Get Certified Easily with Online H31-341_V2.5-ENU Dumps

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August 31, 2023

Using HCIP-Transmission V2.5 H31-341_V2.5-ENU questions can help you build confidence as you prepare for the exam. By practicing with these H31-341_V2.5-ENU dumps questions, you will be better prepared and more confident when you take the actual exam. Besides, H31-341_V2.5-ENU exam dumps questions cover a wide range of topics that are relevant to the certification exam. By using H31-341_V2.5-ENU dumps questions, you will be able to ensure that you have a comprehensive understanding of the material covered on the exam. Practice free Huawei H31-341_V2.5-ENU exam dumps below.

Page 1 of 16

1. In an 80-wave system, using the TMB1 DAP (TN150AC106) amplifier, the total input power is 797 and the typical gain is 19dB. What is the nominal single-wave output optical power?

0 dBm

2 dBm

4 dBm

1 dBm

2. At a certain OLA site, the maximum optical power output of the OAU is 20dBm. It is used in a C-band 80-wave system, but 10 waves are actually opened. There is no spectrum analysis board configured, and the combined signal needs to be adjusted. How many dBm should the output optical power of the UT port of the OAU be adjusted to?

20 dBm

1 dBm

5 dBm

11 dBm

3. In daily maintenance scenarios, loopback is one of the common operations. Which of the following descriptions of loopback operations is correct?

Software loopback can detect the quality of the optical port

Hardware loopback is a more thorough loopback method that can detect the quality of the optical port.

Software loopback and hardware loopback have exactly the same functions.

Hardware loopback can avoid increasing the optical attenuation on the optical port

4. Which of the following are common methods for fault analysis and location in NG WDM systems? (Multiple choice)

Alarm and performance analysis

Loopback method

Substitution method

Signal flow analysis

Instrument test method

5. Which of the following descriptions about the commissioning of a 100G and 10G hybrid transmission system is wrong?

The existing 10G system is expanded to 100G channels, and the dispersion compensation type needs to be adjusted

100G is a coherent system, 10G is a non-coherent system, and mixed transmission requires an isolation zone

In the scenario of expanding the capacity of the existing incoherent network to 100G coherent mixed transmission, the OSNR tolerance and non-electrical relay transmission distance of the 100G wavelength can be improved by reducing the optical power of the fiber.

Pay attention to the mixed transmission spectrum. The spectrum of 100G signal is wider and appears lower than that of 10G signal in the spectrum, but the actual optical power is equivalent.

6. Which of the following descriptions about O TU4 frame rate calculation is correct?

255/227 x99532800 kbit/s

255/238 x2488320 kbit/s

255/237 X9953280 kbit/s

255/236 x39813120 kbit/s

7. Which of the following descriptions about the TNVZE224 board are correct? (Multiple choice)

Support VPWS and VPLS services

Support PHY loopback, but not MAC loopback

On the U64 standard/U64 enhanced/U32 standard subrack, the backplane bandwidth is 200Gbit/s

When used in conjunction with a unified line, the cross-scheduling granularity between branch boards is Packets.

8. Which of the following descriptions about the OTN mapping/multiplexing order at the transmitting end is correct?

Client-OTUK-OPUK-ODUK

Client-ODUK-OTUK-OPU

Client-ODUK-OPUK-OTUK

Client-OPUK-ODUK-OTUK

9. The FAN board of the OptiXtrans E6616/OptiX OSN 1800V Pro device has four independent fans. If any fan fails, the system can operate normally for 96 hours at an ambient temperature of -5C~40C.

True

False

10. A service passes through two wavelength division rings. The two wavelength division rings are tangently networked. The tangent network elements share the electronic rack. It is required to implement segmented ODUkSNCP protection, that is, each ring is interrupted once due to a fault. Which of the following types should be configured?

GSNC/L

SNC/S

SNC/N

SNC/S or SNC/N

Page 2 of 16

11. MPLS-TPOAM functions are divided into active OAM and on-demand OAM. Which of the following options belong to active OAM? (Multiple choice)

RDI

Ais

FDI

12. TDM PWE3 is also called CES service carried by PWE3, which supports unstructured simulation mode SATOP and structured simulation mode CESOPSN.

Which of the following descriptions of the two simulation modes is wrong?

In SAToP simulation mode, the overhead and payload in the TDM signal are transparently transmitted, supporting alarm transparent transmission

The control word of the SAToP message is optional

SAToP does not need to identify the frame structure in the TDM signal. It processes the TDM service as a serial data stream, divides the TDM stream into integer multiples of the E1 frame length, and then encapsulates it into PWVE3 messages for transmission.

The number of E1 frames that can be encapsulated in a CESOPSN message is determined by the "message loading time". The TDM frame period is 125 microseconds. When the "message loading time" is 1ms, it means that each PW message will load 8

13. Which operation should be performed before querying the bit error and optical power on the network management system, otherwise the corresponding data cannot be queried?

Create a logical fiber

Configuration data

Synchronize network data

Enable network element performance monitoring time

14. During the commissioning process, it is necessary to ensure that the input optical power of the OTU board is lower than the overload point to avoid burning the optical module or affecting performance. In particular, the overload point of the PIN optical module is very low. Before measuring the optical power, the optical fiber is required to be inserted or not inserted.

True

False

15. Which of the following is the basic requirement of DWDM system for light source?

Using direct modulation method

Dispersion tolerance is relatively low

High luminous power

Standard and stable wavelength

16. Which of the following boards can realize the broadcast function of business signals in the receiving direction? (Multiple choice)

DWSS20

TD20

WSD9

WSMD9

17. Which of the following descriptions of QPSK modulation technology are wrong? (Multiple choice)

With QPSK, one phase represents two digital bits, which is equivalent to "divide 1 into 2" for the data, reducing the rate by half

ePDM-QPSK is the best solution for 100G wavelength division transmission

The essence of QPSK is to reduce the baud rate of the optical signal by half without reducing the line rate by selecting two possible values in the phase of the optical field.

QPSK modulation can increase the spectral bandwidth, reduce the system's requirements for OSNR and the harm of fiber nonlinearity, and improve dispersion tolerance, PMD tolerance, etc.

18. Which of the following multiplexing methods is used to multiplex low-order ODUk signals into high-order ODUk signals?

Time Division Multiplexing

Wavelength Division Multiplexing

Frequency Division Multiplexing

Space Division Multiplexing

19. For OTN interfaces without optical layer overhead, in order to achieve the purpose of LI monitoring, the QTUk/OTUk-v/OTUkVAOTUCn signal is terminated when the interface signal is terminated.

True

False

20. In daily maintenance scenarios, resetting is one of the common operations. Which of the following descriptions about resetting a board is wrong?

Press and hold the RST button on the main control panel to achieve a soft reset.

Hard reset is similar to plugging and unplugging a board

Hard reset can be achieved through network management

Soft reset can only be achieved by asking the pipe

Page 3 of 16

21. The rich overhead in the special frame structure of OTN can operate, manage and maintain the signal during the transmission process, such as: SM, PM and TCMi overhead to monitor the service signal layer by layer.

True

False

22. Since different frequency components of the light source have different group velocities, during the transmission process, the time delays of light beams of different frequencies are different, resulting in dispersion, which is called ()

23. In the PW FPS scenario, which of the following descriptions of switching conditions and configurations are correct? (Multiple choice)

APW FPS must be configured symmetrically (configured on both ends)

Switching conditions depend on the status of the APS protocol

The switching condition depends on the OAM status of the working/protection path

PW FPS can be configured asymmetrically (configured on one end and not on the other end)

24. In the wavelength division system, if the receivable TTI and the actual received TTI of the SM layer are inconsistent, an () alarm will be reported.

25. Which nonlinear effect does the RAMAN amplifier use?

Stimulated Raman Scattering

Dispersion

Self-Phase Modulation

Four-wave mixing

26. What principle of light is used when light propagates in optical fibers?

Total reflection

Scattering

Incident

Refraction

27. Automatic gain control (AGC) can solve the problem of affecting the optical power of the normal operating wavelength when the wave number increases or decreases in a multi-wavelength system.

True

False

28. Instrument testing is generally used to eliminate external problems of transmission equipment and docking problems with other equipment.

True

False

29. In the MPLS-TPOAM protocol model, the network can be divided into three layers. Which of the following description of the relationship between these three layers is correct? (Multiple choice)

Tunnel is the client layer of Section and also the service layer of P

PW is the client layer of the tunnel and also the service layer of the service.

MPLS-TP Section is the service layer of the tunnel

Section is the client layer of the tunnel and also the service layer of the P

30. Which of the following options are correct regarding the adjustment of fiber optical power? (Multiple choice)

The fiber-input optical power index value adopts the special fiber-input power (high power) of each optical fiber by default.

When the downstream light is placed at the minimum gain, the output power meets the requirements, and the upstream fiber input power cannot be lower than the fiber input power index

If the output power of the downstream light does not meet the requirements at the minimum gain, the upstream EVOA attenuation value shall be reduced first, but the minimum attenuation value shall not be lower than the attenuation value required by the fiber input power index.

If the output power of the downstream optical amplifier still does not meet the requirements, adjust and increase the gain of the downstream optical amplifier.

Page 4 of 16

31. Which of the following descriptions about L2VPN is wrong?

PW-based E-LAN service is also called VPLS service, which is a Layer 2 VPN technology that simulates a local area network.

When configuring E-LINE services based on PW, you need to create a virtual switching instance VSI

L2VPN includes E-LINE and E-LA

E-LINE is used to provide L2 layer point-to-point services, and E-LAN is used to simulate a local area network in a wide area network.

The E-LINE service based on PW is a point-to-point Layer 2 VPN technology that transparently transmits Layer 2 services between users.

32. Which of the devices involved in the key technologies of WDM systems is a passive device?

Multiplexer Demultiplexer

Light source

Amplifier

Optical monitoring board

33. The M10 optical port of the M48Vo2 board can only receive wavelength signals with a wavelength of λ20.

True

False

34. Among the following three types of ODUKSNCP protection, which one cannot be configured in the scenario where the service working or protection path is carried by two or more channels?

SNC/N

SNC/S and SNC/N

SNC/I

SNC/S

35. The number of E1 frames that can be encapsulated in a CESOPSN message is determined by the "message loading time"

True

False

36. Which of the following options are correct for describing the cross-connect capacity of the OptiXtrans E9624/OptixOSN9800M24 subrack? (Multiple choice)

The maximum cross-connect capacity of PacketVC-4 supported by a single large slot in the OptiXtrans E9624/Optix OSN 9800 M24 subrack 1:1 cross-connect mode and 1:3 cross-connect mode is different

The maximum VC-4 cross-connect capacity supported by a single large slot in the 1:1 cross-connect mode of the Optixtrans E9624/Optix OSN 9800 M24 subrack is 160 Gbit/s.

The maximum ODUk/OSUflex cross-connect capacity supported by a single large slot in the 1:1 cross-connect mode of the Optixtrans E9624/0ptiX OSN 9800 M24 subrack is 400 Gbit/s.

Optixtrans E9624/OptiX OSN 9800 M24 subrack 1:3 cross mode single large slot supports

37. In the troubleshooting scenario, which of the following descriptions of possible causes of optical power anomalies are correct? (Multiple choice)

Line performance degradation

The OTU board or optical amplifier board fails or its performance deteriorates.

Pigtail connection error

The device temperature is too high

38. What are the options for the shortcomings of erbium-doped fiber amplifiers? (Multiple choice)

Low noise index

Gain non-flatness

Gain range is fixed and limited

Optical surge problem

39. QPSK modulation can reduce OSNR and reduce the harm of fiber nonlinearity, and improve dispersion tolerance, PMD tolerance, etc.

True

False

40. A certain NGWDM network element has a MUT_LOS alarm reported on the amplifier board, but no OSC_LOS alarm on the monitoring channel board, and all services are interrupted. Which of the following are possible reasons? (Multiple choice)

There is a problem with the pigtail between the FIU board and the amplifier board

Optical amplifier failure

The splitter/combiner board of the opposite station is faulty

Line fiber interruption

Page 5 of 16

41. EM R8 board is a fixed wavelength combining and splitting board, which can support 8 specific non-continuous wavelengths.

True

False

42. The size of the OTUk frame is fixed, that is, whether it is OTU1, OTU2, or OTU4, it is 4 rows and 4080 columns.

True

False

43. In the FOADM scenario, which of the following descriptions of the differences between parallel FOADM and serial FOADM are correct? (Multiple choice)

The maximum number of upper and lower wavelengths is different

Different wave combiner/demultiplexer boards are used

Local services can only be dispatched to a fixed direction

Different types of amplifier boards are used

44. In the troubleshooting scenario, which of the following descriptions of the alarms reported when the optical monitoring board receives light abnormally is correct?

OSC LOS

R LOF

MUT LOS

R LOS

45. When obtaining alarms or performance information through the network management, care should be taken to ensure that the time of each network element in the network is synchronized. If the network element time is set wrongly, alarms and performance information will be reported wrongly or not reported at all.

True

False

46. Colored means () means each up and down wave can only have fixed wavelengths up and down

47. Loopback is a common operation for daily maintenance and troubleshooting. Which of the following options are correct in describing loopback operations? (Multiple choice)

Hardware loopback is the manual loopback of optical and electrical ports using pigtails and self-loop cables.

After the inner loop is executed, the signal flows to the outside of this WDM network element

After the external loop is executed, the signal flows to the inside of the WDM network element.

When performing hardware loopback operation on the optical port, it is necessary to consider increasing the optical attenuation

48. The optical power transmitted by Classi M is greater than that of Class 1.

True

False

49. Which of the following descriptions of cabinet installation requirements is wrong?

After all cabinet door panels on the main aisle side are installed, they should be aligned in a straight line with an error of less than 5 cm

The cabinet installation position is correct and meets the requirements of the construction drawing

All screws fixing the bracket to the ground and the bracket to the cabinet should be installed correctly. Check whether all the screws are installed and tightened, and whether the installation sequence of spring washers, flat washers, insulating sleeves, and leveling washers is correct.

The cabinets should be arranged closely and neatly, the vertical deviation should be less than 3mm, and adjacent cabinets should be close together.

50. The frame structure of each level of OTUk is the same. The higher the level, the higher the frame frequency and rate.

True

False

Page 6 of 16

51. Which of the following options are there for data dump types on the network management? (Multiple choice)

Manual dump

Automatic dump

Overflow dump

Cycle Dump

52. If the sensitivity and overload point of the receiving end of an OTU board are 76 dBm and 0 dBm respectively, which of the following descriptions of the optical power at the receiving end meet the requirements? (Multiple choice)

-10

-7

-15

53. Which of the following is not included in the triggering conditions for the automatic switching of 1+1 on the client side?

AKOLP or DCP board reports R LOS

The OTU board is not in place

When SD is not enabled, the OTU board reports ODUk_PMDEG

OTU board reports OTUk LOF

54. Generally, before troubleshooting, collect and save on-site data.

True

False

55. MOTUm interface, at the transmitting end, first completes the encapsulation of ODUk PM overhead, and then completes the encapsulation of ODUk TCM.

True

False

56. The optical power index of a 100G system with a single wavelength is lower than that of a 10G system. When a 10G system expands the capacity of a 100G channel, it can meet the optical power requirements of the fiber by reducing the OA gain and thus reducing the single-wavelength output optical power of the OA.

True

False

57. Which of the following external factors may cause low optical power? (Multiple choice)

Fiber Aging

The optical cable is bent

The connector is dirty

ODF frame with double-sided fiber

58. Which of the following is a networking method for parallel FOADM sites?

EX40+EMR8

MR4+MR4

EMR8+EMR8

EX40+EX40

59. Which of the following descriptions of fiber optic deployment requirements is wrong?

The connection with the light board, flange and other connecting parts must be reliable

The optical fiber cannot move freely in the retaining ring

Optical fiber laying should not be forced or bent unnaturally, and no other cables or objects should be placed on top of it after laying.

The labels on both ends of the optical fiber are filled in correctly, clearly, neatly, and in the same direction

Connection points should be clean

60. Which of the following methods does the OptiXtrans E9600/OptiX OSN 9800 equipment support for mapping client-side services to ODUk signals? (Multiple choice)

Interleaved Mode

Sequential Mode

Time slot method

Standard method

Page 7 of 16

61. Which of the following descriptions about client-side 1+1 protection are correct? (Multiple choice)

When using the OLP board, the SCC board reports the protection switching alarm when a switch occurs.

Switching conditions are: the board is not in place, SF (signal failure) or SD (signal degradation)

The only protection board supported is the OLP board

The SD card is disabled by default.

62. Ping function and Traceroute function are through interactive MPLS Echo request and MPLS echo reply packets are used to detect the bidirectional connectivity of tunnels and PWs.

True

False

63. 1. Which of the following descriptions about deleting a path from the network management system is wrong?

Remove only the wavelength division paths on the network layer at the network management side from the network layer.

Services will not be interrupted after the path is removed from the network layer

Deleting a path from the network element layer will delete the path on the network element side and the network layer together

Deleting the path from the network layer and the network element layer will interrupt the service

64. The technology that uses which of the following characteristics of the laser to coherently receive the optical signal and recover the amplitude, phase and polarization state information from the received signal is called coherent reception technology?

Same amplitude

Vibration direction is the same

Vibration direction is opposite

Same frequency

65. According to the G.709 protocol, how many ODU2e signals can be contained in one ODU3 signal?

66. Which of the following cabinet types can be installed with the Optixtrans E9624 subrack? (Multiple choice)

APM3000

A66B

A63B

APM5000

67. Milliwatt (mw) and () (dBm) are two commonly used units of optical power. The former is linear and the latter is nonlinear.

68. When BIP-8 in the OTUk segment monitoring overhead SM detects a bit error block, what alarm may be reported? (Multiple choice)

OTUkDEG

ODUKDEG

ODUk EXC

OTUk EXC

69. What backplane buses does NG WDM equipment contain? (Multiple choice)

Clock bus

Power bus

Control and communication bus

Electrical crossbar bus

70. If the optical monitoring board cannot receive optical power, it will report () alarm.

Page 8 of 16

71. Which of the following options are wrong in describing the OptiXtrans E96clel & OptiXOSN9800 system architecture? (Multiple choice)

Adopt L1+L2+13 three-layer system architecture

L1 electrical layer supports cross-scheduling of ODUk/VC services

L2 layer implements switching based on Ethernet/MPLS-TP

L3 layer implements routing switching based on TCP/IP

72. The core component of ROADM is the wavelength selective switch (WSS)

True

False

73. Preliminary location of single board problems

Which of the following options correctly orders the above four steps?

124 3

2143

2134

1234

74. Which of the following descriptions about OptiXtrans E6600/OptiX OSN1800 is correct?

The OptiXtrans E6608/Optix OSN 180011 Pro DC chassis can accommodate up to 7 service boards.

When the OptiXtrans E6616/OptiX OSN 1800V Pro uses the TMK5SXCH cross-connect board, the current maximum capacity of a single-slot ODUk is 400 Gbit/s

OptiXtrans E6616/OptiX OSN 1800 V Pro adopts M

OTN unified switching, has a large service access capacity, can realize the scheduling of electrical layer signal service aggregation nodes, and enhance network flexibility.

The fan box of OptiXtrans E6608/Optix OSN180011 Pro adopts the right-in and left-out exhaust cooling method

75. OTUk LOM indicates the abnormal frame alignment signal alarm. If the frame alignment process is in the out-of- frame (OOF) state for 3 ms continuously, this alarm is generated.

True

False

76. In actual wavelength division systems, systems with a rate of 10G or below are greatly affected by polarization mode dispersion.

True

False

77. Which of the following descriptions about the TMB1EL0M board is wrong?

The board supports ODU non-aggregation mode and ODUO aggregation mode

The ELOM board is used as an enhanced 8-way multi-rate port wavelength conversion board to complete the conversion between Any service and 0TU2 (e).

ELOM board supports 20G service scheduling capability

The side output optical signal is adjustable within the C-band 80 wavelength range, with a wavelength interval of 50 GHz

78. In the OTUk frame structure, which of the following alarms are related to segment monitoring? (Multiple choice)

OTUk SM DEG

OTUk BDI

OTUkDEG

OTUk SM BDI

79. Which of the following options are the conditions for ODUk SNCP switching? (Multiple choice)

OSC LOS

OTuk LOF

RLOS

Main control module failure

80. If the tunnel where a PW is located is configured with Tunnel AP, PW APS cannot be configured for the PW.

True

False

Page 9 of 16

81. The service path belongs to the network layer data on the network management side. Deleting the path at the network layer will not affect the service.

True

False

82. In the TCP/IP protocol, the transport layer defines the data packet format and addressing method and is mainly responsible for the routing of data packets in the network.

True

False

83. Which of the following costs is not included in OO S costs?

Optical multiplexing section overhead

Optical transmission section overhead

Optical channel overhead

Optical channel transport unit overhead

84. Which of the following descriptions of Flexible Grid are correct? (Multiple choice)

The wavelength signal spectrum can be continuous n * slice GHz (n=6- 64, 1 slice=6.25 GHz)

Meeting the bandwidth requirements of high-speed services

When multiple rate services are mixed, bandwidth can be flexibly allocated to improve bandwidth utilization

Support adjustment of central wavelength

85. Which of the following descriptions about optical fiber is wrong?

Multimode optical fiber usually has a diameter of about 50um

The refractive index n1 of the core is greater than the refractive index n2 of the cladding

The loss of optical fiber mainly depends on three kinds of loss: absorption loss, scattering loss and bending loss.

The diameter of single-mode optical fiber is generally greater than 10um

86. Which of the following descriptions about the OptiX transE9600/Optix OSN9800 system circuit board is wrong?

All versions of U401 do not support the wavelength division side optical signal adjustable within the 96 wavelength range of 50GHz interval in the extended C band

TNU3U401 supports hybrid transmission of OTN, SDH and packet services

TNU4U401 supports mixed transmission of OTN, SDH and packet services

U401 adopts coherent receiving technology and is applied to coherent systems

87. Which of the following is not an optical layer board in a wavelength division network?

Business processing board

Optical Add/Drop Multiplexing Board

Optical monitoring channel board

Spectral analysis board

88. Which layer of the TCP/IP protocol is the TCP/UDP protocol located at?

Application layer

Network Layer

Data Link Layer

Transport layer

89. Which of the following descriptions about branch SNCP protection is wrong?

Branch SNCP protection uses the dual-transmit selective receiving function of the electrical layer crossover to protect the customer-side services accessed by the branch board.

Trigger conditions: board not in place, SF, SD

When configuring a branch SNCP, you need to set the SNCP subtype.

The crossover granularity is GE or Any signal

90. Modulation is the process of processing the information of the signal source and adding it to the carrier to change it into a form suitable for channel transmission. It is a technology that makes the carrier change with the signal.

True

False

Page 10 of 16

91. Which of the following descriptions about the DWSS20 board are correct? (Multiple choice)

The wavelet adding part can add any wavelength combination dispatched from any direction through any port in AM1~AM20 and output it from the OUT port.

DWSS20 supports optical layer signal service scheduling of up to 20 wavelengths

DWSS20 only supports single-wavelength optical power adjustment for the upper wavelength, but not for the lower wavelength

The wavelet part realizes the signal of the main optical channel received from the IN port, and outputs it through the DM1~DM20 ports with any wavelength combination, realizing the scheduling of any wavelength to any port

92. Which of the following IP addresses is not a private IP address?

172, 255.0.1

10.0.0.10

10.255.0.1

192.168.0.1

93. When installing the equipment, the Optix OSN 9800 U32 standard subrack cannot be installed in which of the following cabinets?

N63B

N66B

N63E

A66B

94. When the client accesses 10GE LAN service, the line rate needs to be set to speed-up mode

True

False

95. The sink functions of the TCM sublayer include monitoring overhead and reporting defect information. Which of the following about the defect information reported by the TCM sublayer is wrong?

DEG will be reported at the meeting

Report BDI at the meeting

TTI will be reported at the meeting

Report BIAE at the meeting

96. Which of the following boards contain VOA modules? (Multiple choice)

WSM9

RDU9

WSMD9

WSD9

DWSS20

97. Which of the following overheads belong to ODUk level overheads? (Multiple choice)

APS/PCC

TCM

NJO

98. If DCM is configured in the system, the DCM input single-wavelength optical power should be no greater than how many dBm?

-4

-2

-3

-1

99. Which of the following protections requires the use of the APS protocol?

1+1 optical line protection

Branch SNCP protection

Tunnel APS 1:1

ODUkSNCP protection

100. Which of the following descriptions about the TMMK1UNS5 board is wrong?

Supports the transmission of OTN services with a total bandwidth not exceeding 200 Gbit/s.

This board belongs to the unified line board. The current version supports the mixed transmission of OTN services, SDH services and packet services.

Supports the relay mode and can be used in the electrical relay station in the system to realize the electrical relay function of the corresponding optical signal.

Supports the mixed transmission of ODUO, ODUk_ODU2, ODU2eODU3, ODU4, and ODUflex.

Page 11 of 16

101. The ODN ODUK tandem connection monitoring overhead (TCM) supports multiple monitoring modes. Which of the following options is wrong?

Cascading

Reuse

Severe heat

Nesting

102. Which of the following options are commonly used test instruments for transmission systems? (Multiple choice)

OTDR (Optical Time Domain Reflectometer)

Spectrum Analyzer

SmartBits Tester

Optical power meter

SDH Tester

103. MPLS-TP is a subset of MPLS, which removes the connectionless IP-based forwarding and adds end-to-end OAM functions.

True

False

104. The following is about OptiXtrans. Which of the following is wrong in the description of the PANEL panel on DC908?

Automatic commissioning can be started through the PANEL panel

The ETH port on the BPANEL panel is the management communication interface

Pulling out the PANEL will affect the normal operation of the business

The network element IP can be set through the PANEL panel

105. Which of the following descriptions of the user-side interface and network-side interface of the E-Line service are correct? (Multiple choice)

The user side interface is a Layer 2 port, and the network side interface is a Layer 3 port

The user side interface is a Layer 3 port, and the network side interface is a Layer 2 port

The user side interface is NNI and the network side interface is UNI

The user side interface is UNI and the network side interface is NNI

106. In a 40-wave system, using a DAP (TN15CIAC1O6) amplifier, the total input power is -16~4dBm, and the typical gain is 16dB. What should the nominal single-wave output optical power be?

5 dBm

1 dBm

4 dBm

0 dBm

107. The optical monitoring channel is established for monitoring the WDM optical transmission system. ITU-T recommends using 1510nm wavelength first. Which of the following is the recommended rate?

576 Kbit/s

64 Kbit/s

192 Kbit/s

2 Mbit/s

108. When forwarding a message based on MPLS labels, what actions may be required for the data packet to perform? (Multiple choice)

Switch

Push

Swap

Pop

109. In WDM network design, as long as enough EDFAs are cascaded to compensate for the optical power loss during transmission, the system can transmit over a long distance without limitation.

True

False

110. The frame structure of the signal officer consists of 4 rows and 4080 columns. The k value can be a number from 0 to 6, representing line rates of 1.25G, 2.5G, 10G, 40G, 100G, 200G and 400G respectively.

True

False

Page 12 of 16

111. In the Colored scenario, each add or drop port can only add or drop fixed wavelengths.

True

False

112. The path that a data packet takes in an MPLS network is called a label switching path (LSR). Which of the following descriptions about LSP is wrong?

As an intermediate node of LSP, Transit is indispensable in LS

Like Ingress, there is only one Egress in an LSP, and both are LERs.

Transit is the intermediate node of LS

Its main function is to look up the label forwarding information table and complete MPLS message forwarding through label switching.

Ingress is the starting node of LS

An LSP can only have one Ingress.

113. Which of the following options is consistent with the meaning of "the wavelength carrying local services can be transmitted to a fixed direction"?

Colorless

Directed

Colored

Directionless

114. According to the description, select the correct sub-protection type

115. In DWDM systems, which of the following are the main reasons for choosing only the 1550 nm transmission window instead of 1310 nm? (Multiple choice)

1550 nm wavelength region is suitable for long distance transmission

The EDFA's operating wavelength flat region is included in this window

1310nm is not at the low loss point

The nonlinear effect in the 1550rlm wavelength region is small

116. Which of the following is not included in the general encapsulation format of PTE3?

Payload

KPLS Tags

FCS

Control word CW

117. Which of the following options are included in the half-year maintenance project on the network management side? (Multiple choice)

Testing protection switching

Active/standby switchover

Back up network element data

Check ECC routing

118. In the PWAPS switching scenario, which of the following statements about the switching process are correct? (Multiple choice)

Switching means switching the services received from the working PW in the normal state to the protection P

Switching means switching the services received from the working PW in the normal state to those received from the protection P

Bridging means switching the services sent to the working PW in the normal state to the protection P

Switching means switching the services sent to the working PW in the normal state to the protection P

119. Which of the following descriptions about the commissioning of the super 100G and 100G mixed transmission system is wrong?

For AE beyond 100G and 100G hybrid transmission systems, the optical power requirements for different fiber types are the same.

Different modulation modes of the super 100G channel have different mainstream fiber optical power indicators

When the 100G system is expanded beyond 100G channels, the indicators used in the initial network commissioning need to be used for commissioning to ensure that the combined optical power remains unchanged.

The mainstream optical power index of super 100G channels with different channel spacing is different

120. In a WDM system, if the expected TTI and the actual TTI are different, what alarm will be reported?

ROTUK LOP

OTUK LOS

OTUK TIM

OTUK T1

Page 13 of 16

121. Which of the following descriptions of the advantages of OTN is wrong?

Use wavelength division function to meet the Tb/s transmission bandwidth requirement per fiber

Provides up to 5 levels of nested overlapping TCM connection monitoring

Provide powerful out-of-band FEC function

Can provide 2M-400G service interface

122. If you only need to use LAG for port level protection, configure the non-load sharing LAG on the board

True

False

123. Which of the following is not included in the hash algorithm used for LAG load sharing?

Based on IP address allocation

Allocation based on business type

Based on MPLS label allocation

Based on MAC address allocation

124. Fiber amplifiers can be divided into rare earth ion doped fiber amplifiers and nonlinear fiber amplifiers. The working principle of rare earth ion doped fiber amplifiers is stimulated radiation.

True

False

125. When configuring the insertion of ODUKLCK on the network management system, which of the following descriptions of alarm processing are correct?

Downstream sites insert ODUk PM AIS

This site reports to ODUK PM BDI

Downstream station reports ODUk PM LCK

This site reports ODUk PM BEI

126. The last 256 columns of the OTN frame structure are the FEC area, and its function is ()

127. Which of the following options are used to transmit alarms from upstream to downstream? (Multiple choice)

AIS

BIAE

BEI

LCK

128. Which of the following options are correct regarding the description of business boundary labels? (Multiple choice)

When the service demarcation label is Service, access to Ethernet objects with VLAN is not allowed.

When the service boundary tag is User, it means that the user search method is Ethernet. The PE device does not recognize and process U-TAG

When the service boundary tag is Service, it means that the user reporting method is VLA

The PE device will identify and process the TAG according to the PW encapsulation mode.

When the service boundary label is User, Ethernet frames with VLAN are not allowed to be accessed

129. DWSS20 board can realize 20-dimensional optical signal scheduling.

True

False

130. Which of the following descriptions about optical line protection and ODUkSNCP protection is wrong?

Optical line protection belongs to network level protection, while ODUkSNCP belongs to service level protection

The switching time of optical line protection and ODUKSNCP protection is less than 50ms. To avoid cable breakage, multiple switching is triggered. The two protections cannot coexist.

The optical line protection is switched by the OLP board, and the ODUkSNCP protection is switched by the cross-connect board.

Optical line protection and ODUkSNCP protection are both single-ended switching. When a single fiber fails, it will cause inconsistent sending and receiving routes.

Page 14 of 16

131. Which of the following operations will directly or indirectly lead to business interruption? (Multiple choice)

Perform PRBS test

Initialize the database on the network management side

Disable the FEC function on the OTU board

Create a single-station optical cross-connect on the network management system

Single-ended change of OTU board FEC mode

132. Before dealing with WDM faults, some preparation work needs to be done. Which of the following items belong to the preparation work? (Multiple choice)

Collect and save field data

Be familiar with engineering information, such as networking diagrams, wavelength configuration, equipment operation and maintenance status, etc.

Master the basic operations of equipment and network management

Understand the basic principles of WDM and be familiar with the causes of alarms

133. Equipment maintenance personnel can determine whether the equipment has ever failed by observing the indicator lights on site.

True

False

134. Optixtrans DC908 chassis can be configured with 1 SCC board and 1 PANEL board, or it can be configured as 1+1 dual master control.

True

False

135. In a troubleshooting scenario, which of the following descriptions of channels for obtaining signal flow information is wrong?

Network diagram of the entire network, used for segmentation when locating faults

Wavelength allocation diagram, which can show detailed wavelength paths

Network management, which can display the signal flow of a specific network layer and provide corresponding alarm and performance information

Fiber connection diagram, for a single site, is the actual fiber connection diagram within the site

136. The influence of polarization mode dispersion on systems with a rate of 10G or below is generally negligible.

True

False

137. Special fiber input power (high power) is a higher fiber input power than the mainstream fiber input power. What is its main purpose?

Nonlinearity

Power

OSNR

Dispersion

138. Which of the following descriptions of OTN's optical layer interfaces OTM-n, m, OTM-nr, m is wrong?

n represents the number of waves carried at maximum capacity

r means that some functions of the OTM have been removed. Here, it means that the OSC function has been removed.

m represents the rate, which can only be 1, 2, or 3.

OTM-nr, m plus OSC signal becomes OTM-n, m

139. CC is used to detect the inbound connectivity between any pair of MEPs in a MEG. If the destination MEP does not receive a CCM message within three times the message sending period, it is considered that there is a connectivity problem from the source MEP to the destination MEP.

True

False

140. Which of the following descriptions about the TNG2WSMD9 board are correct? (Multiple choice)

Realize optical layer-level signal service scheduling for multiple wavelengths

WSMD9 board is a dynamic optical add/drop multiplexing unit

The board supports optical power adjustment and online optical power detection

9-port wavelength selective combiner (ultra-wide C-band)

Page 15 of 16

141. When a network is designed, an OSC board is used. The optical power received by the OSC board at this site = the optical power output by the OSC board at the other site - line loss - 2xFIU insertion loss (without considering the addition of solid attenuation)

True

False

142. By summarizing the OTU1/2/3 frame rates, we can get the calculation formula for the OTUk frame rate. Which of the following is correct?

OTUk rate = 255/(236-k) X STM-N rate

OTUk rate = 255/(235-k) X STM-N rate

OTUk rate = 255/(239-k) X STM-N rate

OTUk rate = 255/(237-k) x STM-N frequency rate

143. To achieve alarm performance maintenance at the optical layer, it is necessary to ensure that the optical fiber connection on the network element side is correct, so that alarm performance management can be achieved in the corresponding OTS, OMS and OCH paths, regardless of the logical fiber connection on the network management side.

True

False

144. Which of the following descriptions about ROADM sites are correct? (Multiple choice)

ROADM can realize flexible up and down transmission within the site

The use of ROADM is a necessary condition for realizing the ASON function of the electrical layer

ROADM can realize automatic optical power adjustment function

The use of ROADM is a prerequisite for realizing the ASON function of the optical layer

145. NGWDM system fault analysis methods include signal flow analysis method, alarm analysis method, instrument testing method, () and replacement method.

146. Which of the following alarms is transmitted from downstream to upstream?

ODUk PM AIS

ODUk PM BDI

ODUk PM OCI

ODUK PM LCK

147. Which of the following options are trigger conditions for LAG static aggregation protection? (Multiple choice)

Port working mode changes

Port priority changes

System priority changes

Working port failure

148. Which of the following descriptions about the OTU board are correct? (Multiple choice)

For compatible mode boards, users do not need to worry about the logical ports inside the board when configuring cross-connections.

Standard mode boards are easy to operate and can reduce maintenance costs

Standard mode has fewer path levels than compatible mode

For standard mode boards, only the service mapping paths under the channels or physical ports are displayed on the network management system, and all ODU layers are displayed directly under the physical ports.

149. Which of the following options are correct regarding the requirements for single-board configuration in OTN networks? (Multiple choice)

All boards should be inserted to the bottom and the board handles should be properly buckled.

The female end of the single board connector has no defects such as insertion marks, holes, or damage.

The markings on the single board handle should be correct and clear

The mounting screws on the board must be screwed into place

150. In the troubleshooting scenario, in order to promptly discover and locate the abnormal optical power fault, which of the following descriptions of matters that need to be paid attention to in daily maintenance are correct? (Multiple choice)

Regularly back up the receiving and sending optical power of important boards

Understand the typical values of input and output optical power of different types of OTU boards and optical amplifier boards

Regularly back up the optical power at each point

Record the wavelength of each channel and the signal-to-noise ratio of each receiving point

Page 16 of 16

151. TM20 board can realize the addition of 20 coherent optical signals of different wavelengths and multiplex them into one combined optical signal.

True

False

152. The ODUk tandem monitoring overhead supports multiple maintenance signals. When the ODUk_TCM_LCK maintenance signal is generated, which one does STAT detect?

111

101

110

153. In a 10G wavelength division system, the dispersion tolerance of a line board is 1600ps/nm. G.652 optical cable is used to transmit the signal. Considering the influence of dispersion on the system, what is the signal dispersion limited distance?

20 KM

266 KM

40 KM

80 KM

154. In a wavelength division multiplexing system, when the number of waves exceeds how many, is it recommended to use an arrayed waveguide grating (AWG)?

8 waves

4 waves

16 waves

20 waves

155. Which of the following is consistent with the description of "The dispersion at 1310nm is. The typical value of the dispersion coefficient near 1550nm is 17ps/nm km"?

655

652

653

654

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