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:A
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.