At which layer of the OSI model would you assume the problem is if you type show interface serial 1 and receive the following message?_x005F_x000D_ Serial 1 is down, line protocol is down

At which layer of the OSI model would you assume the problem is if you

1.	At which layer of the OSI model would you assume the problem is if you type show interface serial 1 and receive the following message?_x005F_x000D_ Serial 1 is down, line protocol is down
A.	Physical layer
B.	Data Link layer
C.	Network layer
D.	None
Answer» B. Data Link layer

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At which layer of the OSI model would you assume the problem is if you type show interface serial 1 and receive the following message?_x005F_x000D_ Serial 1 is down, line protocol is down

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