The PRBS can be used to test whether an SDH service is normal and whether the protection switching function is normal.
A. TRUE
B. FALSE
正解:A
質問 2:
Assume that 2 x VC-12 timeslots need to be bound with VCTRUNK1 of the N2EFS4 board. When 8 x VC-4 timeslots are available on the N2EFS4 board, which of the following timeslots meets the requirements?
A. VC-4 VC-12 timeslots 1 and 2 of the fourth
B. VC-4 VC-12 timeslots 1 and 2 of the eighth VC-4
C. VC-12 timeslots 1 and 2 of the first VC-4
D. VC-12 timeslots 33 and 34 of the second
正解:A
質問 3:
Which of the following are the steps for multiplexing low-speed services into high-speed SDH services?
(Multiple Choice)
A. Overhead insertion
B. Mapping
C. Alignment
D. Multiplexing
正解:B,C,D
質問 4:
WDM multiplexes the optical signals at multiple rates (wavelengths) over one fiber for transmission. The digital signals carried by these optical signals must have the same rate and data format.
A. TRUE
B. FALSE
正解:B
質問 5:
The OSN 1500/2500/3500/7500 supports both DC and AC power inputs.
A. TRUE
B. FALSE
正解:B
質問 6:
In the 2.5G MSP ring consisting of four MSTP sites, when a protection switching occurs, which of the following statements about the alarm reporting is correct?
A. The APS-INDI alarm is reported on the line board.
B. The APS-INDI alarm is reported on the system control board.
C. The PS alarm is reported on the tributary board.
D. The APS-INDI alarm is reported on the XCS board.
正解:D
質問 7:
Which of the following bridges is used to forward data based on the MAC address and VLAN ID carried in data?
A. 802.1d
B. 802.11ab
C. 802.1q
D. 802.1a
正解:C
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