JN0-280 Dumps Questions - Effective Way to Get Certified

JN0-280 Dumps Questions – Effective Way to Get Certified

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March 24, 2024

If you're in the field of Juniper, you know how important it is to stay up-to-date with the latest knowledge and skills to protect your organization's networks and data. One way to do that is by obtaining JNCIA-DC, specifically the JN0-280 exam. While preparing for the JN0-280 exam, you might consider using JN0-280 dumps to help you familiarize yourself with the exam format and content. These JN0-280 exam dumps questions can be an effective way to gauge your knowledge and identify areas where you may need additional study. Study online free JN0-280 exam dumps below.

Page 1 of 6

1. What statement is true about load-balancing?

Load balancing is only supported after applying an advanced license.

Load balancing on Juniper devices is processed per-packet.

Load balancing on Juniper devices is processed per-flow.

Load balancing is only supported by dynamic routing protocols.

2. Which of the following statements are true regarding Graceful Restart (GR)? (Choose two)

It helps in maintaining uninterrupted forwarding during a routing process restart.

It is used to increase the convergence time of the network.

It requires support from both the restarting router and its neighbors.

It decreases network stability during protocol restarts.

3. You are creating an IP fabric underlay and want to use OSPF as your routing protocol.

In this scenario, which statement is correct?

All leaf devices must be configured in separate OSPF areas.

All leaf and spine devices must be the same model to ensure the proper load-balancing behavior.

Interface speeds should be the same throughout the fabric to ensure that all links are utilized.

All spine devices must use the same router I

4. What is the primary use of a virtual link in OSPF?

To connect OSPF areas to external networks.

To encrypt OSPF traffic.

To connect an OSPF area to the backbone area through a non-backbone area.

To balance load across multiple links.

5. When configuring High Availability components, which of the following practices are recommended? (Choose two)

Regularly update firmware to non-recommended versions.

Ensure physical redundancy of critical components.

Use a single path for data and control traffic.

Implement regular testing of failover mechanisms.

6. You have configured a load balancing policy.

Which statement is correct about applying the policy?

The policy is applied as an export policy under the routing protocol’s hierarchy.

The policy is applied as an export policy under routing-options forwarding table.

The policy is applied as an import policy under the routing protocol’s hierarchy.

The policy is applied as an import policy under routing-options forwarding table.

7. In OSPF, which command is commonly used to monitor neighbor relationships?

show ip ospf neighbors

show ospf database

show ip route ospf

show ospf interfaces

8. Exhibit:

Referring to the exhibit, which statement is correct?

The configuration will commit successfully and BGP group 1 will operate as IBG

The configuration will commit successfully and BGP group 1 will operate as EBG

BGP group 1 requires a type external parameter.

BGP group 1 requires a type internal parameter.

9. In OSPF, how is the Router ID determined?

By the highest IP address on any of the router's active interfaces.

By the lowest MAC address of the router.

By a manually configured value in the router configuration.

By the highest loopback interface IP address.

10. In troubleshooting a Virtual Chassis setup, what is a common issue to look for?

Incompatible software versions between member switches

Too many switches in a single Virtual Chassis configuration

Use of copper cables for inter-switch connections

Activation of all ports for Virtual Chassis connections

Page 2 of 6

11. Referring to the exhibit, how many collision domains are present in the topology?

12. In the context of Link Aggregation Groups (LAG), what is the primary purpose of LACP?

To provide a method for encrypting data packets

To dynamically manage the bundling of several physical ports

To reduce the speed of data transfer

To increase the error rate in data transmission

13. Which of the following are correct about OSPF router ID selection? (Choose two)

It can be manually configured.

It is chosen based on the highest IP address of any active interface by default.

It is always the IP address of the loopback interface.

It is selected based on the lowest MAC address.

14. Which three actions are required to implement filter-based forwarding? (Choose three.)

You must create an instance-type forwarding routing instance.

You must create an instance-type vrf routing instance.

You must create a match filter.

You must create a security policy.

You must create a RIB group.

15. Which statement is correct about areas in OSPF?

An OSPF area is used to segment Layer 2 broadcast domains.

OSPF areas are used to isolate the effects of a broadcast storm.

OSPF areas are used to reduce the size of the link-state database.

An OSPF area is used to signify the autonomous system to which each device belongs.

16. What is the default route preference of a static route in the Junos OS?

17. What is the main advantage of using an Overlay Network in a data center?

It simplifies physical network design by allowing multiple virtual topologies over it.

It replaces the need for physical network infrastructure.

It offers higher physical bandwidth capacity.

It provides direct Internet access to applications.

18. What is the default route preference for a static route on a Junos device?

130

19. Which statement is correct about an IP fabric?

Transit traffic is passed through the network based on the original frame's destination MAC address.

Load sharing is provided by the routing protocol used.

Loop prevention is provided by the underlying spanning tree protocol used.

The entire IP fabric is one large broadcast domain.

20. Referring to the exhibit, which two statements are true? (Choose two.)

The configuration will not pass the commit check.

The BGP group is configured to attempt an EBGP peering session with 192.168.100.2.

The configuration will pass the commit check.

The BGP group is configured to attempt an EBGP peering session with 192.168.100.1.

Page 3 of 6

21. Referring to the exhibit, which statement is true?

BFD will bring down the BGP session if no BFD packets are received for 2700 seconds.

BFD packets are being sent every second.

BFD will bring down the BGP session if no BFD packets are received for 2700 milliseconds.

BFD only records a syslog message if three BFD packets are missed.

22. What is the primary use of Martian addresses in network routing?

To define addresses used for multicasting.

To identify addresses that should be excluded from routing.

To configure virtual IP addresses for load balancing.

To create a backup routing plan.

23. Why is EVPN often used in conjunction with VXLAN in modern data centers?

To enable direct Internet access for applications.

For providing Layer 2 connectivity over a Layer 3 fabric.

To increase the physical bandwidth of the underlying network.

To physically separate different customer environments.

24. What is the primary purpose of an IRB Layer 3 interface?

to provide load balancing

to provide a default VLAN ID

to provide inter-VLAN routing

to provide port security

25. Which operation mode command will display the mapping between the VLAN ID and ports on a switch?

show route

show ethernet-switching table

show interfaces terse

show vlans

26. In networking, what is a RIB group primarily used for?

To balance the load across multiple links

To filter routes based on specific criteria

To group multiple Routing Information Bases together for a common purpose

To dynamically generate routing entries

27. Which statement is correct about member interfaces when creating a LAG?

The interface's MTU settings must match on all member interfaces.

The interface’s duplex settings and link speed must be the same on all member interfaces.

Member interfaces must all be allocated on the same chassis when using a Virtual Chassis.

Member interfaces must all be allocated on the same PF

28. Referring to the exhibit, what needs to be done to make this a valid IP fabric?

Remove the connection between the leaf nodes

Remove one of the redundant links between a leaf node and a spine node

Add two connections between the spine nodes

Add a connection between the spine nodes

29. How does VLAN tagging benefit network segmentation?

By encrypting data traffic between VLANs.

By ensuring the same IP address range can be used in different VLANs.

By enabling the identification and separation of traffic belonging to different VLANs.

By providing a backup path for data in case of link failure.

30. What is the main purpose of Bidirectional Forwarding Detection (BFD)?

to detect network path failures

to determine if the forwarding routes are correct

to detect the forwarding protocol

to determine packet round-trip latency

Page 4 of 6

31. How does OSPF calculate the best path to a particular prefix?

It finds the path with the numerically lowest cost.

It finds the path with the shortest autonomous system path.

It finds the path with the least number of hops.

It finds the path with the numerically lowest route preference.

32. Which two statements describe an OSPF ABR? (Choose two.)

By default, an ABR does not need to have any links in the backbone area.

By default, an ABR is an OSPF router with links in two areas.

By default, an ABR is an OSPF router with all of its links in one area.

By default, an ABR must have one link in the OSPF backbone area.

33. Which two statements are correct about using LACP on a Junos device? (Choose two.)

Both sides of the LACP session must be in active mode to exchange LACP packets on a Junos device.

One side of the LACP session must be in active mode to exchange LACP packets on a Junos device.

LACP is used to monitor the status of an aggregated Ethernet bundle's member interfaces on a Junos device.

LACP is used to automatically add and delete interfaces from aggregated Ethernet bundles on a Junos device.

34. What is the primary function of a VLAN?

To encrypt network traffic.

To provide a routing mechanism between different networks.

To segment a network into multiple broadcast domains.

To control network traffic based on MAC addresses.

35. What is the primary role of an IRB interface in a VLAN configuration?

To provide a gateway for VLAN traffic.

To encrypt VLAN traffic.

To prioritize VLAN traffic.

To filter VLAN traffic based on MAC addresses.

36. Which static routing parameter will silently drop the packet if it is set as the next hop?

Reject

Resolve

Readvertise

Discard

37. In the Junos OS, which feature is used to create an alternate next hop with a unique preference for a static route?

Preference

Resolve

Next-hop

Qualified-next-hop

38. What is Integrated Routing and Bridging (IRB) primarily used for in a Junos device?

To separate VLAN traffic.

To provide inter-VLAN routing.

For aggregating multiple interfaces.

For implementing security policies.

39. Which state in the adjacency process do OSPF routers check the MTU size?

Init

Exchange

Done

ExStart

40. You are troubleshooting a downed BGP session.

Referring to the exhibit, what is the cause of the problem?

The UDP session between the peers has not been established.

The local peer has sent an Open message but not received one from the remote peer.

The TCP session between the peers has not been established.

The local peer has sent an Update message but not received one from the remote peer.

Page 5 of 6

41. Which EBGP feature must be used when peering to a non-directly connected peer address?

multihop

AS path

local preference

multipath

42. VLANs help in reducing which of the following? (Choose two)

Collision domains

Broadcast domains

Routing complexity

Encryption requirements

43. What type of BGP is used for routing within the same autonomous system?

IBGP

EBGP

Static BGP

Dynamic BGP

44. What is the function of the 'Weight' attribute in BGP, and where is it used in the route selection process?

It is used to prioritize routes received from different EBGP peers and is considered before the AS_PATH attribute.

It determines the stability of a route and is checked after the Local Preference attribute.

It is a Cisco-specific attribute used to prefer paths from one BGP speaker over another, evaluated before the Local Preference.

It is used to balance load among multiple links and is considered after the MED attribute.

45. Generated routes in a network are mainly used to:

Reduce the overall size of the routing table.

Manually configure specific network routes.

Automatically create a route when a specified condition is met.

Summarize external routes into the network.

46. Which statement is correct about IBGP?

It requires a physical full mesh.

It requires a logical full mesh.

It ensures that the local and remote peers use different AS numbers.

It ensures that duplicate AS numbers are not present in the AS path.

47. Exhibit:

Referring to the exhibit, at which interval will the interface be considered down if no hello packets are received?

2000 seconds

400 milliseconds

400 seconds

2000 milliseconds

48. When evaluating BGP routes, what will be evaluated first?

The local preference value

The AS path

The MED value

The origin value

49. Which statement about switches is correct?

Each port is a member of VLAN 2 by default.

Every port is in a unique collision domain.

Each port is in a unique broadcast domain by default.

All ports reside in the same collision domain.

50. How does a layer 2 switch populate its bridge table?

It stores the protocol number of frames traversing the network.

It stores both the source and destination MAC addresses of frames traversing the network.

It stores the destination MAC address of frames traversing the network.

It stores the source MAC address of frames traversing the network.

Page 6 of 6

51. Which two statements describe an IP fabric? (Choose two.)

An IP fabric allows devices to always be one hop away.

An IP fabric depends on Layer 2 switching.

An IP fabric uses spine and leaf devices.

An IP fabric provides traffic load sharing.

52. A generated route is configured under which hierarchy?

[edit policy-options]

[edit routing-instance]

[edit routing-options]

[edit protocols]

53. Which two statements about IBGP are correct? (Choose two.)

By default, IBGP has a TTL of 1.

IBGP uses AS path for loop prevention.

By default, IBGP has a TTL of 255.

IBGP uses full mesh for loop prevention.

54. Which of the following are features of storm control on Junos switches? (Choose two)

It can be configured to shut down a port during a storm.

It supports thresholds for broadcast, multicast, and unknown unicast traffic.

It encrypts broadcast and multicast traffic.

It automatically reroutes traffic during a storm.

55. Which statement is correct about an IRB interface?

An IRB interface switches traffic within the same VLA

An IRB interface trunks together VLANs on different switches.

An IRB interface is a physical Layer 3 interface that connects VLANs together.

An IRB interface is a Layer 3 interface that can be used to route between VLANs.

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