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

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

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Computer Networking
Satellite-Switched Time-Division Multiple Access (SS/TDMA) is

None of these
the method of determining which device has access to the transmission medium at any time.
All of these
a form of TDMA in which circuit switching is used to dynamically change the channel assignments
a medium access control technique for multiple access transmission media

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