Huawei Huawei Certifications H31-321 Questions & Answers

• Question 121:

  Which of the following are true about TU pointer justification?

  A. The justification step of the TU pointer is three bytes.

  B. When VC-12 and TU-12 have no frequency or phase difference, the position of the V5 byte is 0.

  C. The value of the TU pointer is in the last 10 bits of the VI and V2 bytes.

  D. When VI and V2 are all "l"s, the local NE reports the TU-AIS alarm.

  Correct Answer: CD

• Question 122:

  What are the common causes for pointer justification?

  A. Clock sources or clock source levels are configured incorrectly. As a result, there are two clock sources on one network or a timing loop occurs. AU and TU pointers will adjust.

  B. The power supply for the subrack is faulty, resulting in abnormal operation of clock boards. AU and TU pointers will adjust.

  C. The cross-connect board is faulty, resulting in degraded clock quality. AU and TU pointers will adjust.

  D. The tributary board is faulty, resulting in justification of both AU and TU pointers.

  Correct Answer: ABC

• Question 123:

  In an SDH system, AU pointer justification events on most optical boards are detected through H1 and H2 bytes, namely, in remote detection mode.

  A. TRUE

  B. FALSE

  Correct Answer: A

• Question 124:

  Alarm suppression applies to intra-board alarms. When alarms of different severity levels are generated, the alarm of a higher severity level suppress the alarm of a lower severity level.

  A. TRUE

  B. FALSE

  Correct Answer: B

• Question 125:

  Latency of store-and-forward equipment is the difference between the time the first bit of a data frame enters the equipment and the time the first bit exits the equipment.

  A. TRUE

  B. FALSE

  Correct Answer: B

• Question 126:

  Which of the following about the conditions that trigger rerouting on NG-SDH equipment?

  A. R_LOS, R_LOF

  B. RSBBE, MSBBE

  C. MS_AIS, MS_RDI

  D. AU_AIS, AU_LOP

  E. HP_UNEQ, HP_LOM

  Correct Answer: ACD

• Question 127:

  A service created using the trail function will not become a discrete service.

  A. TRUE

  B. FALSE

  Correct Answer: A

• Question 128:

  Which of the following statements are true about fiber-shared virtual path protection?

  A. The VC-4 timeslots of an optical path allocated to an MSP ring and those allocated for an SNCP ring must be different.

  B. When the VC-4 timeslots of an optical path allocated to both an MSP ring and an SNCP ring are the same, services on the VC-4 timeslots have double protection.

  C. The VC-4 timeslots of an optical path allocated to two MSP rings must be different.

  D. When the VC-4 timeslots of an optical path allocated to two MSP rings are the same, services on the VC-4 timeslots have double protection.

  E. The VC-4 timeslots of an optical path allocated to two SNCP rings must be different.

  F. When the VC-4 timeslots of an optical path allocated to two SNCP rings are the same, services on the VC-4 timeslots have double protection.

  Correct Answer: ABCE

• Question 129:

  During normal operation of a network, the conditions that trigger a protection switching are generated on the working channel but services fail to be automatically switched to the protection channel. Services are interrupted, but the MS protocol status is normal on the NMS. What are the possible causes?

  A. Incorrect fiber connections between boards

  B. The cross-connect or line board is faulty.

  C. The configuration data on the NE and those on the NMS are inconsistent. As a result, the parameters of MSP nodes do not take effect.

  D. Equipment power failure

  E. The SCC board is faulty.

  Correct Answer: ABCD

• Question 130:

  In a board replacement scenario, an SDH board is configured with ring MSP. Which alarm will be reported after a forced switchover?

  A. APSJNDI

  B. APS_MANUAL_STOP

  C. R_APS

  D. APS_FAIL

  Correct Answer: A