Can't log in after NE is created, what are the possible reasons?

The NE user password is incorrect
The NE user has logged in
The communication between the network management and the network element is abnormal
The time on the network element side and the network management side is different

Answer(s): A,B,C

How many bits does the VLAN ID occupy in the Ethernet frame format marked with IEEE 802.1Q?

Answer(s): C

When the optical cable between the FIU and the FIU is faulty, what are the optical layer alarms reported by the downstream station?

Answer(s): A,B,C

When the scheduling granularity of the N302 board is ODUflex, what are the supported protection types?

Answer(s): A,C

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