Computer Networking
Which of the following might be used by a company to satisfy its growing communications needs?

All of these
concentrator
front-end processor
controller
multiplexer

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

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

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