Computer Networking
X.21 is

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

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Computer Networking
UDP is:

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

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