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
data link procedures that provide for the exchange of data via frames that can be sent and received
All of these
None of these

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Computer Networking
The application layer of a network

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

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