Computer Networking
The network layer, in reference to the OSI model, provide

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

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Computer Networking
Synchronous protocols

transmit characters one at a time
are more reliable
None of these
are generally used by personal computers
allow faster transmission than asynchronous protocols do

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