Jan-2022 Huawei H31-311-ENU Certification Real 2022 Mock Exam
H31-311-ENU Exam Questions and Valid PMP Dumps PDF
NEW QUESTION 89
Which of the following is the meaning of SFD in the Ethernet frame structure?
- A. Preamble
- B. Frame check sequence
- C. Start frame delimiter
- D. Payload
Answer: C
NEW QUESTION 90
Which of the following bytes in the regenerator section overhead are associated with R-OOF and R-LOF? (Multiple Choice)
- A. B1
- B. B2
- C. A1
- D. A2
Answer: C,D
NEW QUESTION 91
PDM uses the polarization beam splitter to divide the laser into two perpendicular directions: x and y.
- A. FALSE
- B. TRUE
Answer: B
NEW QUESTION 92
The error correction capability of FEC is measured with the encoding gain.
Which of the following statements about the encoding gain is incorrect?
- A. When the BER is constant, the OSNR saved by the correction encoding is called encoding gain.
- B. The encoding gain of AFEC is larger than that of FEC.
- C. The encoding gain of the in band FEC is larger than that of the outband FEC.
- D. The error correction capability of FEC increases with the encoding gain.
Answer: C
NEW QUESTION 93
Which of the following is the multiplexing mode of SDH?
- A. Flexible mapping and asynchronous multiplexing
- B. Flexible mapping
- C. Flexible mapping and synchronous multiplexing
- D. Asynchronous multiplexing
Answer: C
NEW QUESTION 94
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. None of the above
- B. Auto-negotiation flow control mode
- C. Non-auto-negotiation flow control mode
- D. Both of the above
Answer: C
NEW QUESTION 95
Which of the following layers defines the protocols that control the network layer? The protocols of the layer work on logical links, that is end-to-end connections between two devices.
- A. Data link layer
- B. Transport layer
- C. Network layer
- D. Application layer
Answer: B
NEW QUESTION 96
Which of the following statements about clock sources is incorrect?
- A. Internal clock sources have the lowest priority because of their low precision.
- B. The same SSM protocol is selected for all NEs in a clock protection subnet.
- C. If the standard SSM protocol is enabled, you need to set the clock source ID.
- D. Generally, tributary clocks are not used as the clock sources of devices.
Answer: C
NEW QUESTION 97
According to the formula of "ODUk rate = 239/(239-k) x STM-N frame rate", the ODU4 rate is equal to 239/235 x STM-N frame rate.
- A. FALSE
- B. TRUE
Answer: A
NEW QUESTION 98
When the transmit end detects that the b6-b8 of the K2 byte is 110, it indicates that the () alarm is reported at the transmit end.
- A. R-LOS
- B. R-LOF
- C. MS-AIS
- D. MS-RDI
Answer: D
NEW QUESTION 99
When a fiber cut test is performed on a normal MSP ring, which of the following alarms is reported? (Multiple Choice)
- A. APSJNDI
- B. R-LOS
- C. BD STATUS
- D. TU-AIS
Answer: A,B
NEW QUESTION 100
The OSN 1500/2500/3500/7500 supports both DC and AC power inputs.
- A. FALSE
- B. TRUE
Answer: A
NEW QUESTION 101
Which of the following is the meaning of "L" in the optical module parameter "L-64.2"?
- A. Dispersion coefficient
- B. Transmission distance
- C. Receive wavelength
- D. Transmit wavelength
Answer: B
NEW QUESTION 102
Which of the following service levels cannot be selected during service configuration?
- A. VC4
- B. VC3
- C. VC12
- D. VC8
Answer: D
NEW QUESTION 103
The receive end performs BIP-8 check for the unscrambled STM-16 frame. If the BIP-8 check result XOR the value of the B1 byte contained in the following STM-16 frame is 10001100, it indicates that ( ) bit error blocks exist in the STM-16 frame.
- A. 0
- B. Unclear
- C. 1
- D. 2
Answer: A
NEW QUESTION 104
The SL64 board can be used in an OSN 2500.
- A. FALSE
- B. TRUE
Answer: A
NEW QUESTION 105
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. FALSE
- B. TRUE
Answer: A
NEW QUESTION 106
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