Computer Networking
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."

Network layer
Physical layer
Data Link layer
None. It is a router problem.

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Computer Networking
What is the problem with an interface if you type show interface serial 0 and receive the following message? "Serial0 is administratively down, line protocol is down."

The administrator has the interface shut down.
The keepalives are different times.
The administrator is pinging from the interface.
No cable is attached.

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Computer Networking
Satellite-Switched Time-Division Multiple Access (SS/TDMA) is

a form of TDMA in which circuit switching is used to dynamically change the channel assignments
All of these
None of these
a medium access control technique for multiple access transmission media
the method of determining which device has access to the transmission medium at any time.

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