Internet Control Message Protocol (ICMP)

Internet Control Message Protocol (ICMP) is a special type of packet used for inter-device communication, carrying everything from redirect instructions to timestamps for synchronization between devices. ICMP is an error-reporting protocol for network devices such as routers, used to generate error messages to the source IP address when network problems prevent delivery of IP packets. While ICMP is not used regularly in end-user applications, it is used by network administrators to troubleshoot Internet connections in diagnostic utilities.

Related Terms: Transmission Control Protocol (TCP), User Datagram Protocol (UDP)

Sources: TechTarget, PingPlotter

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