Computer Networking
A T-switch is used to

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

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Computer Networking
X.21 is

None of these
a method access control technique for multiple-access transmission media
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
network access standard for connecting stations to a circuit-switched network

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