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

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
None of these

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Computer Networking
An encyclopedic database

is an information utility that specializes in storing and searching information
is generally free
None of these
is easy for beginners to use
All of these

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