Computer Networking
Baseband is

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

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Computer Networking
The physical layer, in reference to the OSI model, defines

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

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