Computer Networking
You type the following command into the router and receive the following output:Router#show serial 0/0 ^% Invalid input detected at '^' marker.Why was this error message displayed?

You need to be in privileged mode.
Part of the command is missing.
The router does not have a serial0/0 interface.
You cannot have a space between serial and 0/0.

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Computer Networking
The physical layer, in reference to the OSI model, defines

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

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