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

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

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Computer Networking
UDP is:

Not a part of the TCP/IP suite
Connection orientated and reliable
None of these
Connection oriented and unreliable
Connectionless and unreliable

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