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
The application layer of a network

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

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Computer Networking
TCP is:

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

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