What layer of the OSI model would you assume the problem is in if you – McqOptions

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1.	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."
A.	Physical layer
B.	Data Link layer
C.	Network layer
D.	None. It is a router problem.
Answer» B. Data Link layer

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