OSN6800 reports the commun_fail alarm from the SCC board of subrack 2, the third digit of the parameter is 0X04, the network element is not disconnected, and the master subrack and slave subrack 1 have no abnormal alarms. The possible cause of the failure is (multiple choice)

• A.Slave 3 AUX board failure
• B.The network cable between subrack 2 and 3 is faulty
• C.Slave 2 AUX board failure
• D.The AUX board of the main subrack is faulty

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172.17.15.0/28 When dividing subnets, which of the following addresses are legal subnet addresses (multiple choice)

• A.172.17.15.0
• B.172.17.15.96
• C.172.17.15.40
• D.172.17.15.8

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Which of the following descriptions are correct in daily maintenance?

• A.During the cutover process, it is found that other unrelated network elements report an alarm, but the customer does not know that it will be processed directly
• B.Unplug and plug the board with the customer's consent
• C.Without the authorization of the customer, the network management performs configuration data operations
• D.For the convenience of collecting data, if you don't know the customer, you can directly create a network element user to collect data

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PW APS bundling can reduce APS resource consumption and increase the speed of batch service switching.
Which of the following descriptions about PW APS bundling are correct? (multiple choice)

• A.When the PW APS protection group is switched, its subsidiary protection pair also undergoes the same switching.
• B.When the status of the PW APS slave protection pair changes, it will cause the status of the PW APS protection group to change.
• C.When the PW APS protection group is switched, its subsidiary protection pairs will not undergo the same switching.
• D.When the status of the PW APS slave protection pair changes, it will not cause the status of the PW APS protection group to change.

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The following description of OLP optical line protection is wrong:

• A.Protection principle: dual-transmit and selective-receive, single-ended switching, non-recovery by default;
• B.APS protocol; no need for the whole network protocol;
• C.When configuring protection, the transceiver of the first port (TO1/RI1) can be configured to work or protection;
• D.Switching conditions: MUT_LOS/POWER-DIFF-OVER;

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