Computer Networking
The channel in the data communication model can be

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

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

All of these
the virtual circuit interface to packet-switched service
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
None of these

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