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Latest Huawei H12-931 Exam Questions and Answers, 2025 Update | SPOTO

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Question #1
The OTU2 frame length is approximately four times the OTU1 frame length
A. TRUE
B. FALSE
View answer
Correct Answer: B
Question #2
When the PTN equipment EX2 board is connected to the STM-64 port, how should the working mode of the interface be set?
A. Self-negotiation
B. Adaptive
C. LAN
D. WANcorrect
E. Unable to connect
View answer
Correct Answer: D
Question #3
When subnetting 172.17.15.0/28, which of the following addresses are legal subnet addresses? (Multiple choice)
A. 172
B. 172
C. 172
D. 172
View answer
Correct Answer: AD
Question #4
NSF (Non-Stop Forwarding) means that when a certain type of device failure occurs, data forwarding is still performed normally to protect the key services on the network. In which of the following scenarios will the NSF function fail to perform data forwarding normally?
A. XCS board hard reset (XCS board has 1+1 protection)
B. Soft reset of the service processing board
C. Hard reset of the service processing boardcorrect
D. XCS board soft reset (XCS board has no protection)
View answer
Correct Answer: C
Question #5
Which of the following operations may be a bit error due to nonlinear effects?
A. Replace the optical amplifier board at the transmit end with a Raman board, and the bit error of the OTU board is reduced
B. Increase the gain of the optical amplifier at the transmitting end, and reduce the bit error of the OTU board
C. Reduce the output optical power of the sending end, and the bit error of the OTU board is reducedcorrect
D. Adjust the gain of the optical amplifier board at the receiving end to reduce the bit error of the OTU board
View answer
Correct Answer: C
Question #6
Two MSP rings intersect, and there is coexistence of SNCP and MSP protection in one of the network elements at the intersection point. How to solve the secondary switching phenomenon caused by the coexistence of protection?
A. Set the delay time when configuring the MSP cross-connect
B. Set the delay time when configuring the SNCP cross-connectcorrect
C. Delay time needs to be set when configuring MSP and SNCP
D. No need to set delay time
View answer
Correct Answer: B
Question #7
In a point-to-point WDM networking scenario, the signal-to-noise ratio of a single channel is low, while other channels are normal. What is the reason for this being impossible?
A. The optical power of the OTU board corresponding to this wave at the transmitting end has decreased
B. The fiber pigtail attenuation from the OTU board corresponding to this wave to the combiner increases
C. Increased attenuation on the optical pathcorrect
D. The gain slope of the amplifier changes
View answer
Correct Answer: C
Question #8
When Huawei OTN is interconnected with ZTE OTN equipment, the ODU0 and ODU1 time slots of Huawei OTN equipment adopt sequential mode. Which of the following statements is correct? (Multiple choice)
A. The order of ODU1 is the samecorrect
B. The order of ODU1 is differentcorrect
C. The order of ODU0 is the same
D. The order of ODU0 is differentcorrect
View answer
Correct Answer: ABD
Question #9
Which of the following protections in microwave equipment does not require dual slots?
A. SD
B. FD
C. HSBcorrect
D. SD+FD
View answer
Correct Answer: C
Question #10
The new TN55ND2 board of the OSN8800 equipment was found to be unable to go online. Which of the following reasons are impossible?
A. The master controller has a SWDL AUTOMATCH_INH alarm
B. The master controller has a SWDL_PKG_NOBDSOFT alarm
C. The master controller has a SWDL CHGMNG_NOMATCH alarm
D. The master controller has a SWDL_BD WEAKMATCH alarmcorrect
View answer
Correct Answer: D
Question #11
Which of the following statements about OTN overhead is correct? (Multiple choice)
A. The bit value of BDI in the SM/TCMi/PM overhead field (bit 5 of the third byte) of 5 consecutive frames is "1", which will generate BDIcorrect
B. BIP-8 bit errors in SM, PM, and TCM monitor bit errors in different areas of different layers in OTN
C. In the OTN frame structure, only SM overhead has IAE and BIAE functions
D. Both TCM and PM have ODUK-LCK, ODUK-OCI, ODUK-AIS three kinds of maintenance informationcorrect
View answer
Correct Answer: AD
Question #12
Which of the following is not a single-layer board?
A. Optical Add/Drop Multiplexing Board
B. Optical monitoring channel board
C. Spectral analysis board
D. Business processing boardcorrect
View answer
Correct Answer: D
Question #13
In the Ethernet service OAM, the name of the node that can initiate the OAM operation is?
A. MD
B. MA
C. MEPcorrect
D. MIP
View answer
Correct Answer: C
Question #14
If there is a problem with the CORBA connection, you can analyze it in the following way: If it is not the problem on the U2000 side, you should search for it from the upper-layer network management itself or U2000 and the upper-layer network management; if the name and notification service cannot be started normally, you should check whether the corresponding port is occupied , or try to use other ports; if the U2000 cannot be started, check whether the CORBA configuration files bundle.cfq and ems.cfq are
A. TRUEcorrect
B. FALSE
View answer
Correct Answer: A
Question #15
What is the wavelength of the OSC channel of Huawei OTN equipment? (Multiple choice)
A. 1550nmcorrect
B. 1491nmcorrect
C. 1510nmcorrect
D. 1565nm
E. 1511nmcorrect
View answer
Correct Answer: ABCE
Question #16
In the 40-wavelength system of wavelength division equipment, due to the aging of the customer's optical cable, the optical cable between sites 2# and 3# needs to be replaced, and a 4# optical amplifier site needs to be added between 2# and 3#. Which of the following statements are correct?
A. The optical power of site 2# does not need to be re-adjusted
B. The optical power of site 3# does not need to be re-adjusted
C. It is necessary to consider whether the dispersion budget is sufficientcorrect
D. No need to consider whether the dispersion budget is sufficient
View answer
Correct Answer: C
Question #17
Which of the following statements about the main and backup channels of optical line protection is wrong?
A. "Initial Difference Between Active and Standby Channels (dB)" ― It is used to set the reference value of the optical power difference between the active and standby channels of the board
B. "Difference Threshold of Active and Standby Channels (dB)" - It is used to set the difference between the optical power of the active and standby optical ports of the board to a certain value, which is regarded as a signal failure (SF)
C. When the difference between the active and standby optical power exceeds the threshold, the optical switch will switch the service to the standby channel, and the set value supports query
D. If the current optical power difference between the active and standby channels exceeds the "main and standby channel difference threshold (dB)", the system will initiate protection switching
View answer
Correct Answer: C
Question #18
If both the bidirectional OA and OSC report a loss of light alarm in a WDM network, which is the most likely cause?
A. One-way interruption of line optical fiber
B. The line optical fiber is interrupted in both directionscorrect
C. Unidirectional degradation of line fiber
D. Bidirectional degradation of line optical fiber
View answer
Correct Answer: B
Question #19
Which of the following statements about PTN's VPLS technology is wrong?
A. VPLS (Virtual Private LAN Services, virtual private LAN service), is a service that provides LAN-like services on an MPLS (Multiprotocol Label Switching, Multiprotocol Label Switching) network
B. VSI is a virtual layer 2 forwarding entity, which defines the number of members of the VPLS domain on the PE, similar to a virtual switch
C. The PE can decide whether to forward the Ethernet frame directly to the CE or to the peer through the PW only according to the VLAN ID in the user message without other parameters (such as the destination MAC address in the message, etc
D. You need to manually configure split horizon groups to avoid Full-mesh VPLS loops
View answer
Correct Answer: C
Question #20
There is a lower limit to the length of an Ethernet frame. What is the main reason for this?
A. Carrier sense
B. Multi-point access
C. Conflict detectioncorrect
D. Improve network bandwidth utilization
View answer
Correct Answer: C
Question #21
Which of the following descriptions of electrical layer protection ODUk SNCP and branch SNCP is different?
A. Cross-grain
B. Scope of protectioncorrect
C. Protecting Subtypes
D. Working Principle
View answer
Correct Answer: B
Question #22
Which of the following statements is wrong when creating an upgrade task?
A. The upgrade operator must use the "admin" level user to perform the health check, otherwise some check items will fail and reduce the check efficiency
B. For gateway NEs, if you check the "If the NE to be loaded is a gateway NE, force FTP/SFTP protocol to load" configuration item, you need to configure an FTP/SFTP server on the network management server
C. “Force and activate
D. Check "Use package customization
View answer
Correct Answer: A
Question #23
If the OSN6800 device wants to achieve 1588V2 time synchronization, it must be configured with an electrical crossover board
A. TRUE
B. FALSE
View answer
Correct Answer: A
Question #24
Which of the following protections does N3EGS2 support?
A. TPS
B. PPS
C. BPScorrect
D. DLAG
View answer
Correct Answer: C
Question #25
Divide the ECC subnet.
A. 4321correct
B. 4213
C. 2314
D. 1234
View answer
Correct Answer: A
Question #26
Which step in the working principle of CORBA does getEventChannel belong to?
A. Session maintenance
B. Session Announcement
C. Information inquiry
D. Session initializationcorrect
View answer
Correct Answer: D
Question #27
The upgrade from GACSA to UXCSB for OSN 3500 equipment is as follows: 1. Replace the spare cross-connect board 2. Switching between active and standby cross-connect boards 3. Replace the original main cross board 4. Data consistency check
A. 2134
B. 4321
C. 4231
D. 1234
View answer
Correct Answer: D
Question #28
For 10G and coherent 100G mixed transmission systems, which of the following description is correct?
A. It is recommended to use long wavelengths for 10G channels and short wavelengths for 100G channels
B. Commissioning needs to be carried out according to the commissioning requirements of 100G, that is, non-standard in-fiber optical power commissioning method
C. For 100G single wave, due to the large dispersion tolerance, the dispersion compensation can be compensated according to the compensation principle of 10Gcorrect
D. The OSNR threshold of the 100G single board is basically the same as that of 10G, so the configuration of the amplifier board can be configured according to the 10G standard
View answer
Correct Answer: C
Question #29
Which of the following descriptions about PTN and TPS protection are correct? (Multiple choice)
A. The object of TPS protection is the interface boardcorrect
B. The object of TPS protection is the service sub-card and the motherboard on which the service sub-card is insertedcorrect
C. The service sub-card protected by TPS must use the interface board to go outcorrect
D. The interface board protected by TPS can be D12, D75, ETFC
E. The HARD_BAD alarm reported by the protected board will trigger TPS switchingcorrect
F. The BD_STATUS alarm reported on the protected board will trigger TPS switchingcorrect
View answer
Correct Answer: ABCEF
Question #30
The insertion loss of the 40 split-wave channels of D40 is 6dB. Without considering the influence of noise, when the signal is full, the optical power of the IN port of D40 is X dBm. If the optical power of the IN port is decreases by 1dB, the measured value of one of the output ports is 6dBm. (Assuming that the optical power of each channel is balanced, lg40=16)
A. (X-5)
B. (X-6)
C. (X-22)
D. (X-23)correct
View answer
Correct Answer: D

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