Computer Networking
HDLC (High-level Data Link Control) is

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

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Computer Networking
An encyclopedic database

All of these
is generally free
None of these
is easy for beginners to use
is an information utility that specializes in storing and searching information

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