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

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
the virtual circuit interface to packet-switched service
None of these
All of these

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Computer Networking
Modulation is the process of

Multiplexing various signals into high speed line signals
performing data encryption.
converting analog signals to digital signals
converting digital signals to analog signals

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