Computer Networking
A WATS arrangement

is less expensive than flat-rate service only when the number of calls is large and the duration of each is short
is always less expensive than flat-rate service
None of these
is less expensive than flat-rate service only when the number of calls is small and the duration of each is long
is never less expensive than flat-rate service

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

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
the interface between the X.25 network and packet mode device
All of these
None 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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Computer Networking
TCP is:

None of these
Connection orientated and reliable
Connection orientated and unreliable
Connectionless and unreliable
Operates at the Data Link layer

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