Computer Networking
The Internet Control Message Protocol (ICMP)

None of these
provides communication between the Internet Protocol Software on one machine and the Internet Protocol Software on another
allows gateways to send error a control messages to other gateways or hosts
reports error conditions to the original source, the source must relate errors to individual application programs and take action to correct the problem
All of these

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Computer Networking
A front-end processor is

None of these
a minicomputer that relieves main-frame computers at a computer centre of communications control functions
a processor in a large-scale computer that executes operating system instructions
preliminary processor of batch jobs.
a user computer system

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