Computer Networking
A smart modem can dial, hang up and answer incoming calls automatically. Can you tell who provides the appropriate instruction to the modem for this purpose?

Link access procedure (LAP)
Communications software
None of these
Telecommunications
Error detecting protocols

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

data link procedures that provide for the exchange of data via frames that can be sent and received
All of these
the virtual circuit interface to packet-switched service
the interface between the X.25 network and packet mode device
None of these

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