Computer Networking
Bulletin board system

is a modem capable of accepting commands
converts digital signals to analog signals
is a public access message system
None of these
converts analog signals to digital signals

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Computer Networking
The Internet Control Message Protocol (ICMP)

provides communication between the Internet Protocol Software on one machine and the Internet Protocol Software on another
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

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