Computer Networking
The network layer, in reference to the OSI model, provide

the virtual circuit interface to packet-switched service
the interface between the X.25 network and packet mode device
None of these
data link procedures that provide for the exchange of data via frames that can be sent and received
All of these

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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."

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

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