Computer Networking
The application layer of a network

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

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Computer Networking
The Internet Control Message Protocol (ICMP)

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
All of these
allows gateways to send error a control messages to other gateways or hosts

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