Computer Networking
Which of the following communications lines is best suited to interactive processing applications?

narrowband channels
mixed band channels
full-duplex lines
None of these
simplex lines

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

All of these
None of these
the interface between the X.25 network and packet mode device
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

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Computer Networking
MAC is

None of these
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.
network access standard for connecting stations to a circuit-switched network

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