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Free Huawei H31-311 Practice Questions & Answers 2026 Part1 | HCIA-Transmission

Are you preparing for the Huawei H31-311 certification exam? SPOTO offers the Huawei H31-311 Premium File; all questions are aligned with the latest exam content and come with expert-provided answers. Our question banks cover the latest question types, core concepts, and detailed explanations, helping you familiarize yourself with the exam format and difficulty level. Whether you are reviewing core concepts or simulating a real exam environment, these resources will rapidly boost your confidence and readiness.
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Question #1
The clock unit can only access the external clock source as the timing signal source of the system through the external clock interface. In addition; It can also output a processed clock and provide a clock source for other devices that need timing.
A. True
B. False
View answer
Correct Answer: B
Question #2
When the bridge uses ivl learning mode, an entry in the MAC address table is created based on the source MAC address and source port of the teach frame. This entry applies to all VLANs
A. True
B. False
View answer
Correct Answer: B
Question #3
When a fiber cut test is performed on a normal MSP ring, which of the following alarms is reported? (Multiple Choice)
A. TU - AIS
B. R - LOS
C. APSJNDI
D. BD STATUS
View answer
Correct Answer: BC
Question #4
Measure the False correction capability of fec with encoded gain. Which of the following statements about the coding gain is incorrect?
A. When ber is constant, the OSNR saved by correcting the encoding is called the encoding gain
B. The False correction capability of B
C. The coding gain of the in-band FEC is greater than the coding gain of the out-of-band FEC
D. The coding gain of D
View answer
Correct Answer: C
Question #5
Compared with dense wavelength division multiplexing (DWDM) systems, crude glass division multiplexing (CWDM) systems provide a certain amount of glass length and transmission distance within (kmkm), which greatly reduces system cost and has strong flexibility
A. 50
B. 100
C. 200
D. 20
View answer
Correct Answer: B
Question #6
The frame structure of 0DU4 is four times that of ODU1.
A. TRUE
B. FALSE
View answer
Correct Answer: B
Question #7
When using the LCAS function, which of the following overhead bytes is used to transmit control information? (Multiple Choices)
A. M1
B. H4
C. K2
D. K4
View answer
Correct Answer: BD
Question #8
The rates of the SF64 and SL64 boards are both STM-64. Therefore, the two boards can be interconnected.
A. TRUE
B. FALSE
View answer
Correct Answer: B
Question #9
Which of the following is not a non-linear effect?
A. APMD
B. BSPM
C. CSRS
D. DFWM
View answer
Correct Answer: A
Question #10
In the 2.5G MSP ring consisting of four MSTP sites, when a protection switching occurs, which of the following statements about the alarm reporting is correct?
A. The PS alarm is reported on the tributary board
B. The APS-INDI alarm is reported on the XCS board
C. The APS-INDI alarm is reported on the system control board
D. The APS-INDI alarm is reported on the line board
View answer
Correct Answer: B
Question #11
When a fiber cut test is performed on a normal MSP ring, which of the following alarms is reported? (Multiple Choice)
A. TU-AIS
B. R-LOS
C. APSJNDI
D. BD STATUS
View answer
Correct Answer: BC
Question #12
The dual fiber ring topology consisting of three network elements is arranged in counterclockwise order as the service between A, B and C A and C occupies the first VC-48 on the short path VC-12 time slots, B and C of the same service also occupy the 48th of the first VC-4 on the short path VC-12 time slots
A. Unidirectional path protection ring
B. SNCP ring
C. Bidirectional MSP ring
D. All of the above
View answer
Correct Answer: C
Question #13
Which factors determine the optical signal-to-noise ratio (OSNR) of the receiving end to a certain extent After the signal transmission in the WOM system is transmitted over a certain distance, the "oSNR" of the receiving end of the optical signal-to-noise ratio is reduced to a certain extent. Which of the following is the main cause?
A. Use EDFA
B. Use of multi-density multiplexers and multiplexers
C. Do not use new optical fibers
D. Optical fiber attenuation is too high
View answer
Correct Answer: A
Question #14
Which of the following statements regarding the sequence of signal flows between the SDH interface and the cross-connecting unit is correct?
A. SPI <> RST <> MST <> MSP<> MSA <> HPT
B. SPI <> RST <> MSA<> MSP<> MST <> HPT
C. SPI <> MST<> RST <> MSA <> MSP >HPT
D. SPT<> MS <> MSA<> RST > MSP<> HPT
View answer
Correct Answer: A
Question #15
There are 48 bits in MAC address. The first ( ) bits make up a unique identifier for the vendor and the last ( ) bits are allocated by the vendor
A. 16, 32
B. 24,24
C. 8,40
D. 32, 16
View answer
Correct Answer: B
Question #16
K1 and K2 bytes can send APS switching signaling or indicate that the multiplexed segment signal is invalid.
A. True
B. Error
View answer
Correct Answer: A
Question #17
The dual fiber ring topology consisting of three network elements is arranged in counterclockwise order as the service between A, B and C A and C occupies the first VC-48 on the short path VC-12 time slots, B and C of the same service also occupy the 48th of the first VC-4 on the short path VC-12 time slots
A. Unidirectional path protection ring
B. SNCP ring
C. Bidirectional MSP ring
D. All of the above
View answer
Correct Answer: C
Question #18
Which of the following is the frame indicated by the VC-4 J1 byte by the AU pointer of the current frame?
A. Current framework
B. Next frame
C. Previous frame
D. None of the above
View answer
Correct Answer: B
Question #19
The standard Ethernet frame length should not be less than 64 bytes Which of the following factors contribute to this limitation? (Multiple choice).
A. Minimum transmission distance
B. Maximum transmission distance
C. How conflict detection works
D. MAC address
View answer
Correct Answer: BC
Question #20
In a 2.5GMSP ring consisting of four MSTP sites, which of the following statements about alarm reports is correct when a protection switchover occurs?
A. PS Alarms are reported on the tributary board
B. APS-INDI alarms are reported on the xCS board
C. Report APS-INDl alerts on the system dashboard
D. Report APS-INDI alarms on the board
View answer
Correct Answer: B
Question #21
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 Ml 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. 1 , 4 , 5
B. 2 , 4 , 5
C. 1 , 3 , 5
D. 2 , 3 , 5
View answer
Correct Answer: D
Question #22
Which of the following statements regarding the sequence of signal flows between the SDH interface and the cross-connecting unit is correct?
A. SPI <> RST <> MST <> MSP<> MSA <> HPT
B. SPI <> RST <> MSA<> MSP<> MST <> HPT
C. SPI <> MST<> RST <> MSA <> MSP >HPT
D. SPT<> MS <> MSA<> RST > MSP<> HPT
View answer
Correct Answer: A
Question #23
K1 and K2 bytes can send APS switching signaling or indicate that the multiplexed segment signal is invalid.
A. True
B. Error
View answer
Correct Answer: A
Question #24
When configuring LMSP, there are two switching modes: single-ended switching and double-endedswitching. Single-ended switching does not require the protection protocol to be enabled.
A. rue
B. alse
View answer
Correct Answer: A
Question #25
NE A and NE B are adjacent NEs. If B3 and lower-order bit errors occur in the A->B direction and B1, B2, B3, and lower-order bit errors occur in the B->A direction, which of the following performance events are reported by NE A? (Multiple Choice)
A. RSBBE
B. RSFEBBE
C. MSBBE
D. MSFEBBE
E. HPBBE
F. HPFEBBE
View answer
Correct Answer: ACEF
Question #26
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. FALSE
View answer
Correct Answer: B
Question #27
The dual fiber ring topology consisting of three network elements is arranged in counterclockwise order as the service between A, B and C A and C occupies the first VC-48 on the short path VC-12 time slots, B and C of the same service also occupy the 48th of the first VC-4 on the short path VC-12 time slots
A. Unidirectional path protection ring
B. SNCP ring
C. Bidirectional MSP ring
D. All of the above
View answer
Correct Answer: C
Question #28
The working mode of a port determines the flow control mode of the port.When the working mode is 100 Mbit/s full duplex, which of the following flow control modes can be used?
A. Auto-negotiation flow control mode
B. Non-auto-negotiation flow control mode
C. Both of the above
D. None of the above
View answer
Correct Answer: B
Question #29
In the 2.5G MSP ring consisting of four MSTP sites, when a protection switching occurs, which of the following statements about the alarm reporting is correct?
A. The PS alarm is reported on the tributary board
B. The APS-INDI alarm is reported on the XCS board
C. The APS-INDI alarm is reported on the system control board
D. The APS-INDI alarm is reported on the line board
View answer
Correct Answer: B
Question #30
The standard Ethernet frame length should not be less than 64 bytes Which of the following factors contribute to this limitation? (Multiple choice).
A. Minimum transmission distance
B. Maximum transmission distance
C. How conflict detection works
D. MAC address
View answer
Correct Answer: BC
Question #31
NE A and NE B are adjacent NEIf B3 and low-order errors occur in the A->B direction, and B1, B2, B3, and low-order errors occur in the B->A direction, it is caused by Which of the following performance events does NEA report? (Multiple choice).
A. RSBEE
B. RSFEBE
C. MSBBE
D. MSFEBBE
E. HPBBE
F. HPFEBBE
View answer
Correct Answer: ACEF
Question #32
Which of the following bytes can be used for the orderwire phone between two REG devices?
A. 1
B. 1 and E2
C. one of the above
D. 2
View answer
Correct Answer: A
Question #33
Which of the following ITLI-T recommendations define the OTN frame structure?
A. G
B. G
C. G
D. G
View answer
Correct Answer: D
Question #34
Which of the following options is emitted from an ordinary light source, which has all possible vibration directions and is symmetrical to the direction of light propagation?
A. olarized light
B. olarization
C. olarization
D. atural light
View answer
Correct Answer: D
Question #35
In a WDM system, using a dielectric thin film filter (TFF) is ideal when fewer than ( ) wavelengths are used.
A. 4
B. 8
C. 16
D. 20
View answer
Correct Answer: C
Question #36
Optical monitoring channel is used for monitoring of WDM optical transmission systems. In the UU-T recommendation, it is preferable to use a 1510 nm wavelength of the a ") rate.
A. 64 kbit/s
B. 192 kbit/st
C. 2 Mbit/s
D. 5676 kbit/s
View answer
Correct Answer: C
Question #37
The 1510nm optical monitoring channel can be effectively amplified after passing through EDFA.
A. rue
B. alse
View answer
Correct Answer: B
Question #38
When performing fiber cut-off test on an ordinary MSP ring, which of the following alarms will be reported? (Multiple choice).
A. YOU-AIS
B. R-LOS
C. APSJNDl
D. BD
View answer
Correct Answer: BC
Question #39
The device IP address of the gateway element and the non-gateway element must be set in the same network segment.
A. True
B. Error
View answer
Correct Answer: B
Question #40
Which of the following is not an optical-layer board?
A. Optical multiplexer board
B. Optical supervisory board
C. Optical transponder board
D. Optical add/drop multiplexing board
View answer
Correct Answer: B
Question #41
Which of the following ITLI-T recommendations define the OTN frame structure?
A. G
B. G
C. G
D. G
View answer
Correct Answer: D
Question #42
When the number of block errors detected by the B2 byte received at the recerve end is returned to the transmit end through the Ml byte, which of the following alarms or performance events are reported at the transmit end?
A. MS_FEBBF
B. MS_AIS
C. MS_REI
D. MS_BBF
View answer
Correct Answer: AC
Question #43
In the 2.5G MSP ring consisting of four MSTP sites, when a protection switching occurs, which of the following statements about the alarm reporting is correct?
A. The PS alarm is reported on the tributary board
B. The APS-INDI alarm is reported on the XCS board
C. The APS-INDI alarm is reported on the system control board
D. The APS-INDI alarm is reported on the line board
View answer
Correct Answer: B
Question #44
Which of the following is the frame indicated by the VC-4 J1 byte by the AU pointer of the currentframe?
A. urrent framework
B. ext frame
C. revious frame
D. one of the above
View answer
Correct Answer: B
Question #45
Which of the following statements regarding the sequence of signal flows between the SDH interface and the cross-connecting unit is correct?
A. SPI <> RST <> MST <> MSP<> MSA <> HPT
B. SPI <> RST <> MSA<> MSP<> MST <> HPT
C. SPI <> MST<> RST <> MSA <> MSP >HPT
D. SPT<> MS <> MSA<> RST > MSP<> HPT
View answer
Correct Answer: A
Question #46
Which of the following is the basic requirement of DWDM system on the light source?
A. utput wavelength is stable
B. igh transmission power
C. sing direct modulation method
D. ow dispersion tolerance
View answer
Correct Answer: A
Question #47
NE A and NE B are adjacent NEs. If B3 and lower-order bit errors occur in the A->B direction and B1, B2, B3, and lower-order bit errors occur in the B->A direction, which of the following performance events are reported by NE A? (Multiple Choice)
A. RSBBE
B. RSFEBBE
C. MSBBE
D. MSFEBBE
E. HPBBE
F. HPFEBBE
View answer
Correct Answer: ACEF
Question #48
Manual configuration will clear data on the NE side.
A. TRUE
B. FALSE
View answer
Correct Answer: A
Question #49
The dual fiber ring topology consisting of three network elements is arranged in counterclockwise order as the service between A, B and C A and C occupies the first VC-48 on the short path VC-12 time slots, B and C of the same service also occupy the 48th of the first VC-4 on the short path VC-12 time slots
A. Unidirectional path protection ring
B. SNCP ring
C. Bidirectional MSP ring
D. All of the above
View answer
Correct Answer: C
Question #50
The SNCP switching speed can be improved if you classify the SNCP services that have the same source, sink, or route into groups.
A. TRUE
B. FALSE
View answer
Correct Answer: A
Question #51
Which of the following statements about the optical-layer interfaces OTM-n.m and OTM-nr.m of OTN is incorrect?
A. n indicates the number of wavelengths carried by the maximum capacity
B. m indicates the rate
C. r indicates OTM without the OSC function
D. OTM-nr
View answer
Correct Answer: B
Question #52
K1 and K2 bytes can send APS switching signaling or indicate that the multiplexed segment signal is invalid.
A. True
B. Error
View answer
Correct Answer: A
Question #53
TU-AIS is often encountered during network maintenance. Which of the following alerts can trigger a TU-AIS alert? (Multiple choice).
A. AU-LOP
B. R-LOS
C. HP-TIM
D. B2-EXC
View answer
Correct Answer: ABCD
Question #54
K1 and K2 bytes can send APS switching signaling or indicate that the multiplexed segment signal is invalid.
A. True
B. Error
View answer
Correct Answer: A
Question #55
The frame structure of 0DU4 is four times that of ODU1.
A. TRUE
B. FALSE
View answer
Correct Answer: B
Question #56
Which of the following is the functional unit that provides a high-speed signal interface and processes the corresponding signal?
A. Cross-connecting unit
B. Auxiliary units
C. Tributary units
D. Line units
View answer
Correct Answer: D
Question #57
K1 and K2 bytes can send APS switching signaling or indicate that the multiplexed segment signal is invalid.
A. True
B. Error
View answer
Correct Answer: A
Question #58
Which of the following statements about the OTM-n .m and OTMnr .m for OTN are incorrect?
A. n represents the number of wavelengths carried by the maximum capacity
B. m indicates the rate
C. r represents OTM
D. OTM-nr
View answer
Correct Answer: B
Question #59
Which of the following is the functional unit that provides a high-speed signal interface and processes the corresponding signal?
A. Cross-connecting unit
B. Auxiliary units
C. Tributary units
D. Line units
View answer
Correct Answer: D
Question #60
The U2000 can be flexibly interconnected with different third-party NMSs through northbound interfaces (NBIs), and provides information about physical inventory and alarms to the upper-layer NMSs.
A. ALSE
B. RUE
View answer
Correct Answer: B
Question #61
Which of the following is the functional unit that provides a high-speed signal interface and processes the corresponding signal?
A. Cross-connecting unit
B. Auxiliary units
C. Tributary units
D. Line units
View answer
Correct Answer: D
Question #62
NE A and NE B are adjacent NEs. If B3 and lower-order bit errors occur in the A->B direction and B1, B2, B3, and lower-order bit errors occur in the B->A direction, which of the following performance events are reported by NE A? (Multiple Choice)
A. RSBBE
B. RSFEBBE
C. MSBBE
D. MSFEBBE
E. HPBBE
F. HPFEBBE
View answer
Correct Answer: ACEF
Question #63
QinQ technology can be used when multiple users need to share the same VCTRUK and use the sameVLAN ID.
A. rue
B. alse
View answer
Correct Answer: A
Question #64
The transmission network does not produce information, it only transmits services.
A. RUE
B. ALSE
View answer
Correct Answer: A
Question #65
Which of the following ITLI-T recommendations define the OTN frame structure?
A. G
B. G
C. G
D. G
View answer
Correct Answer: D
Question #66
The dual fiber ring topology consisting of three network elements is arranged in counterclockwise order as the service between A, B and C A and C occupies the first VC-48 on the short path VC-12 time slots, B and C of the same service also occupy the 48th of the first VC-4 on the short path VC-12 time slots
A. Unidirectional path protection ring
B. SNCP ring
C. Bidirectional MSP ring
D. All of the above
View answer
Correct Answer: C
Question #67
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. ALSE
B. RUE
View answer
Correct Answer: A
Question #68
The 1510nm optical monitoring channel can be effectively amplified after passing through EDF
A.
B. True
C. False
View answer
Correct Answer: B
Question #69
The dual fiber ring topology consisting of three network elements is arranged in counterclockwise order as the service between A, B and C A and C occupies the first VC-48 on the short path VC-12 time slots, B and C of the same service also occupy the 48th of the first VC-4 on the short path VC-12 time slots
A. Unidirectional path protection ring
B. SNCP ring
C. Bidirectional MSP ring
D. All of the above
View answer
Correct Answer: C
Question #70
K1 and K2 bytes can send APS switching signaling or indicate that the multiplexed segment signal is invalid.
A. True
B. Error
View answer
Correct Answer: A
Question #71
Which of the following statements regarding the protection of the cross-connecting plate 1+1 is correct? (Multiple choice).
A. The source business board sends services to the main and standby crossover boards
B. After the service cross-connection is completed, the active and standby cross-board sends the data of the primary cross-board to the receiving service board
C. The receiving service board can only receive data from the active cross-link board
D. The bus of the two cross-connected modules works independently and does not interfere with each other
E. Dual bus system structure indicates that the service board performs dual data transfer to the cross- connection side and selectively receives data on the cross-connection side
F. Both cross-connecting plates have the same configuration
View answer
Correct Answer: ADEF
Question #72
Which of the following statements about clock sources is wrong?
A. enerally, the tributary clock is not used as the clock source for the device
B. he internal clock source has the lowest priority due to its low accuracy
C. elect the same SSM protocol for all NEs in the clock protection subnet
D. f the standard SSM protocol is enabled, you need to set the clock source ID
View answer
Correct Answer: D
Question #73
Which of the following is the electrical layer cost of OTN? (Multiple choice).
A. OPUk
B. ODUk
C. och
D. OTUR
View answer
Correct Answer: ABD
Question #74
According to the formula "ODUk rate = 239/(239k) x STM-N frame rate", ODU4 The rate is equal to the 239/235xSTM-N Pa rate.
A. True
B. False
View answer
Correct Answer: B
Question #75
Manual configuration will clear data on the NE side.
A. TRUE
B. FALSE
View answer
Correct Answer: A
Question #76
The dual fiber ring topology consisting of three network elements is arranged in counterclockwise order as the service between A, B and C A and C occupies the first VC-48 on the short path VC-12 time slots, B and C of the same service also occupy the 48th of the first VC-4 on the short path VC-12 time slots
A. Unidirectional path protection ring
B. SNCP ring
C. Bidirectional MSP ring
D. All of the above
View answer
Correct Answer: C
Question #77
The rates of the SF64 and SL64 boards are both STM-64. Therefore, the two boards can be interconnected.
A. TRUE
B. FALSE
View answer
Correct Answer: B
Question #78
In the 2.5G MSP ring consisting of four MSTP sites, when a protection switching occurs, which of the following statements about the alarm reporting is correct?
A. The PS alarm is reported on the tributary board
B. The APS-INDI alarm is reported on the XCS board
C. The APS-INDI alarm is reported on the system control board
D. The APS-INDI alarm is reported on the line board
View answer
Correct Answer: B
Question #79
The rates of the SF64 and SL64 boards are both STM-64. Therefore, the two boards can be interconnected.
A. TRUE
B. FALSE
View answer
Correct Answer: B
Question #80
The dual fiber ring topology consisting of three network elements is arranged in counterclockwise order as the service between A, B and C A and C occupies the first VC-48 on the short path VC-12 time slots, B and C of the same service also occupy the 48th of the first VC-4 on the short path VC-12 time slots
A. Unidirectional path protection ring
B. SNCP ring
C. Bidirectional MSP ring
D. All of the above
View answer
Correct Answer: C

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