can only be a link-local address

Can be just a link-local address

It can only be a global unicast address

Can carry link local address and global unicast address at the same time

206. Which of the following BGP attributes will not be advertised to neighbors along with BGP Update packets?

Next_Hop

Preferred-Value

Origin

AS_Path

207. Which of the following items are included in the traffic matching conditions of the firewall security policy? (Multiple choice)

Source IP address

Source Safe Area

Packet length

Destination IP address

Application

Destination safe area

208. After a switch is powered on, it joins a running stack system. This behavior is called stack joining.

TRUE

FALSE

209. Which of the following descriptions of link aggregation in LACP mode is correct?

In LACP mode, the devices at both ends of the link send LACP messages to each other.

The number of active ports cannot be set in LACP mode.

In LACP mode, all active interfaces participate in data forwarding and share load traffic.

There can only be a maximum of 4 active ports in LACP mode.

210. In different scenarios, RSTP provides different protection functions.

Which of the following statement is wrong?

After the BPDU protection function is enabled on the switching device, if the edge port receives RST BPDU, the edge port will be set as a non-edge port, and the spanning tree calculation will be performed again

After the anti-TC-BPDU message attack function is enabled, the number of times the switching device processes TC BPDU messages within a unit time is configurable

The designated port with the root protection function enabled, its port role can only remain as the designated port

The designated port with root protection enabled, when the port receives a better RSTBPDU, the port will enter the Discarding state and no longer forward packets. If the port does not receive a better RST BPDU for a period, it will automatically return to the normal Forwarding state

Page 22 of 38

211. Which of the following description about OSPF is correct?

OSPF LSA is regularly updated every 30 minutes

OSPF floods an LSU every 5s

OSPF uses the Bellman-Ford algorithm, and each router runs the algorithm independently

OSPF itself has no confirmation mechanism, so 0SPP relies on the lower layer protocol, namely TCP confirmation.

212. As shown in the figure, router R has static routes to three network segments of Site A, Site B, and Site C respectively. The administrator needs to configure to import the routes of Site A and Site B into the OSPF Domain. Please set the commands for configuring RE are completed below.

1: ______

2: ______

3: ______

213. In OSPF broadcast or NBMA network types, devices with high DR Priority may not necessarily become DR.

TRUE

FALSE

214. Similar to OSPF, the two routers establishing a BGP peer relationship must be directly connected.

TRUE

FALSE

215. The ACL configuration of a router is as shown in the figure.

Based on the content analysis in the figure, which of the following descriptions is correct?

Accessing all hosts in the 10.167.12.0/24 network segment through Telnet from the 192.168.1.0/24 network segment is allowed

Accessing the host at the 10.167.12.1 address through SSH from the 192.168.1.0/24 network segment is denied.

Traffic in this device from the 192.168.1.0/24 network segment to the host address other than 10.167.12.1 is not allowed to pass.

Accessing all hosts in the 10.167.12.0/24 network segment through remote desktop from the 192.168.1.0/24 network segment is allowed

216. A VRRP virtual router is configured with a VRID of 3 and a virtual IP address of 100.1.1.10, so which of the following is the virtual C address?

00-00-5E-00-01-64

00-00-5E-00-01-03

01-00-5E-00-01-64

01-00-5E-00-01-03

217. Which of the following descriptions of the OSPF asbr-summary command is incorrect?

The Asbr-summary command can only take effect when deployed on the ASBRs that need to be aggregated.

The routes summarized using the asbr-summary command will be transmitted within the area as type 5 LS

Routes summarized using the asbr-summary command can be flooded to other areas.

The Asbr-summary command can summarize LSAs aggregated by asbr-summary.

218. Which of the following scenarios is not suitable for deploying interface policy routing?

In the scenario where the enterprise network has multiple ISP egresses, different network segments of the intranet access the Internet through different ISP egresses

Modify the next-hop of traffic originating locally

On the core switch, the mutual access traffic between the internal network and the external network is drawn to the bypass AC device

On the core switch, the mutual access traffic between the internal network and the external network is drawn to the side-mounted security detection device

219. The configuration of the two routers is shown in the figure, and they can establish OSPF adjacency.

TRUE

FALSE

220. As shown in the figure, the IS-IS neighbor relationship is established between the two routers.

Which of the following description about the process of establishing the neighbor relationship is correct? (Multiple choice)

In this broadcast network, R1 and R2 use a three-way handshake to establish an adjacency relationship

In the broadcast network, the DIS needs to be elected. After the adjacency relationship is established, the router will wait for the interval between two Hello messages before electing the DI

R2 marks the adjacency state as Initial after receiving the IIH message sent by R1. Then, R2 replies to R1 with Level-1LANIIH, which identifies R1 as the adjacency of R2

In Down state, R1 unicast sends Level-1LANIIH, and the adjacency list in this message is empty

Page 23 of 38

221. Which of the following statements regarding the firewall zone security level is false?

The configured security level cannot be changed.

Two zones cannot be configured with the same security level.

The default security level of the new zone is 1.

Only the security level of the user-defined zone can be configured.

222. In a large-scale WLAN network, when the VLAN Pool uses HASH to allocate VLANs, the number of users in each VLAN will be evenly divided.

TRUE

FALSE

223. BGP prefers the route with the best Origin attribute value. The Origin attribute value is: EGP, (), Incomplete.

224. Which of the following descriptions about the recognized attributes in BGP are correct? (Multiple choice)

The recognized mandatory attribute is recognized by all BP routers and must exist in the Update message

BGP must recognize all recognized attributes

Recognized attributes are divided into two types: recognized mandatory compliance and optional transition

It is recognized that any attribute can be recognized by all BGP routers, but it is not required to exist in the Update message

225. A certain router runs IS-IS, and its interface output information is as shown in the figure.

QQ图片20240504110328/

Which of the following descriptions is correct?

circuit-levelLevel-1 of the S4/0/0 interface

The S4/0/0 interface sends IIH every 30 seconds.

The Cost value of the S4/0/0 interface is 20

The S4/0/0 interface supports IPv6

226. Which of the following is not a typical module of data center networking?

Server

Data Center Infrastructure

Storage area network

Data Center Network

227. Which of the following descriptions of the different classifications of PBR is correct?

PBR can be divided into interface PBR, local PBR and routing PB

Local PBR is invalid for originating packets and only works for forwarded packets.

Interface PBR can modify the IP-Precedence of IP packets

Interface PBR is called under the interface and takes effect on the outbound packets of the interface.

228. In WLAN networking, backup technologies can be deployed to ensure the reliability of the networking.

Which of the following statements about backup technology is correct? (Multiple choice)

After deploying dual-link hot backup, when the active AC fails, the AP can quickly switch to the standby AC, and the STA does not need to disconnect and reconnect

After deploying dual-link cold backup, when the active AC fails, the AP only needs to wait for a period of time before switching to the standby AC, which will not affect the STA business

After N+1 backup is deployed, when the active AC fails, the AP needs to go online to the standby AC again, and the STA will interrupt the service

After deploying VRP hot backup, when the active AC fails, STA can forward data directly through the standby AC

229. Which of the following descriptions about the OSPF protocol are correct? (Multiple choice)

The cost value of the second type of external route is only the AS external cost value, ignoring the AS internal cost value

AS-External-LSA does not belong to any area

AS-External-LSA describes the flooding scope of the route to the AS external route is outside the AS

AS-External-LSA describes the path from the router to the ASBR

230. IGMP Snooping runs at the data link layer and is used to manage and control multicast groups, and solves the problem of multicast packets being broadcast on Layer 3.

TRUE

FALSE

Page 24 of 38

231. SSH negotiates a variety of algorithms during its implementation.

So which of the following are included in the algorithm categories used by SSH? (Multiple choice)

Shortest Path Algorithm for Determining the Shortest Communication Path

Key exchange algorithm used to generate session keys

Spanning tree algorithm to prevent communication loops

Host public key algorithm for digital signatures and authentication

Algorithm used for data encryption

Algorithms for data integrity protection

232. The relationship between various rules in MQC traffic classification is divided into: and or or, the default relationship is ()

233. LAN mapping table is an attribute of the IST domain and is used to describe the mapping relationship between VLAN and MSTI. Each VLAN can correspond to multiple ISTIs, and one MST can correspond to multiple VLANs.

TRUE

FALSE

234. On a WLAN, the HSB service sets up an HSB channel between two devices that back up each other, maintains the channel status, and backs up data.

Which of the following can HSB back up in real time?

CAPWAP tunnel information

DHCP address information

AP entries

User data information

235. The following is part of the configuration information of the router Huawei.

[HUAWEI] ip as-path-filter 2 permit 200_300

[HUAWEI]route-policy test permit node 10

[HUAWE]-route-policy] if-match as-path-filter 2

Which of the description of the configuration information is wrong?

Define a Route-Policy named test, the node serial number is 10

Set the AS path filter with sequence number 2, allowing routing information to include AS200 and AS300

Node 10 of the Route-Policy references AS path filter 2 and defines an if-match clause

The Route-Policy can only be called in the OSPF process

236. Regarding the description of the firewall security zone, which of the following statements is correct:

Different interfaces of the firewall can belong to the same security zone

The firewall’s built-in security zone can be deleted

Different security zones of the firewall can have the same priority.

The same interface of the firewall can belong to different security zones

237. Which of the following statements about different types of firewalls is wrong?

A stateful inspection firewall needs to be configured with security policies for the "go" and "return" directions of packets

Packet filtering firewall for each data packet passing through the firewall, an ACL matching check is performed

Proxy firewall acts as a proxy for business between internal network and external network users

The state inspection firewall only checks the security policy for the first packet that does not hit the session

238. Which of the following descriptions about the triggering mechanism of 802.1X authentication is correct? (Multiple choice)

The authentication device can trigger authentication in multicast or unicast mode

802.1X authentication can only be initiated by the client

The 802.1X client can trigger authentication by multicast or broadcast

802.1X authentication cannot be initiated by an authentication device (such as an 802.1 switch)

239. If DR Priority is set to 0, then in the OSPF routing domain, the router is allowed to be elected as DR or BDR, but it has the lowest priority.

TRUE

FALSE

240. Which of the following reasons may prevent OSPF neighbor relationships from being established? (Multiple choice)

The two directly connected interfaces use the p2p network type, but the IP packet with the destination IP address 224.0.0.6 is refused to be transmitted.

The dr-priority of the two directly connected interfaces is set to 0.

The two routers are set with different Process IDs

The sending intervals of Hello messages between the two routers are inconsistent.

Two routers are configured with the same Router I

The two directly connected interfaces use different network types.

Page 25 of 38

241. Which of the following statements regarding DR/BDR are false?

In a broadcast network, DR and BDR must be elected. A broadcast network without a DR or BDR cannot operate normally.

DR others listen on the multicast address 224.0.0.5.

All DR others establish neighbor relationships with DR and BDR only.

DR others listen on the network address 224.0.0.6.

242. By default, if no router ID is configured but multiple loopback interface addresses are configured, BGP selects the largest loopback interface address as the router ID.

TRUE

FALSE

243. In the network shown in the figure, all switches run the RSTP protocol.

If the E1 interface of SWB fails, the RSTP processing process: (Multiple choice)

SWB deletes the port entry of the port with the purpose of E1 in the MAC address table

On all non-edge forwarding ports, send a topology change notification (Topology Change notification) to notify other switches that a topology change has occurred in the network

Recalculate the spanning tree, and SWB elects E2 as the new root port

Send topology change notifications (Topology Change notification) on all forwarding ports to notify other switches that topology changes have occurred in the network

244. When the administrator views the RIB table of the device, the OSPF external route should be marked () in the Protocol field.

245. What are the three ways of sending IPV4 packets? (Multiple choice)

Anycast _

Multicast

Unicast

broadcasting

246. As shown in the figure, OSPF is enabled on all interfaces of the router. The cost value of the link is marked in the figure. Interface 0 of R2 Loopback0 is advertised in area 0. In area 1, R2 and R3 will transmit 10.0 in the form of Type3 LSA. 2.2/32 routing information.

TRUE

FALSE

247. In the BGP process, what is the role of the DETAIL-SUPPRESSED option of the AGGREATE command?

Suppress the generated aggregate routes from being delivered to the IP routing table

Suppress the delivery of aggregated detailed routes to the IP routing table

Only advertise aggregated routes to other BGP neighbors

Advertise aggregate routes and detailed routes to other BGP neighbors

248. What functions can Huawei iMaster NCE products achieve? (Multiple choice)

Devices can be managed across manufacturers

Network Automation

Provide a variety of open API interfaces

Predictive Maintenance Based on Big Data and Al

249. Which of the following descriptions about RSTP root protection are correct? (Multiple choice)

The root protection function will take effect when enabled on the root port.

It is recommended to enable it on the switch at the edge of the network

After a port with root protection enabled receives a higher-priority RST BPDU, if it does not continue to receive a higher-priority RST BPDU for a period of time, it will return to the normal forwarding state.

The port with root protection turned on will enter the error-down state after receiving the RST BDPU with a higher priority.

250. OSPF supports multiple processes. Multiple different OSPF processes can run on the same router. They do not affect each other and are independent of each other. The routing interaction between different OSPF processes is equivalent to the routing interaction between different routing protocols.

TRUE

FALSE

Page 26 of 38

251. Intranet users of a company use the No-pat method of NAT to access the Internet.

If all public IP addresses are used, what will happen to intranet users who access the Internet later?

Squeeze out the previous user and force NAT conversion to access the Internet

Synchronize the message to other NAT conversion equipment for NAT conversion

Automatically switch NAT to PAT and go online

Subsequent intranet users will not be able to access the Internet

252. NEICONF is a ()-based network configuration protocol. Its purpose is to automate network configuration in a programmable manner, thereby simplifying and accelerating the deployment of network services.

253. Among the following options, which routing prefixes satisfy the following IP-Prefix conditions? (Multiple choice)

[HUAWEI] ip ip-prefix test index 10 permit 20.0.0.0 16 greater equal 24 less-equal 28

20.0.1.0/24

20.0.1.0/23

20.0.1.0/25

20.0.1.0/28

254. Which of the following information does the BGP Open message carry? (Multiple choice)

BGP Router ID

Hold time

Local Autonomous System (AS) Number

Routing attributes

255. In a WLAN network, an engineer discovered that the AP started abnormally.

Which of the following does not cause the failure?

The power provider does not support the PoE function

The output power of the power supply party is insufficient.

AP fails to go online

Failure of the power supply party

256. The network administrator checks the BGP neighbor information on a router, and the neighbor information is shown in the figure.

Which of the following statements about this information is correct? (Multiple choice)

The router has not received a BGP route prefix from the peer

The Router ID of the local router is 1.1.1.1

The number of messages received and sent by the peer 3.3.33 is 10 and 20 respectively

The neighbor relationship with peer 3.3.3.3 is an IBGP peer

257. Which of the following descriptions of routing protocol cost values (Cost) is incorrect?

By adjusting the cost value of the route, the suboptimal path problem in certain scenarios can be solved.

The routing cost calculation methods of different routing protocols are generally different, so the Cost values of different routing protocols are not comparable.

When different routing protocols introduce each other, the Cost value must be manually specified, otherwise the introduction cannot be normal.

Usually the overhead E of IS-IS and OSPF is based on bandwidth and has a wide value range, which can be applied to larger-scale networks.

258. The following message appears when the administrator configures OSPF. The reason is Router-ID conflict.

TRUE

FALSE

259. Which of the following technologies can be configured in a network that uses static routing to achieve Layer 3 interoperability, so that the local device can interoperate with the peer device and realize the function of BFD to detect static routes?

BFD multi-hop detection

Static identifier auto-negotiation BFD

BFD single-hop detection

Adjust BFD parameters

260. To prevent inter-area routing loops, OSPF does not allow advertising routing information between two non-backbone areas and allows sing routing information only within an area or between the backbone area and a non-backbone area. Therefore, each ABR must be connected to the backbone area.

TRUE

FALSE

Page 27 of 38

261. Regarding BGP route announcement, which of the following descriptions is wrong? (Multiple choice)

Only routes learned from IGP can be advertised to other BGP neighbors.

All BGP routes learned from all BGP neighbors are advertised to other BGP neighbors.

Only the best route preferred by BGP can be announced to other BGP neighbors.

By default, routes learned from IBGP are not forwarded to other IBGP neighbors.

262. In the USG series firewall, what is the security priority of the DMZ zone?

100

263. In IS-IS, DIS is used to create and update pseudo nodes, and is responsible for generating link state protocol data unit LSP of pseudo nodes.

What is the priority of DIS by default?

127

264. SA (Security Association) is a parameter that must be negotiated when an IPsec tunnel is established, so which of the following parameters is used to uniquely identify SA? (Multiple choice)

Source MAC address

Destination IP address

Security Protocol Number

Header checksum of the network layer header

SPI (Security Parameter Index)

Source IP address

265. Which of the following attributes may not be included in the Update message of a BGP route? (Multiple choice)

AS_Path

Local_Preference

0rigin

MED

266. The network management functional model defined by OSI is divided into multiple functional areas.

Which of the following does not belong to this functional area?

Data management

Performance Management

Fault management

Configuration management

267. For link state routing protocols, when using filter-policy import, the filtered link state information will not be calculated as routes, and its neighbors will not receive complete link state information.

TRUE

FALSE

268. An enterprise needs to move its applications to the cloud. In order to integrate and process various data more quickly and conveniently, you can use Huawei platform () to deploy.

269. The following is a partial configuration of a router.

The correct description of this configuration is:

The data packet whose source address is 1.1.1.1 matches the first ACL statement rule 0, and the matching rule is Allow.

The data packet whose source address is 1.1.1.3 matches the third ACL statement rule 2, and the matching rule is Deny.

The data packet whose source address is 1.1.1.4 matches the fourth ACL statement rule 3, and the matching rule is Allow.

The data packet whose source address is 1.1.1.2 matches the second ACL statement rule 1, and the matching rule is Allow.

270. Unlike STP, RSTP has only one BPDU type, its value is 2, and there is no TCN BPDU.

TRUE

FALSE

Page 28 of 38

271. Which of the following protocols does not support network configuration management?

LLDP

NETCONF

SSH

SNMP

272. What are the main types of IS-IS Hello messages? (Multiple choice)

Level-1-2 LAN IIH

Level-2 LAN IIH

Level-1 LAN IIH

P2P LAN IIH

273. All routers in a network run IS-IS and are all in Area 49.0001. The LSDB of R1 is as shown in the figure. Based on this, the Level of the four routers can be determined.

274. BFD control packets are encapsulated in UDP packets for transmission, so the destination port number of the multi-hop BFD control packets is?

5784

3784

4784

2784

275. How long is the IS-IS LSP flooding time in seconds?

1800 seconds

1500 seconds

1200 seconds

900 seconds

276. During BGP route summarization configuration, the keyword can be used to suppress all specific routes so that only the summary route is advertised. The summary route carries the Atomic-aggregate attribute rather than the community attributes of specific routes.

277. Which of the following does not include the switch role in the stack system?

Main switch

Candidate switch

Slave switch

Standby switch

278. A company has a stack system consisting of three switches that is running stably. Now the main switch has restarted due to a fault.

Which of the following descriptions of this phenomenon are incorrect? (Multiple choice)

Before the original master switch is restarted, the original slave switch will be designated as the new backup switch.

After the original master switch is restarted, the original backup switch will become the new slave switch.

After the original master switch is restarted, the original master switch will become the new master switch.

Before the original master switch is restarted, the original backup switch will be upgraded to the new master switch.

279. In IGMPv1, querier selection depends on a multicast routing protocol, such as PIM. In IGMPv2 and IGMPv3, the interface with the largest IP address acts as the querier.

TRUE

FALSE

280. Which of the following mechanisms does the PIM-DM mode include in the process of building a multicast forwarding tree? (Multiple choice)

Status refresh

SPT switching

Pruning

Diffusion

Page 29 of 38

281. The default time interval for sending BFD detection packets is:

100ms

1000ms

10s

282. In order to ensure that both systems know the status changes, BFD uses a three-way handshake mechanism when establishing and tearing down the BFD state machine.

TRUE

FALSE

283. Which of the following configurations are not mandatory when an administrator configures VRRP?

Preemption mode

Preemption delay

Virtual router priority

Virtual IP address

284. VXLAN users can access the Internet through the VXLAN interface.

TRUE

FALSE

285. iMaster NCE-Campus can be used as an authentication server on a WLAN to authenticate STAs.

TRUE

FALSE

286. Route introduction refers to the operation of publishing routing information from one routing protocol to another routing protocol.

Which of the following statements about routing imports is correct? (Multiple choice)

When implementing route import, you can also deploy route air control, so as to realize the flexible control of correct business traffic

By importing routes, routing information can be transferred between different routing protocols

The routing protocol itself has the anti-loop feature, so there is no need to consider the loop problem when the routes enter each other.

When importing routes, it is necessary to pay attention to the fact that different vendors may have different routing priority agreements

287. The following is part of the output information of the router RTD.

display igmp-snooping IGMP Snooping Information for VLAN 3

IGMP Snooping is Enabled

IGMP IP Version is Set to default 2

IGMP Query Interval is Set to default 60

IGMP Max Response Interral is Set to default 10

IGMP Robustress is Set o default 2

IGMP Lase Weniber Query Interval is Set to defauit 1

IGMP Router Port Aging Interval is Set to 180s or holdtime in hello

Which of the following description of the output information is wrong?

The version of the IGMP message that can be processed in VLAN3 is the default value

The display igmp-snooping command is used to view the IGMP Sooping configuration information on the VLAN

The maximum response time of IGMP in VLAN3 is the default value, which is 60 seconds

IGMP Snoping of VLAN3 is enabled

288. Which of the following description of OSPF neighbor relationship and adjacency relationship is correct?

The adjacency relationship is maintained by OSPF DD packets

OSPF routers must establish an adjacency before exchanging Hello packets

The neighbor relationship is selected from the adjacency relationship and formed to exchange routing information

Not all neighbor relationships can be adjacencies

289. Which of the following statements about the forwarding plane of a switch is false?

Provides high-speed and non-blocking data channels.

Can encapsulate and decapsulate packets.

Can collect packet statistics.

Consists of main control boards and interface boards.

290. On an office network of an enterprise, OSPF is enabled on two directly connected routers. During adjacency establishment, the state machine stays in the 2-way state.

Which of the following statements are not possible causes?

Hello time values are different.

Area IDs are different.

Router IDs conflict.

The N-bit and E-bit of Hello packets are the same.

Page 30 of 38

291. On a network, each router has a local core routing table and protocol routing tables. A routing entry in the local core routing table has multiple key fields.

Which of the following are included?

Destination address of a route

Routing protocol preference of a route

Inbound interface that learns a route

Routing protocol that learns a route

292. In the OSPF routing protocol, the only LSA types involved in intra-area route calculation are Router LSA, Network LSA, and Summary LSA.

TRUE

FALSE

293. When a routing protocol introduces other routing protocols, in order to only introduce a part of the routing information that meets the conditions and set certain attributes of the imported routing information, the route-policy tool can only be used.

TRUE

FALSE

294. The Local_Preference attribute is used to determine the best route for traffic leaving the AS. When multiple routes with the same destination address but different next hops are obtained through different IBGP peers, the route with a higher Local_Preference attribute value will be given priority.

TRUE

FALSE

295. As shown in the figure, router HqE runs two processes, OSPF1 and OSPF 2. The administrator received a request to introduce the two network segments 10.0.1.0/24 and 10.0.4.0/24 in OSPF 2 to OSPF. 1, then to analyze the configuration in the figure, you need to enter the filter-policy ip-prefix Hw () command in the OSPF 1 view.

296. Which of the following descriptions about BGP route aggregation is wrong?

Manual aggregation can control the attributes of aggregated routes and decide whether to publish specific routes

For IPv6, BGP supports both manual aggregation and automatic aggregation

Route aggregation is a mechanism for merging multiple routes. It reduces the size of the routing table by only sending the aggregated route to the peer instead of sending all the specific routes.

In order to avoid routing loops that may be caused by route aggregation, BGP designed the AS_Set attribute

297. Which of the following statements is false about BFD?

The asynchronous mode is the primary BFD operating mode.

In asynchronous mode, two systems periodically exchange BFD Control packets at the negotiated interval. If one system does not receive any BFD Control packets from the other within the detection interval, the BFD session is declared down.

The asynchronous mode does not support the echo function.

In demand mode, after a BFD session is set up, the system does not periodically send BFD Control packets.

298. Which of the following descriptions of AS attributes in BGP is incorrect?

When the GP Speaker advertises this route to the TBGP peer, the AS_Path attribute related to this route will not be changed.

In order to avoid routing loops that may be caused by routing tickets, B6P designed the AS-Set attribute.

AS_Path is a recognized attribute that must be followed

AS-Set attribute is an ordered AS-Path attribute

299. Which of the following descriptions of BGP notification principles is incorrect?

Routes obtained from IBGP peers. Can only be sent to IBGP peers

When a router learns a BGP route from its IBGP peer, it cannot use the route or advertise this route to its EBGP peer unless it learns this route from the IGP protocol. route

Only publish optimal routes

The routes obtained from EBGP peers will be published to all peers.

300. Which of the following descriptions about Policy-Based-Routing and Routing-Policy are correct? (Multiple choice)

The deployment of the routing policy is based on the forwarding plane and will not affect the routing table entries

After the device receives the message, the policy routing will first search for the policy for matching and forwarding. If the match fails, it will search the routing table for forwarding

Routing policies can only be formulated based on source addresses

Policy routing can formulate policies based on parameters such as source and destination IP addresses, protocol types, and packet sizes

Page 31 of 38

301. Because multicast data forwarding relies on routing table entries, problems such as loops and suboptimal paths will not occur during the forwarding process.

TRUE

FALSE

302. Which of the following protocols support network monitoring and management? (Multiple choice)

SFlow

NetStream

SNMP

SSH

303. For a router running the OSPF protocol, all interfaces must belong to the same area.

TRUE

FALSE

304. It is known that Loopback0 exists on router R1 and its address is 1.1.1.1/32. This loopback interface will be introduced when OSPF is enabled and direct routes are introduced.

So which of the following configurations can ensure that Loopback0 will not be introduced when directly connected routes are introduced, and can ensure that other directly connected routes are introduced into OSPF?

A)

Option A

Option B

Option C

Option D

305. When a packet passes through a firewall, the firewall creates a session connection for the packet to guide subsequent forwarding of the packet. However, the firewall does not create session entries for all packets.

For which of the following packets does the firewall not create session entries when the packet reaches the firewall?

ICMP ping packet

GRE packet

Subsequent fragment

UDP packet

306. Administrators can use the import-route command to introduce OSPF under different process IDs to each other.

TRUE

FALSE

307. Which of the following are the differences between IGMP versions? (Multiple choice)

IGMPv1 does not support group-specific queries, but IGMPv2 supports

IGMPv1/v2/v3 cannot support the SSM model

IGMPv1/v2 cannot elect a querier by itself, but IGMPv3 can

For members to leave, IGMPv2/Nv3 can voluntarily leave, but IGMPv1 cannot

308. In the process of transition from IPv4 network to IPv6, some transition technologies have emerged.

Which of the following are common types of transition technologies? (Multiple choice)

Conversion technology

Forced forwarding technology

Dual stack technology

Tunnel Technology

309. On an OSPF network, routers learn routing information on the entire network by exchanging LSAs.

Which of the following values is the LS Age in the LSA header when an LSA is deleted?

1800s

3600s

1200s

600s

310. There can be multiple nodes under a Route-Policy. Different node numbers are identified by node numbers. The relationship between different nodes is an "OR" relationship.

TRUE

FALSE

Page 32 of 38

311. Without a prior version check, an engineer configures IGMP snooping on a device and the version of IGMP snooping is earlier than the IGMP versions on user hosts.

In this case, which of the following situations will occur?

Users cannot receive multicast data because the device forwards received IGMP Report messages only to router ports and does not generate group member ports or forwarding entries.

Users cannot receive multicast data, but the device generates forwarding entries after receiving IGMP Report messages.

The IGMP snooping version of the device is automatically degraded, and users can receive multicast data properly.

The IGMP versions of the hosts are automatically upgraded, and users can receive multicast data properly.

312. After dual-machine hot backup is configured, the primary and backup channels cannot be established. The information on the primary device cannot be normally backed up to the backup device, resulting in abnormal dual-machine hot backup.

What is the possible cause of this failure? (Multiple choice)

The source IP address and source port number of the local end are inconsistent with the destination IP address and destination port number of the peer end.

The retransmission times and retransmission intervals of the active and standby service packets at both ends are inconsistent

The priorities of the two ACs are the same

The TCP channel is not established

313. Which of the following descriptions of RP in PIM-SM are correct? (Multiple choice)

Dynamic RP election will involve two types of roles, C-BSR and C-R

RP is used to process source DR registration information and group member joining requests

Only static RP can specify which multicast groups the RP provides services for.

Not all PIM routers in the network need to know the address of the RP

314. The Neighbor Discovery Protocol (NDP) is an important basic protocol in the IPv6 protocol suite and plays an important role.

Which of the following functions and features does it support?

A. Address resolution

B. Neighbor state tracing

C. Duplicate address detection

D. Redirection

315. IGMP3 not only supports the general group query of IGMPv1 version and the specific group query of IGMPv2 version, but also supports the specified source/group query of IGMPv3 version.

TRUE

FALSE

316. As shown in the figure, PC1 and PC2 are hosts belonging to the same network segment.

Which of the following descriptions about the status of IPv6 neighbors between PC1 and PC2 are correct? (Multiple choice)

If the C address information of PC2 can be queried on PC1, the neighbor relationship may be Stale at this time

If the C address information of PC2 can be queried on PC1, then the neighbor relationship at this time is set as Reachable

There may be five neighbor states between PC1 and PC2, which are Incomplete, Reachable, Stale, Delay and Probe.

If the MAC address information of PC2 can be queried on the PC, the relationship between the department and the residence may be Probe at this time.

317. Which of the following descriptions about route introduction is wrong?

The default level of importing routes into ISIS is Level-2

When importing a certain type of route into BGP, you can directly specify its MED value without using Route-Policy

Import the route into 0SPF, the default is Metric-Type-2

Different BGP processes in the same device can import routes from each other

318. Regarding the description of network address port translation (NAP) and network address translation only (No-PAT), which of the following statements is correct?

No-PAT supports protocol address translation at the network layer

No-PAT only supports protocol port translation at the transport layer

After NATP conversion, for external network users, all packets will only come from the same IP address

NAPT only supports protocol address translation at the network layer

319. IGMP SSM Mapping does not process IGMPv3 report messages. In order to ensure that hosts running any version of IGMP on the same network segment can obtain SSM services, IGMPv3 needs to be run on the multicast router interface connected to the network segment where the member hosts are located.

TRUE

FALSE

320. When a stateful inspection firewall forwards subsequent data packets (not the first packet), which of the following is mainly based on?

Route table

OFIB table

MAC address table

Session table

Page 33 of 38

321. Type 4 LSA (ASBR-Summary-LSA) is not allowed to appear in the NSSA area.

TRUE

FALSE

322. As a network administrator, which of the following protocols can be used for network device configuration? (Multiple choice)

LLDP

SNMP

NETCONF

SSH

323. Which of the following description about verifying whether a received Hello message is legal is wrong?

If the network type of the receiving port is point-to-point or virtual link, the Network Mask field is not checked

The RouterDeadIntera1 field in the received Hello message must be consistent with the configuration of the receiving port

If the network type of the receiving port is broadcast, point-to-multipoint or NBMA, the Network Mask field in the received Hello message may be inconsistent with that of the interface

The E-bit in the Options field in the received Hello message must be consistent with the configuration of the relevant area

324. IS-IS overload flag refers to the OL field in the LSP message. After setting the overload flag on a device, other devices will not use this device for forwarding when calculating SPF, and will only calculate the direct route of the device.

TRUE

FALSE

325. On an IS-IS network, two directly connected routers establish a neighbor relationship through the three-way handshake mechanism by default, regardless of whether the network type is P2P or broadcast.

TRUE

FALSE

326. Which of the following routing protocols support the default route through command configuration?

BGP

IS-IS

OSPF

ICMP

327. This configuration is part of RTA configuration.

[RTA] ospf 100

[RTA-ospf-100] silent-interface GigabitEthernet 1/0/0

Which of the following statements regarding the configuration are true?

RTA cannot establish a neighbor relationship with the neighbor that this interface is directly connected to.

GigabitEthernet 1/0/0 is prohibited from sending OSPF packets.

Direct routes of GigabitEthernet 1/0/0 can still be advertised.

This interface cannot send Hello packets.

328. Please match the following BGP messages with their corresponding functions.

329. On the campus OSPF network shown in the following figure, the interfaces connecting the five routers are GE interfaces, and their costs are not changed. The import-route command is run on R1. After the network converges, the route to the server at 192.168.1.0/24 is queried on R2.

Which of the following is the cost of this route?

330. The following is the information output by a router.

Which is the correct description of this information?

The router negotiates with its neighbors and uses BGP version 3

The AS number of the router is 100

The router has an IBGP neighbor relationship with neighbor 2.2.2.2.

Router1D of this router is 1.1.1.1

Page 34 of 38

331. Which of the following statements about BGP security are correct? (Multiple choice)

Keychain authentication can be used between BGP neighbors to reduce the possibility of being attacked, and Keychain has a set of passwords, which can be automatically switched according to the configuration

When configuring the MD5 authentication password, if the simple option is used, the password will be saved in the configuration file in plain text, which poses a security risk

You can use the display bgp peer verbose command to view the authentication details of BGP peers

To prevent attackers from simulating real BGP protocol packets to attack the device, you can configure the GTSM function to detect the TTL value in the IP packet header

332. The advantages of network address translation (NAT) technology do not include which of the following?

Because address translation can hide the user address of the internal network and improve the security of the internal network, a router with NAT function can directly replace the firewall

Users with private addresses can access the Internet

Can effectively reduce the consumption of public IP addresses

Allow users to retain internal solutions while changing operators, enhancing the flexibility of connecting to public networks

333. BFD itself does not have a neighbor discovery mechanism, but relies on the upper-layer application being served to notify its neighbor information to establish a session.

TRUE

FALSE

334. An edge port is a new port role added to RSTP to overcome the disadvantages of STP.

Which of the following statements is false about this port role?

The port does not participate in RSTP calculation.

The port can directly enter the Forwarding state from the Discarding state.

After receiving a configuration BPDU, the port is still in the Forwarding state.

The Up and Down states of the port do not cause network topology changes.

335. As shown in the figure below, RTC announces 10.1.1.0/24 into BGP, and RTC is the client of route reflector RTB. Then router RT() will not receive the route entry 10.1.1.0/24 reflected by RTB.

336. In BGP, when the routing policy changes, neighbors are notified through Notification messages. Only BGP devices that support route refresh capabilities will send and respond to this message.

TRUE

FALSE

337. NAC (Network Access Control) network access control includes three authentication methods. () authentication, MAC authentication and Porta authentication.

338. In dual-link hot backup, the AP will establish CAPWAP links with the main AC and backup AC.

TRUE

FALSE

339. Which of the following statements about Layer 2 roaming and Layer 3 roaming is correct? (Multiple choice)

If the VLAN IDs associated with the front and back are the same when the STA roams, it must belong to Layer 2 roaming

Layer 2 roaming means that the client roams in the same subnet

Layer 3 roaming means that the client roams between different subnets

The VLAN on the AP service set associated with the STA must be the same before and after layer-3 roaming

340. A forwarding information database (FIB) can directly guide packet forwarding on a router.

TRUE

FALSE

Page 35 of 38

341. Which of the following does the basic framework of the SSH protocol not include?

SSH user authentication protocol

SSH connection protocol

SSH transport layer protocol

SSH User Audit Protocol

342. Which of the following overhead types does IS-IS support? (Multiple choice)

Narrow

compatible

wide

Narrow-compatible

343. In the MA network, after the DR and BDR election is completed, if the BDR fails, the DRother will re-elect a new BDR until the original BDR returns to normal.

TRUE

FALSE

344. Which of the following descriptions about the difference between stacking and clustering is wrong? (Multiple choice)

Both stacking and clustering can improve resource utilization and reduce the complexity of network planning

The difference between stacking and clustering is that a stack of modular switches is called a stack, and a boxed switch is called a cluster.

Both stacking and clustering can be combined with link aggregation technology to easily build a highly reliable, loop-free campus network

Both stacking and clustering can combine multiple switches to logically virtualize into one switch

345. A Router LSA is shown in the figure, which of the following statements is wrong?

The Router ID of this router is 10.0.12.1

This router is the DR

This router has established an adjacency relationship

This router supports the import of external routes

346. Which of the following descriptions about LSA and LSDB are wrong? (Multiple choice)

The LS sequence number field is used to detect old and duplicate LSAs

The combination of LS type and Link StateID jointly identifies an LSA

LSA is the smallest unit of LSDB

The LSage field in the LSA header indicates the remaining lifetime of the LSA

347. BGP prefers the route with the best Origin attribute value. The value of the Origin attribute is: EGP, IGP, ().

348. When multiple ASBRs introduce the same external route into the same OSPF domain, use the external route type with metric-type 2 to avoid suboptimal paths.

TRUE

FALSE

349. The following is the information output by a router through the display bgp routing-table command: BGP Local router ID is 192.168.2.2 Status codes: *-valid, >-best, d-damped, h-history, i-internal, s- suppressed, S-Stale Origin: i-IGP, e-EGP, ? incomplete Total Number of Routes: 9 Network Next Hop MED LocPrfPrefVal Path/0gn*>1.1.1.9/32 0.0.0.0*)i 2.2.2.7/32 10.1 .1.2100 (65001)i 1.3.1 1000 (6501165001)i*i 1.2.2100 (65011)i*>i 2.2.2.8/32 (6500165011)i 1.3.2100*i

Regarding the description of the above output information, which one is wrong?

The route to 2.2.2.7/32 with the next hop being 10.1.3.1 is the optimal route.

There are two paths to 2.2.2.8/32

Routes to 2.2.2.7/32 are injected through the network command.

The Router ID of this device is 192.168.2.2

350. Regarding the BGP recognized arbitrary attribute, which of the following descriptions are correct? (Multiple choice)

It is not required to exist in the Update message, you can decide whether to add it to the Update message according to the specific situation

BGP routers may not recognize

Must be passed between BGP neighbors

BGP routers must be identified

Page 36 of 38

351. Which of the following types of equipment is suitable for Huawei IP wide-area bearer network solution?

NetEngine 8000

NetEngine AR6000

CE12804

AirEngine 5760-22w

352. Which of the following statements regarding the stateful inspection firewall is true?

When the stateful inspection firewall checks packets, packets of one same connection are not correlated.

Because UDP is a connectionless protocol, so the stateful inspection firewall cannot match UDP packets with the status table.

The stateful inspection firewall only needs to match the first data packet against a rule, and the subsequent packets of the connection are matched directly in the state table.

The stateful inspection firewall needs to match the rules for each incoming packet.

353. In the network shown in the figure, the R1 device is configured with route penetration. Then the R1 device sends the LSP of Level 1-2 to R3 so that R3 can learn the entire network route.

TRUE

FALSE

354. As shown in the figure, R1 and R2 are in a backup group. After R2 fails, R1 becomes the Master device.

Now if R2 returns to normal, which of the following actions will occur?

Immediately switch to Master device

Immediately switch to Backup device

Switch to Master device in about 3.61 seconds

Switch to Master device in 0.61 seconds

355. The default value of the ospf dr-prioritye command is 1, and the value range is 0~255.

TRUE

FALSE

356. IGMP Snooping mainly solves the problem of?

Legality of IGMP Report messages

There are many receiver hosts on the network segment, and the router will receive many IGMP Report messages.

Solve the problem of broadcasting multicast data packets on Layer 2 devices, and use them to manage and control the forwarding of multicast data packets

The receiver host only supports the IGMPv2 protocol, but the SSM multicast model is used in the network

357. In 0SPF, using the default-route-advertise command will turn the router into an ABR.

TRUE

FLASE

358. Which of the following statements is false?

If the current DR fails, the current BDR automatically becomes a new DR, and a BDR will be elected again.

A device with a higher router priority has a higher election priority.

When a router with the highest router priority joins an OSPF network, this router will become the new D

If two devices have the same router priority, the device with a larger router ID has a higher election priority.

359. Regarding multicast MAC addresses, which of the following statements are incorrect? (Multiple choice)

1 multicast MAC address correctly corresponds to 32 IP multicast addresses

The function of the multicast MAC address is to identify receivers belonging to the same multicast group on the link layer

The upper 24 bits of the multicast MAC address are 0x01005f, the 25th bit is fixed at 1, and the lower 23 bits of the MAC address are the lower 23 bits of the multicast IP address

A multicast MAC address uniquely corresponds to an IP multicast address

360. In PIM-SM, which of the following description of RP is wrong?

The initial multicast streams of all groups in the shared tree are forwarded to the receiver through the RP

One RP can connect to multiple multicast services at the same time, and one multicast group can correspond to multiple RPs.

RP can be responsible for the forwarding of several or all multicast groups. There can be one RP in the network

All members of the group and multicast sources that send multicast data to the group converge to the only R

Page 37 of 38

361. Similar to the OSPF DR, the IS-IS DIS needs to be elected on a broadcast network. However, the OSPF DR is preemptive by default, whereas the IS-IS DIS is not preemptive by default.

TRUE

FALSE

362. Which of the following statements about the BFD detection mode is correct? (Multiple choice)

Asynchronous mode is a commonly used BFD detection mode

In query mode, once the BFD session is established, the system will no longer send BFD control packets periodically

Asynchronous detection mode does not support echo function

In asynchronous mode, the systems will send BFD control packets according to the negotiated period. If a system does not receive the BFD control packet from the peer within the detection time, it will declare the status of the BFD session as Down.

363. The interface using Silent-Interface will not receive and send OSPF messages, but directly connected routes can be advertised to OSPF.

TRUE

FALSE

364. Which of the following description about BGP features is wrong?

BGP is an external routing protocol used to transfer routing information between ASs

BGP is a link state protocol

BGP has rich route filtering and routing policies

BGP supports CIDR

365. As shown in the figure, four Huawei switches have been running and configured with the MSTP protocol. Now SW3 needs to be set as the root bridge of Instance 10.

Which of the following commands can be used to achieve this?

stp vlan 10 root primary

stp instance 10 priority 4096

stp root primary

stp instance 10 root primary

366. The Huawei Cloud Campus solution supports the Free Mobility function.

Which of the following descriptions about the Free Mobility function is correct? (Multiple choice)

The administrator can uniformly manage the entire network policy on the controller and execute the business policy on the device

In the free mobility solution, the administrator does not need to repeat the configuration for each device

The controller is not only the authentication center in the campus network, but also the management center of business policies

The administrator does not need to pay attention to the user's IP address when configuring the policy

367. The existing R1 and R2 form a VRRP backup group with a VRID of 2.

If the user wants to set R1 as the gateway for forwarding data in the backup group, which of the following configurations can be used to achieve this? (Multiple choice)

Set the VRRP priority of R1 to 200, and keep the default value of R2

Set the VRRP priority of R2 to 50, and keep R1 at the default value

Set the VRRP priority of R1 to 255, and keep the default value of R2

Set the VRRP priority of R2 to 0, and keep R1 at the default value

368. Which of the following VPN technologies is a Remote Access VPN?

SSL VPN

IPsec VPN

MPLS VPN

GRE Over IPsec

369. Multiple BGP processes cannot be configured on one router.

TRUE

FALSE

370. BGP establishes neighbor relationships through UDP interaction.

TRUE

FALSE

Page 38 of 38

371. The function of routing protocol priority is to assign different priorities to routes discovered by different protocols, so that when a router learns the same route from different routing protocols at the same time, it can have a selected priority.

TRUE

FALSE

372. SDN and NFV are essentially the same concept, both describing network function virtualization.

TRUE

FALSE

373. Which of the following descriptions about the four forwarding models of WLAN roaming traffic are correct? (Multiple choice)

The difference between direct forwarding in Layer 3 roaming and tunnel forwarding in Layer 3 roaming is whether the packet needs to be returned to the HAP

There is no difference between direct forwarding in layer 2 roaming and tunnel forwarding in layer 2 roaming, both are forwarded directly in the local network of FAP or FAC

During the forwarding of the Layer 3 roaming tunnel, if the STA wants to access the atomic network, it needs to return the message to the HAP

The difference between Layer 2 roaming forwarding and Layer 3 roaming forwarding is whether the subnet before and after STA roaming is the same subnet

374. Which of the following statements about multicast packet forwarding is true?

If a multicast data packet fails the RPF check, the packet must have been received through a sub-optimal interface. However, this interface still receives and forwards the multicast traffic downstream.

IGMP snooping cannot control the scope of multicast traffic flooding on a Layer 2 network.

The source address of a multicast packet is a unicast address.

In multicast transmission, the destination address of a packet can be the unicast address of a host.

375. Which of the following descriptions of the VRRP working process is incorrect?

The stabilized Master device will periodically send notification messages.

In the VRRP backup group, the Master device will first be elected based on the VRRP priority.

After the original Master device fails, the new Master device will immediately send an ARP message.

If the Master device fails, the Backup device will immediately switch to the Master device.

376. When multiple access channels are set for the same access requirement, the insecure access channels are not used and secure access channels are selected in normal cases.

Which of the following are secure access channels?

HTTPS

Telnet

SNMPv2

SFTP

377. What kinds of special areas does OSPF define? (Multiple choice)

Not-So-Stubby Area

Stub-Area

Totally NSSA

Totally Stub Area

378. An administrator of a company modifies a user's access rights and authorization attributes and other parameters on the authentication server.

At this time, user A who has successfully passed 802.1x authentication will perform which of the following actions?

User A directly performs re-authentication, and if successful, it will continue to be online normally

User A does not perform re-authentication and continues to be online normally

User A is directly offline without re-authentication

The device sends the reserved user authentication parameters to the server for re-authentication. If successful, the user: continue to go online normally

379. The content output by the display bgp routing-table command is as shown in the figure.

Which of the following descriptions of this content is correct?

The MED value of the route to the 192.168.1.0/24 network segment is 100

The route to the 192.168.1.0/24 network segment is learned through AS200

The route to the 192.168.1.0/24 network segment is injected into the BGP routing table through the network command.

The route to the 192.168.1.0/24 network segment is not optimal in the BGP routing table.

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