H31-321 Online Practice Questions and Answers

After the alarm inversion function is enabled, board alarm status, including alarm indicators, will change, and the alarm status data on the NE and on the NMS will be updated accordingly.

A. TRUE

B. FALSE

No fiber connections exist between three rings. The gateway NEs of the three rings are connected to the NMS using different network cables but through the same HUB. What can you do to isolate ECC communication between the gateway NEs?

A. Disable extended ECC on the three gateway NEs.

B. Disable the OSI protocol on the three gateway NEs.

C. Disable DCC access on the three gateway NEs.

D. Delete the DCC transparent transmission bytes on the three gateway NEs.

According to the extended SSM protocol, clock switching is performed firstly according to clock priorities, and secondly according to clock quality levels.

A. TRUE

B. FALSE

On a normal network, clock protection switching fails after the clock synchronization path is interrupted. As a result, lots of pointer justification events occur on related NEs. What are the possible causes for the failure of clock protection switching?

A. Incorrect fiber connections between boards

B. Optical power is incorrect.

C. The clock tracing modes are incorrect.

D. The network-wide clock protection switching protocols are incorrectly configured.

E. Hardware faults

What may cause the HP_LOM alarm?

A. Services are not configured on upstream NEs.

B. The service level is set inconsistently at both ends.

C. The C2 byte to be transmitted on the terminal NE is 0x00, and the pass-through NEs are set to pass through the overhead.

D. The board (for example, a cross-connect board) is faulty, resulting in loss of the H4 byte or incorrect H4 byte.

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.

On NG-SDH equipment, when a cross-connect board that is configured with equipment-level protection (such as TPS, BPS, PPS, and DLAG) is replaced, the services carried by the board will not be interrupted.

A. TRUE

B. FALSE

What are required to collect networking information during daily equipment maintenance of MSTP equipment?

A. Obtain the network topology diagram.

B. Check whether the network involves interconnection with third-party equipment. If such interconnection exists, check for configuration precautions and compatibility requirements.

C. Obtain engineering design documents, including slot diagrams, fiber connection diagrams, mapping between NE name, NE ID, and NE IP addresses, equipment room layout, and ODF/DDF port distribution diagrams.

D. Obtain historical information blocks of preventive maintenance inspection.

E. Obtain equipment data backup information.