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Huawei HCIA-Transmission V2.5 Sample Questions:

1. Which of the following descriptions of LCAS is wrong?

A) If the belt curtain of a VCTrunk is not suitable and needs to be increased or decreased, the belt curtain can be adjusted through LCAS, which only requires increasing or decreasing the number of VCTrunk members to achieve smooth belt curtain upgrade without interrupting business
B) Use SDH overhead bytes (high-order virtual concatenation uses K4, low-order virtual concatenation uses H4) to carry control information and perform handshake operations between the source and the sink
C) TR_TIMR is the waiting time for recovery, which refers to the time it takes for the time slot shielded by LCAS to be added to the LCAS virtual cascade group after it changes from bad to good.
D) When some members fail, other members still transmit data normally; when the failed members are repaired, the bandwidth of the virtual cascade group can be automatically restored.

2. In the SDH multiplexing structure, the rate represented by VC-12 is ().

3. Which of the following descriptions of the electrical layer multiplexing phase mapping steps of ODU0 is wrong?

A) After mapping and multiplexing, 8 ODU0 signals can be multiplexed into 1 0TU2V VI signal.
B) After mapping and multiplexing, two DDU0 signals can be multiplexed into one OTU1[V] signal.
C) 80 0DU0 signals are mapped and multiplexed, and finally multiplexed into 1 OTU4 signal
D) After mapping and multiplexing, 34 0DU0 signals can be multiplexed into 1 OTU3[VM signal

4. In Recommendation ITU-TG692, the allowed signal frequencies are based on the reference frequency () and the channel spacing can be 100 GHz, 50 GHz or 25 GHz.

A) 194.1 THz
B) 192.1 terahertz
C) 1931 Terahertz
D) 196.1 terahertz

5. Which of the following options belong to optical layer boards? (Multiple choice)

A) Optical monitoring channel board
B) Business processing board
C) Optical Add/Drop Multiplexing Board
D) Spectral analysis board

Solutions: