Which of the following monitoring boards do not support the processing and transparent transmission of 1588V2 signals? (Multiple choice)

• A.ST2
• B.SC1
• C.AST2
• D.SC2

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Which of the following description of 1+1 optical line protection is wrong?

• A.The primary and secondary input lights initial difference defaults to 0.
• B.The switching method defaults to non-recovery
• C.The active and standby input light difference defaults to 5dB.
• D.The switching mode defaults to double-ended switching

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When the board detects that the error rate of the regenerator section signal exceeds 10 by detecting the B1 byte, the B1_SD alarm is reported.

• A.TRUE
• B.FALSE

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MPLS-TP is a subset of MIPLS that removes connectionless IP-based forwarding and adds end-to-end OA functionality.

• A.FALSE
• B.TRUE

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Which of the following statements about MPLS is wrong?

• A.In the packet transport field, the MPLS technology is mainly used to construct tunnels to carry various types of services (for example, TDM, ATM, and Ethernet) transmitted by PWE3 to implement end-to-end transmission of services on packet networks.
• B.MPLS has two planes: control plane and forwarding plane. The control plane is connection-oriented, the forwarding plane is connectionless.
• C.MPLS is not a service or application. It is a standard routing and switching platform that supports various upper-layer protocols and services.
• D.MPLS packet forwarding is based on labels.

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