Computer Networking
A T-switch is used to

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

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Computer Networking
The Internet Control Message Protocol (ICMP)

All of these
reports error conditions to the original source, the source must relate errors to individual application programs and take action to correct the problem
None of these
allows gateways to send error a control messages to other gateways or hosts
provides communication between the Internet Protocol Software on one machine and the Internet Protocol Software on another

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