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Huawei H12-931-ENU Exam Syllabus Topics:

Huawei Certified Internetwork Expert-Transmission Sample Questions:

1. In NG-SDH equipment, which of the following conditions will not cause TPS switching to occur?

A) 58M crystal oscillator abnormal
B) 3.3V power supply undervoltage
C) Chip abnormality (SD538, SA527, CPLD)
D) Report T_LOSEX on the working branch board

2. It is found that the U2000 dual machine of the customer network is in the dual master state. In the measures and descriptions of the problem, the correct one is () (multiple choice)

A) Run the command #vradmin -g datadg repstatus datarvg, and find that the data status is "consistent, up-to-date", which means that the primary and secondary data are not synchronized and need to be updated
B) Check whether the heartbeat line between the main and standby machines is working properly
C) You can first check whether there is any abnormality in the operating status of the main and standby machines
D) If it is a DCN problem, you can use the command #vradmin -g datadg repstatus datarvg at the main site to check the status of the high-availability system after the repair

3. OSN6800 reports the commun_fail alarm from the SCC board of subrack 2, the third digit of the parameter is 0X04, the network element is not disconnected, and the master subrack and slave subrack 1 have no abnormal alarms. The possible cause of the failure is (multiple choice)

A) Slave 3 AUX board failure
B) Slave 2 AUX board failure
C) The network cable between subrack 2 and 3 is faulty
D) The AUX board of the main subrack is faulty

4. Which of the following descriptions are correct for error alarms (multiple choice)

A) OTUk_SES and ODUk_PM_SES are OTUk/ODUk severely errored seconds, and the count is not zero, indicating that the OTUk/ODUk signal has generated a large bit error in seconds (1 second counting error bits more than 15% of the maximum transmission byte)
B) OTUk_ES (OTUk_BEE ), ODUk_PM_ES (ODUk PM_BBE) are OTUk/ODUk errored seconds (background error block), the count is the error count of the OTUk/ODUk signal that is counted, non-zero means OTUk/ODUk signal The second in which a bit error occurred (the number of errored blocks).
C) FEC_AFT_COR_ER enables the FEC function to be valid. The error rate after FEC error correction indicates the error statistics of the OTUk signal (including OTUk overhead) after FEC encoding and error correction. The error after correction is not zero, which means transmission The bit error introduced by the layer may have affected the OTUk signal.
D) FEC_BEF_COR_ER enables the FEC function to be effective, FEC error rate before error correction, indicating the error statistics of the received OTUk signal (including OTUk overhead), and the error rate before error is not zero, indicating the error rate introduced by the transport layer The bit error may have affected the OTUk signal.

5. The following clock networking optimizations are wrong:

A) Under the standard SSM switching protocol, the clock can be configured as bidirectional, but it must not be configured as a ring. Enable the extended SSM protocol to solve the clock loop problem by assigning a clock ID to the clock source.
B) Under the non-SSM switching protocol, the clock network can only be configured as one-way and cannot form a loop.
C) For PDH, ITU-T stipulates that 4 consecutive odd frames sa4~sa8 in 2M bit signal TS0 are used to transmit quality information, and SDH uses S1 byte b5-b8 to transmit the same quality information. SDH equipment can automatically extract SSM information from the 2Mhz external clock signal provided by the BITS equipment, so as to know the quality level of the timing signal.
D) Timing reference clock transmission link, requires that at most N=20 network elements, the transit office clock must be introduced for clock reshaping and regeneration (high-quality clocks are serialized), up to K=10 transit office clocks, clocks The maximum number of G.813 clocks on the link does not exceed 60.

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