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

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.

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

What are the purposes of SDH clock synchronization?

A. To ensure that all digital devices in a communication network works at the same nominal frequency

B. To minimize the effect of slips, burst bit errors, phase jumps, jitters, and wanders on digital communications systems

C. To minimize the need for pointer adjustment of SDH equipment

D. To enhance clock quality

E. To avoid clock loops

MSP and SNCP can coexist on a complex network. Which of the following statements are true?

A. Some timeslots have double protection.

B. By default, an SNCP switchover takes a shorter time than an MSP switchover.

C. Two SNCP switchovers will occur if SNCP holdoff time is not set.

D. Frequent switchovers do not affect services.

Which of the following operations are required for monthly basic maintenance on the U2000?

A. Checking for the time of the U2000 server

B. Backing up system files

C. Changing the password for a current user

D. Checking operating system logs

What is the purpose of setting SNCP holdoff time?

A. An SNCP switchover takes a longer time than an MSP switchover.

B. SNCP switching is reliable and efficient.

C. To prevent a second SNCP switching

D. None of the above

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

SDH equipment supports many protection types. Which of the following statements is false?

A. It is recommended that the working board be removed for a TPS test two minutes after TPS protection is configured, because it takes a period of time for the protocol to obtain the physical type of the processing board.

B. When 1+1 protection is configured for the power supply, each PIU board provides 50% of the required DC power. When one PIU board fails, the other also stops providing power.

C. The 1+1 protection switching between GSCC boards is non-revertive. Services can be switched back only by removing the working board or issuing a switching command on the U2000.

D. After you insert a GSCC board back, the working GSCC board needs to synchronize data to the newly inserted GSCC board. Wait 5 to 10 minutes until the synchronization is completed. Then restore board active/standby status.

A network on which ASON is to be enabled has been configured with transparent transmission of DCC bytes for third-party equipment. Which of the following is true?

A. Do not enable ASON for the network, regardless of whether inband or outband DCN is used.

B. You can enable ASON for the network, regardless of whether inband or outband DCN is used.

C. You can enable ASON for the network when inband DCN is used.

D. You can enable ASON for the network when outband DCN is used.