What are two possible causes if an Ethernet interface is up and the line protocol is down? (Choose two)
A . The Ethernet cable might not be attached properly
B . There is a speed or duplex mismatch with the remote device
C . The Ethernet interface has been manually disabled
D . There is a Layer 2 mismatch in the encapsulation type
E . Keepalives are not being received by the local device
Answer: B, D