Computer Networking
The Internet Control Message Protocol (ICMP)

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

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Computer Networking
The packets switching concept was first proposed

in the late 1980s for the Defense Ministry of US.
None of these
in the late 1950s for Defense Ministry of US
All of these
in the early 1960s for military communication systems, mainly to handle speech

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