Computer Networking
Which of the following communications modes support two-way traffic but in only one direction of a time?

half-duplex
three-quarters duplex
full-of the above
None of these
simplex

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

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

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