MPLS tunnel APS protection supports multiple types of command switching and has different priorities.
Which of the following command switching types has the highest priority?

• A.Force Switching
• B.Manual Switching
• C.Practice Switching
• D.Locked Switching

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

• A.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 synchronization source.
• B.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.
• C.The network element broadcasts the clock quality information of the synchronization source to the downlink site through the s1 byte. And reverse notice the uplink site by the S1 byte in the direction of the synchronization source that the clock quality from the local network element is "not available for synchronization".
• D.The network element broadcasts the clock quality information and the clock source ID of the synchronization source to the downlink site through the S1 byte, and reverse notices the uplink site 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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Which of the following description of 1+1 optical line protection is wrong?

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

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Since the EALC/ALC function is used in the SOM system, there is a possibility of business interruption during optical power adjustment.

• A.TRUE
• B.FALSE

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For emergency handling of business interruptions, fault location should be performed as soon as possible, and then the business should be resumed.

• A.FALSE
• B.TRUE

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