If you enter show interfaces serial 0/0 and receive the message “Serial0/0 is up, line protocol is
down,” what are three possible causes? (Choose three.)
A.
No cable is attached to the interface.
B.
The clock rate is not set.
C.
No keepalive messages are received.
D.
The interface is shut down.
E.
No loopback address is set.
F.
There is a mismatch in the encapsulation type.
Explanation: