How Internet Control Message Protocol (ICMP) Works?
Internet Control Message Protocol (ICMP) works as companion protocol of IP which used to convey the errors and information to original host.
ICMP messages are of two types first is error-reporting messages and second is query messages. The error-reporting messages report problems that a router or a host may encounter when it processes an IP packet. The query messages help a host or a network manager get specific information from a router or another host.
Error reporting messages are further classified as destination unreachable, source quench, time exceeded, parameter problems, and redirection and important query messages are like echo request and replay and timestamp request and replay. This video explains all messages in detail with examples.
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