Computer Networking
ICMP (Internet Control Message Protocol) is

a TCP/IP protocol used to dynamically bind a high level IP Address to a low-level physical hardware address
a TCP/IP high level protocol for transferring files from one machine to another
a protocol used to monitor computers
a protocol that handles error and control messages
None of these

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Computer Networking
The packets switching concept was first proposed

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

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