Huawei Huawei Certifications H31-321 Questions & Answers

• Question 31:

  When protection switching of services occurs on ASON tunnels, which of the following are involved in the entire protection process?

  A. NMS software

  B. ASON software

  C. NE software

  D. Board software

  Correct Answer: BC

• Question 32:

  What are the characteristics of a trail?

  A. A trail is a end-to-end connection.

  B. A trail has a source and a sink.

  C. A trail may pass through many intermediate nodes.

  D. A trail must be bidirectional.

  Correct Answer: ABC

• Question 33:

  Which of the following are false about service protection and restoration on an ASON network?

  A. Typically, services are protected using the pre-allocated resources between NEs, These resources cannot be shared on the entire network.

  B. Generally, services are restored using any resource between NEs.

  C. Generally, protection switching time is less than 50 ms. During service rerouting, service routes need to be re-calculated. Therefore, service restoration time is longer, and a service can be restored in seconds.

  D. When the route of a service fails, the network automatically seeks a substitute route, and the service restoration algorithm is different from the route selection algorithm.

  E. To enable the service restoration function on an ASON network, you need to reserve some idle resources for service rerouting. Services are restored in rerouting mode on an ASON network.

  Correct Answer: ABCE

• Question 34:

  A port of an NG-SDH NE is currently free from alarms. You can enable the alarm inversion function on the port and set the reversion mode to auto-revertive.

  A. TRUE

  B. FALSE

  Correct Answer: B

• Question 35:

  What working modes are supported by clocks of an SDH NE?

  A. Synchronizing

  B. Tracing

  C. holdover

  D. Free-run

  Correct Answer: BCD

• Question 36:

  Which of the following are true about clocks?

  A. Clock synchronization mode can be classified into pseudo synchronization and master-slave synchronization.

  B. On an SDH network, a downstream node extracts timing signals from line signals and obtains the clock quality level from bits 5 to 8 of the SI byte.

  C. If bits 5 to 8 of the SI byte returned by a downstream node take the value of Oxf, the clock source is valid.

  D. As defined by the extended SSM protocol, clock ID is bits 1 to 4 of the SI byte.

  E. In the extended SSM protocol, clock ID 0 indicates highest priority.

  Correct Answer: ABD

• Question 37:

  What tools are required for board replacement during equipment-side maintenance?

  A. ESD wrist strap or ESD gloves

  B. Shielding bag

  C. Screwdriver

  D. U2000

  E. Optical power meter

  Correct Answer: ABCD

• Question 38:

  Which of the following is not the daily basic maintenance operation on the U2000?

  A. Browsing the current alarms

  B. Checking the communication between the U2000 and NEs

  C. Querying the security logs of the U2000

  D. Checking the disk space of the U2000 server

  Correct Answer: D

• Question 39:

  The suppression function can be enabled for all alarm of an NE or a board. When an alarm is suppressed, the corresponding NE or board does not monitor this alarm.

  A. TRUE

  B. FALSE

  Correct Answer: A

• Question 40:

  You need to plan the MS when gold services exist on an ASON network. Which of the following are true about MS planning?

  A. If only a few gold services exist, upgrade the gold services to diamond services.

  B. The MS should cover all nodes on which gold services are required to be configured. Multiple MSs can be used to cover more nodes on a complex network.

  C. If the gold services take up less than half of the optical path resources, set part of the MS for the gold services, in other words, only part of the VC-4 resources on the MS are allocated for the gold services.

  D. Services should be evenly distributed in an MS. Avoid high bandwidth utilization in certain portion of an MS but low bandwidth utilization in other portion of the MS.

  Correct Answer: BCD