Computer Networking
The Internet Control Message Protocol (ICMP)

allows gateways to send error a control messages to other gateways or hosts
All of these
provides communication between the Internet Protocol Software on one machine and the Internet Protocol Software on another
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

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Computer Networking
UDP is:

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

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