What layer of the OSI model would you assume the problem is in if you type show

Question

What layer of the OSI model would you assume the problem is in if you type show interface serial 1 and receive the following message? "Serial1 is down, line protocol is down."

Options:

A . Physical layer

B . Data Link layer

C . Network layer

D . None. It is a router problem.

Answer: Option A

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