H31-321_V1.0-ENU 試験問題と解答 - 模擬練習 - 練習問題・模擬試験

Question No : 1
Which of the following functions, when enabled, allows the transmitting laser of an optical port to be automatically shut down when the IN port fails to receive signals?

A.LCAS
B.ALS
C.ALC
D.LFT

正解:

Question No : 2
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

正解:

Question No : 3
Which of the following are true about an SDH network?

A.The NMS communicates with a gateway NE using the OSPF protocol.
B.NEs communicate with each other over ECCs.
C.ECC communication is implemented by the D byte.
D.The maximum DCC rate is 192 Kbit/s.
E.By default, Huawei OptiX equipment uses D1 to D3 bytes for DCC communication. After ASON is enabled, the D4 to D12 bytes can function as in band control channels to transmit control information for the control plane.

正解:

Question No : 4
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: 1#VC~4-11#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: 1#VC~4-4#VC~4; Protection path 1: 5#VC~4-8#VC~4

正解:

Question No : 5
What path levels are available in an NG-SDH system?

A.VC~11
B.VC~12
C.VC~3
D.VC~4
E.VC~4-XC (X = 4, 8, 16, 64)

正解:

Question No : 6
Alarm signals on the PDH ports working at different rates differ.
Which of the following are true?

A.The T_ALOS alarm is reported when external signals are lost on an El electrical interface board.
B.The P_LOS alarm is reported when external signals are lost on an E3 or E4 electrical interface board.
C.The DOWN_E1_AIS is reported when an El electrical interface board detects all “1”s in the downstream signal stream.
D.The UP_E1_AIS is reported when an El electrical interface board detects all “1”s in the upstream
E.signal stream.
F.The P_AIS is reported when an E3 electrical interface board detects all “1”s in signal streams.

正解:

Question No : 7
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 “1”s, the local NE reports the TU-AIS alarm.

正解:

Question No : 8
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

正解:

Question No : 9
What is the maximum number of NEs traversed by a data forwarding path in Huawei ECC communication?

A.16
B.32
C.63
D.128

正解:

Question No : 10
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

正解:

Question No : 11
Which of the following are true about laser safety operations?

A.When installing or maintaining an optical interface board or optical fibers, do not look into the optical interface board or fiber connectors.
B.You need to disconnect the fiber jumper from the optical interface board of the peer NE when using an optical time domain reflectometer (OTDR).
C.Use protective caps to cover unused optical ports and optical connectors of fiber jumpers.
D.You can replace optical interface boards or optical modules during equipment-side maintenance.

正解:

Question No : 12
When you reseat an SDH or PDH service board on NG-SDH equipment, certain alarms are reported. The alarms are automatically cleared after the board is online.
Which are the typical alarms?

A.BUS_ERR
B.BD_NOT_INSTALLED
C.bd_status
D.COMM UN FAIL

正解:

Question No : 13
Which of the following statements is false about pre-commissioning check?

A.Verify that the equipment is properly grounded.
B.An AUX board provides multiple RJ45 ports that receive same signals. Wrong port connections do not affect the equipment or boards.
C.On an AUX board, LAM PI is the cabinet alarm indicator output port and LAMP2 is the cabinet alarm indicator cascading input port. Verify that the ports are connected correctly, to prevent short circuits.
D.Verify that the NMS is successfully installed.

正解:

Question No : 14
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.

正解:

Question No : 15
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.

正解:

Huawei H31-321_V1.0-ENU 問題練習