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H31-321 Huawei Certified Network Professional-MSTP Transmission

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Huawei · H31-321

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Question 1

Multiple choice

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.

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Correct answersA, B, C, D

Question 2

Single choice

Which of the following is true about pointer justification?

A
The justification step of AU and TU pointers is 1 byte.
B
If the local NE detects an TU pointer justification event in the lower order path, pointer justification has occurred on the local NE.
C
When an NE receives eight consecutive NDFs, the NE reports the AU_LOP alarm, indicating loss of the AU pointer.
D
When the rate (frame frequency) of VC-4 is higher than that of the AU-4, a positive pointer justification will occur.

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Correct answerC

Question 3

Single choice

Which file needs to be modified on the U2000 to change the VC-12 timeslot numbering policy?

A
trans_ems.cfg
B
locale, properties
C
ems.cfg
D
imap.cfg

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Correct answerA

Question 4

Single choice

Which of the following indicates a negative AU pointer justification?

A
Three bytes after H3
B
Three H3 bytes of AU-FTR
C
Three bytes before H3
D
None of the above

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Correct answerB

Question 5

Multiple choice

Which of the following are true about the relationship between pointer justification and bit errors?

A
Justification of a large number of pointers may cause bit errors,
B
A large number of bit errors may cause pointer justification.
C
Bit errors do not lead to pointer justification.
D
Pointer justification does not lead to bit errors.

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Correct answersA, C

Question 6

Single choice

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

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Correct answerA

Question 7

Multiple choice

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.

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Correct answersA, B, C, E

Question 8

Multiple choice

What are the common causes for an SNCP switching failure?

A
Hardware faults
B
Incorrect fiber connections between boards
C
Incorrect setting of protection group parameters
D
Incorrect setting of hold-off time

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Correct answersA, B, C

Question 9

Single choice

The ID of an OptiX OSN 3500 NE is composed of a basic ID and an extended ID. The basic ID and extended ID are set using DIP switches during equipment commissioning.

A
TRUE
B
FALSE

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Correct answerB

Question 10

Multiple choice

Which of the following about the conditions that trigger rerouting on NG-SDH equipment?

A
R_LOS, R_LOF
B
RSBBE, MSBBE
C
MS_AIS, MS_RDI
D
AU_AIS, AU_LOP
E
HP_UNEQ, HP_LOM

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Correct answersA, C, D

Question 11

Multiple choice

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.

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Correct answersA, B, C

Question 12

Multiple choice

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.

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Correct answersA, B, C

Question 13

Single choice

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

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Correct answerA

Question 14

Multiple choice

The physical cross-connect board of an OSN 3500 is N1SXCSA.

Which of the following can be configured as the logical board for N1SXCSA?

A
N1SXCSA
B
N1EXCSA
C
N1UXCSA
D
N2SXCSA
E
N2EXCSA

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Correct answersA, B, C

Question 15

Multiple choice

Network-level protection switching must be tested during system commissioning for OptiX OSN 3500.

Which of the following will trigger protection switching on a ring network?

A
Perform a loopback (LB) test.
B
Shut down the laser.
C
Disconnect fibers.
D
Power off the equipment.

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Correct answersB, C, D

Question 16

Multiple choice

You need to collect and save field data in a timely manner during troubleshooting.

What does the data include?

A
Cabinet alarm indicator status
B
Running status of NEs and boards
C
Configuration data of NEs and boards
D
Equipment alarms and performance events
E
NMS operation logs

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Correct answersB, C, D, E

Question 17

Single choice

Generally, a central NE where ECC communication load is heavy and congestion is the most likely to occur is set as the gateway NE.

A
TRUE
B
FALSE

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Correct answerA

Question 18

Single choice

PQ1 must work with an interface board.

Which of the following is a 75-ohm interface board?

A
D75S
B
D12S
C
D12B
D
D34S

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Correct answerA

Question 19

Single choice

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

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Correct answerB

Question 20

Multiple choice

You need to specify the length of data frames before using a data analyzer to test throughput.

What is the length of a standard Ethernet frame?

A
64 bytes
B
128 bytes
C
1518 bytes
D
1544 bytes

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Correct answersA, B, C

Question 21

Multiple choice

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.

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Correct answersA, B, C

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Huawei Certified Network Professional-MSTP Transmission

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