Which of the following description of the principle of automatic protection switching of the standard SSM protocol are correct? (Multiple choice)

• A.The network element broadcasts the clock quality information and the clock source ID of the synchronization source through the downstream station between the S1 bytes, and notifies the upstream station that the clock quality from the local network element is "not available for synchronization" by the S1 byte in the direction of the synchronization source.
• B.According to the clock source priority table, the network element first selects the clock with the highest quality level from the available clock sources as the homologous source.
• C.If there are multiple clock sources with the highest quality level, the network element selects the clock with the highest clock priority as the synchronization source.
• D.The network element broadcasts the clock quality information of the synchronization source to the downstream site through the S1 byte, and notifies the upstream station that the clock quality from the local network element is "not available for synchronization" by the S1 byte in the direction of the synchronization source.

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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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The OTS path refers to the physical fiber connection between two adjacent OM/OD/OA on the main optical path.

• A.TRUE
• B.FALSE

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Which of the following is the incorrect description of the internal port properties of the Ethernet board?

• A.For the ingress port of the Tag Aware attribute, if the input data does not carry the VLAN ID, discard.
• B.For the ingress port of the Access attribute, if the input data does not carry the VLAN ID, it is directly transparent.
• C.For the ingress port for the Access attribute, if the input data carries the VLAN ID, discard.
• D.For the inbound port of the Tag Aware attribute, if the input data carries the VLAN ID, transparently receive the data.

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The transmission plane mainly performs functions such as optical signal transmission, configuration protection switching, and reconnection, and ensures the reliability of the transmitted optical signal. However, the switching action of the transport layer is performed under the influence of the management dry surface and the control plane.

• A.FALSE
• B.TRUE

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