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

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Computer Networking
Demodulation is the process of

combining many low speed channels into one high speed channel
converting digital signals to analog signals
converting analog signals to digital signals
None of these
dividing the high-speed signals into frequency bands

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