Computer Networking
The data-link layer, in reference to the OSI model, specifies

None of these
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

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Computer Networking
Bandlimited signal is

a signal all of whose energy is contained within a finite frequency range
simultaneous transmission of data to a number of stations
None of these
All of these
transmission of signals without modulation

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