Computer Networking
The Internet Control Message Protocol (ICMP)

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
allows gateways to send error a control messages to other gateways or hosts
All of these
None of these

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Computer Networking
The application layer of a network

establishes, maintains, and terminates virtual circuits
consists of software being run on the computer connected to the network
None of these
All of these
defines the user's port into the network

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