Computer Networking
TCP is:

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

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Computer Networking
A T-switch is used to

echo every character that is received
control how messages are passed between computers
transmit characters one at a time
None of these
rearrange the connections between computing equipment

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Computer Networking
X.21 is

a method of determining which device has access to the transmission medium at any time
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 access control technique for multiple-access transmission media

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