Computer Networking
Baseband is

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

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

the interface between the X.25 network and packet mode device
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

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