How ICMP is used in ping and traceroute facilities

Answer Posted / hasan

ICMP works on
echo-request n echo-reply

in network communications devices echo-request/reply's open
open in network security devices echo-request/reply is
close as inbound traffic is restricted by default.

so by this process of echo-request n echo-reply the PING
and traceroute works and gives the information that the
channel is established.

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