Huawei H31-331 問題集

質問 1：
In the NG WDM network, Ethernet service degradation occurs.
Which of the following are possible reasons? (multiple choice)
A. Physical layer failure
B. When the traffic is too large, the peer device does not have time to respond.
C. Large amount of traffic and insufficient bandwidth configuration
D. Line fiber failure
E. The port attribute does not match the peer device.
F. Ample bandwidth and large bursts of business
正解：A,B,C,E,F

質問 2：
OTU is one of the important components of the WDM system. Which of the following is wrong about OTU?
A. The most basic function of the originating OTU is to perform wavelength conversion to convert the wavelength of the signal that is not suitable for WDM system transmission to the wavelength that meets the transmission requirements of the WDM system.
B. The greater the dispersion tolerance of the transmitter, the farther the signal can transmit without dispersion compensation.
C. Sensitivity and overload point are important parameters/indicators for measuring the OTU receiver. The sensitivity of the PIN receiver is better than that of the APD.
D. -20dB spectral width, side mode suppression ratio, center wavelength, frequency offset, etc. are all important parameters or indicators to measure the OTU wave side transmitter.
正解：C

質問 3：
Which of the following alarms triggers optical line protection switching in the optical line protection of the NG WDM 40G systems?
A. OTU3_PM_DEG
B. R_LOS
C. OTU3_LOF
D. MUT_LOS
正解：D

質問 4：
The application of the FEC-enabled wavelength conversion board in the DWDM system can improve the signal-to-noise ratio.
A. False
B. True
正解：A

質問 5：
For the aggregation type OTU board, when the ODUk_PM_AIS alarm is received on the WDM side of the receiving OTU board, the following describes the OTN standard signal processing, which is correct.
A. Generate SD events on the WDM side of the B station OTU, trigger channel service switching
B. No processing and reporting on this site
C. Return OTUk_BDI alarm to the wavefront side of the upstream station
D. After the alarm processing on the client side, the ODUk_PM_AIS alarm can be detected in the client device.
正解：D

質問 6：
For WDM devices, the smaller the channel spacing, the smaller the frequency offset allowed by the center frequency.
A. False
B. True
正解：B

質問 7：
During the troubleshooting process, if you need to perform loopback on the protected services carried by the NG WDM device, which of the following operations must be performed before performing the loopback operation?
A. Verify that the APS protocol is enabled
B. Switch to the protection channel
C. Is the test switching normal?
D. Locked in the current channel
正解：D