H31-321 Online Practice Questions and Answers

NG-SDH equipment supports MS-shared protection. Which of the following are false about timeslot mapping between the working path and protection path?

A. Working path 2: 17#VC-4~20#VC-4; Protection path 2: 49#VC-4~52#VC-4

B. Working path 1: l#VC-4~ll#VC-4; Protection path 1: 33#VC-4~43#VC-4

C. Working path 2: 4#VC-4~7#VC-4; Protection path 2: 9#VC-4~12#VC-4

D. Working path 1: l#VC-4~4#VC-4; Protection path 1: 5#VC-4~8#VC-4

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.

A 2M BER tester can be used for BER testing on electrical ports. To which of the following boards can a 2M BER tester be connected for BER testing on electrical ports?

A. D75S

B. D12S

C. SEP1

D. D34S

All NEs of a subnet are unreachable to the U2000, but the communication between the other subnets and the U2000 is normal. What are the possible causes of this phenomenon?

A. Incorrect fiber connections or fiber faults

B. Failure in the U2000

C. The IP address of the gateway NE is changed by mistake.

D. The SCC board of the NE that is at the border of the affected subnet is faulty.

E. The network size is too large, and ECC communication is beyond the processing capability of the network.

To objectively evaluate the performance of a network packet switching device, define test methods, and test report formats, you need to perform RFC 2544 performance tests. What does an RFC 2544 test cover?

A. Throughput

B. Packet loss rate

C. Latency

D. Back-to-back

E. Maximum frame rate (line rate)

Generally, what is the maximum number of NEs on an ECC subnet, to ensure communication performance of an ECC subnet?

A. 64

B. 96

C. 128

D. 256

An N2SLQ16 board that is configured with AU3 services is faulty. If no spare N2SLQ16 board is available, the N1SLQ16 board can function as a substitute.

A. TRUE

B. FALSE

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

What do typical methods of testing Ethernet performance on NG-SDH equipment include?

A. Equipment performance test

B. Network performance test

C. System acceptance test

D. User-defined test

NG-SDH equipment supports -48 V and -60 V power inputs. For OSN 3500, you can set the monitoring range of power input voltage by setting the power jumpers of N3GSCC. For -48V power input, you need to remove the caps of jumpers J30 and J31.

A. TRUE

B. FALSE