Free Access Huawei.H12-931-ENU.v2022-03-14.q118 Practice Test (Page 6)

Question 21

Which of the following are the background reasons for the introduction of coherent communication ()? (multiple choice)

A.When the baud rate is increased to 100Gbaud/s, the spectral width of the BPSK/DPSK pattern has exceeded 50GHz, and 50GHz interval transmission cannot be achieved

B.The conventional 40G DQPSK PMD is only 6~8ps. After the rate is upgraded to 100G, the PMD tolerance will be reduced by more than half, and it cannot support long-distance non-relay transmission.

C.For incoherent signals with a 40G data rate, a TDC module needs to be added to the receiving end, which has a slow response speed and does not support 1+1 protection scenarios, etc.

D.The biggest technical difficulty of coherence lies in high-performance FEC coding, and high-performance FEC coding is available in 2011

Question 22

The non-linear effect of the coherent signal is stronger than that of the 10G non-coherent, so the single-wave entering fiber optical power should be reduced. Therefore, during system commissioning, the OA gain can be reduced to reduce the single-wave output optical power of the OA to meet the fiber-in optical power requirements.

A.TRUE

B.FALSE

Question 23

An organization has built a network with 20 subnets and class C IP addresses. What is the subnet mask that should be used to configure the network correctly?

A.255.255.255.240

B.255.255.255.192

C.255.255.255.224

D.255.255.255.248

Question 24

Regarding the reporting of the OTUk_BDI alarm, the following statement is wrong.

A.The corresponding OTU board of the downstream station receives OTUk_SSF

B.Only the WDM side port will report OTUk_BDI

C.The downstream station's corresponding OTU board receives OTUk_AIS

D.The downstream station's corresponding OTU board receives OTUk_TIM

Question 25

For NG-SDH equipment equipped with dual main control, when the main control board is upgraded, which of the following statements is correct?

A.First complete the upgrade of the standby main control board, and then perform a hard reset on the current active main control board to switch between the main and standby main control boards, and then upgrade the current standby main control board

B.After the backup main control board has been upgraded first, the original main control can be upgraded only by switching between the main and the backup.

C.Directly upgrade the main control board first, and then upgrade the standby main control board

D.Upgrade the main main control board first, and then upgrade the standby main control board in the same way

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Question 21

Question 22

Question 23

Question 24

Question 25

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