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Latest Huawei H31-311 Exam Questions and Answers, 2025 Update | SPOTO

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Question #1
When a bridge uses the IVL learning mode, the entry in the MAC address table is created according to the source MAC address and source port of the data frame. This entry is valid for all VLANs.
A. TRUE
B. FALSE
View answer
Correct Answer: B
Question #2
The clock unit can access an external clock source as the timing signal source of the system only through the external clock interface. In addition, it can output the processed clock and provide the clock source for other devices that require timing.
A. TRUE
B. FALSEcorrect
View answer
Correct Answer: B
Question #3
When the PM segment of the ODUk generates seriously errored seconds, the network management will report the ODUk_PM_ES alarm.
A. True
B. Falsecorrect
View answer
Correct Answer: B
Question #4
The current sparse wavelength division multiplexing system generally operates in the band from 1271nm to 1611nm. Which of the following is the channel spacing?
A. 10nm
B. 5nm
C. 20nmcorrect
D. 18nm
View answer
Correct Answer: C
Question #5
All bytes in the SDH frame structure will be scrambled.
A. True
B. Falsecorrect
View answer
Correct Answer: B
Question #6
Which of the following is the frame whose VC-4 J1 byte is indicated by the current frame's AU pointer?
A. Current frame
B. Next framecorrect
C. Previous frame
D. None of the above
View answer
Correct Answer: B
Question #7
Complex flow classification refers to classifying packets according to the ToS (Type of Service ) field of IP packets , user priority or EXP field of MPLS packets to identify traffic with different priority characteristics.
A. True
B. Falsecorrect
View answer
Correct Answer: B
Question #8
STM-N signals must be scrambled when transmitted on the line, mainly to facilitate the receiving end to extract the line timing signal. All bytes in the SDH frame structure will be scrambled.
A. Truecorrect
B. False
View answer
Correct Answer: A
Question #9
Which of the following reasons will not cause the network management to report a MUT_LOS alarm?
A. OTU board failurecorrect
B. DMUX board out port failure
C. The pigtail connecting the DMUX board out port and the OA board in port is faulty
D. OA board in port failure
View answer
Correct Answer: A
Question #10
MPLS is a label forwarding technology, which of the following was originally designed for?
A. Increase the utilization rate of IP addresses
B. Increase the forwarding speed of the routercorrect
C. Reduce network latency
D. Avoid broadcast storms
View answer
Correct Answer: B
Question #11
Which of the following statements about the multiplex section remote error indication (MS-REI) is correct? ① The B2 byte indicates the transmission channel. ② The M1 byte indicates the transmission channel. ③ MS-REI is transmitted from the sink to the source. ④ MS-REI is transmitted from the source to the sink. ⑤ Indicates the number of detected bit errors after the sink receives the MS signals.
A. ①④⑤
B. ②④⑤
C. ①③⑤
D. ②③⑤correct
View answer
Correct Answer: D
Question #12
Which of the following alarms is not a switching condition for a two- fiber bidirectional multiplex section protection ring?
A. R_LOS
B. MS_AIS
C. TU_AIScorrect
D. B2_EXC
View answer
Correct Answer: C
Question #13
TM is a terminal multiplexer. Its function is: the line port inputs/outputs one STM-N signal, and the branch port can output/input multiple low-speed branch signals.
A. Truecorrect
B. False
View answer
Correct Answer: A
Question #14
The negative adjustment position of the TU pointer is at which of the following bytes?
A. V1
B. V2
C. V3correct
D. V4
View answer
Correct Answer: C
Question #15
Both QinQ and MPLS can provide users with L2 VPN service, but QinQ is cheaper and easier than MPLS.
A. Truecorrect
B. False
View answer
Correct Answer: A
Question #16
Which of the following descriptions about the FIU board is correct?
A. The FIU board processes monitoring information
B. FIU can complete the access and extraction of OSC channels
C. In the OptiX OSN8800 equipment, when there is no signal input, the FIU board will report an alarm
D. Whether it is an OLA station or an OADM station, one station only needs one FI
View answer
Correct Answer: B
Question #17
The frame structure of ODU4 is four times that of ODU1.
A. True
B. Falsecorrect
View answer
Correct Answer: B
Question #18
What are the differences between the AU pointer and the TU pointer? (Multiple choice)
A. The scope of the instruction is differentcorrect
B. The number of bits occupied by the pointer value is different
C. The bytes stored in the pointer value are differentcorrect
D. The unit of adjustment is differentcorrect
View answer
Correct Answer: ACD
Question #19
MPLS is not a service or application, it is actually a tunnel technology.
A. Truecorrect
B. False
View answer
Correct Answer: A
Question #20
Which of the following can be the center wavelengths of the pump sources in an EDFA? (Multiple Choice)
A. 1480 nm
B. 1510 nm
C. 1310 nm
D. 980 nm
View answer
Correct Answer: AD
Question #21
If you group SNCP services with the same source, sink, or route, you can increase the SNCP switching speed
A. True
B. Error
View answer
Correct Answer: A
Question #22
Compared with traditional SDH and SONET equipment, which of the following advantages does OTN have? (Multiple choice)
A. Meet the transmission bandwidth requirements of each optical Tb/s through the wavelength division functioncorrect
B. Provide 2
C. Provide up to 5 levels of nested overlapping TCM connection monitoring
D. Support virtual concatenation transmission mode to improve and optimize the network structurecorrect
E. Provide a powerful out-of-band FEC function, which effectively guarantees the line transmission performancecorrect
View answer
Correct Answer: ABDE
Question #23
Which of the following statements about the 1+1 protection of cross-connect boards are correct? (Multiple Choice)
A. The source service board sends services to the active and standby cross-connect boards
B. After service cross-connections are completed, the active and standby cross-connect boards send the data of the active cross-connect board to the sink service board
C. The sink service board can receive only the data from the active cross-connect board
D. The buses of the two cross-connect modules work independently and do not interfere with each other
E. The dual-bus system structure indicates that the service board performs dual feeding of data to the cross-connect side and selective receiving of the data on the cross-connect side
F. Two cross-connect boards have the same configuartion
View answer
Correct Answer: ADEF
Question #24
Physical port: also known as MAC port, which is the external port of the board.
A. Truecorrect
B. False
View answer
Correct Answer: A
Question #25
When LCK is inserted into the local ODUk signal, which processing will the downstream station system not perform?
A. Report ODUk_PM_LCK alarm
B. Insert DDUK_AIS information
C. Return DDUk_PM_BDI
D. Insert DDUk_PM_LCK alarmcorrect
View answer
Correct Answer: D
Question #26
Physical port: also known as MAC port, is the external port of the board.
A. Truecorrect
B. False
View answer
Correct Answer: A
Question #27
Which of the following options are in the low-loss area of single-mode fiber? (Multiple choice)
A. 1310nm _correct
B. 900nm
C. 1550nmcorrect
D. 1200nm
View answer
Correct Answer: AC
Question #28
If a bit error is detected in the B2 byte, the peer end will report the following alarm.
A. MS-AIS
B. RS-BBE
C. MS-FEBBEcorrect
D. MS-BBE
View answer
Correct Answer: C
Question #29
For the OSN6800 device, which of the following slots does not have an electrical layer crossover backplane bus?
A. Slot1correct
B. SIot9
C. SIot10
D. SIot17correct
View answer
Correct Answer: AD
Question #30
Which of the following is related to pointer adjustment?
A. clockcorrect
B. Speed
C. Expenses
D. Scrambling
View answer
Correct Answer: A

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