Computer Networking
The Internet Control Message Protocol (ICMP)

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

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Computer Networking
Modulation is the process of

converting analog signals to digital signals
performing data encryption.
converting digital signals to analog signals
Multiplexing various signals into high speed line signals

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