Computer Networking
The channel in the data communication model can be

None of these
telephone lines
postal mail service
radio signals
All of these

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

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

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