Computer Networking
The application layer of a network

defines the user's port into the network
consists of software being run on the computer connected to the network
All of these
establishes, maintains, and terminates virtual circuits
None of these

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

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

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