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

None of these
the interface between the X.25 network and packet mode device
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

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Computer Networking
A front-end processor is

a minicomputer that relieves main-frame computers at a computer centre of communications control functions
preliminary processor of batch jobs.
a processor in a large-scale computer that executes operating system instructions
a user computer system
None of these

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