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?

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.
You need to be in privileged mode.

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Computer Networking
The data-link layer, in reference to the OSI model, specifies

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

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