Computer Networking
The data-link layer, in reference to the OSI model, specifies

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
None of these

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Computer Networking
Terminals are required for

realtime, distributed processing, and manager inquiry
None of these
realtime, timesharing, and distributed processing
realtime, batch processing, and timesharing
realtime, timesharing, and message switching

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