Computer Networking
TCP is:

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

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Computer Networking
The Internet Control Message Protocol (ICMP)

All of these
allows gateways to send error a control messages to other gateways or hosts
None 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
provides communication between the Internet Protocol Software on one machine and the Internet Protocol Software on another

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