An interface status message states that the interface line status is down and its protocol status is down (err-disabled). Which of the following could be the cause of this status?
A) Nothing; the interface is working fine.
B) Port security has disabled the interface.
C) No cable, bad cable, wrong cable pinouts, or the speeds are mismatched on the two connected devices.
D) The interface is configured with the shutdown command.
B
Explanation: B) The correct answer is that port security has disabled the interface, because this is the code you will receive when port security has been set on and the interface received a piece of offending traffic, which caused it to shut down.
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