Refer to the exhibit.
What is the reason that the interface status is “administratively down, line protocol down”?
A.
There is no encapsulation type configured.
B.
There is a mismatch in encapsulation types.
C.
The interface is not receiving any keepalives.
D.
The interface has been configured with the shutdown command.
E.
The interface needs to be configured as a DTE device.
F.
The wrong type of cable is connected to the interface.
Explanation:
Interface can be enabled or disabled with shutdown/no shutdown command. If you interface is
down, it will display administratively down status. You can bring up an interface having
administratively down interface using no shutdown command.
3 possible state
1. serial0/0 up, line protocol is up The interface is up and the link protocol is up.
2. serial0/0 down, line protocol is down The interface is down and there is something wrong with the physical layer .
3. serial0/0 up, line protocol is down The interface is up , but the encapsulation format is not matched correctly.
If you interface isdown, it will display administratively down status. You can bring up an interface having administratively down interface using no shutdown command.
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Basically if
serial0/0 down mean possble wrong cable, F will be correct asnwer
serial0/0 administratively down mean the interface is shutdown
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remember it is Layer 1 and Layer 2 status. So more accurately the options are…
1- up/up = cable connection good and layer 2 communicating (i.e. ethernet using mac, serial with PPP, HDLC, frame-relay, etc operational)
2 – up/down = cable connection good and layer 2 having problem (i.e. IETF encapsulation on one router and Cisco on the other side of a frame-relay
3 – down/down = Layer 1 is down and therefore no way layer 2 could operation. Cable is bad, not connected, remote device is powered off, etc
4 – admin down/down = administrator disabled the port by configuration, status of Layer 1 and Layer 2 is unknown but of no consequence until it is enabled again
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