Computer Networking
Baseband is

All of these
transmission of signals without modulation
None 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

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

All of these
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
the virtual circuit interface to packet-switched service

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Computer Networking
MAC is

network access standard for connecting stations to a circuit-switched network
a method access control technique or multiple-access transmission media
a method of determining which device has access to the transmission medium at any time
a very common bit-oriented data link protocol issued to ISO.
None of these

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