Day: March 19, 2019

CCNP R&S 005: Describe IP Operations

Internet Control Message Protocol Internet Control Message Protocol (ICMP) is part of the IP protocol suit. ICMP is used primarily for network management. Like TCP and UDP, ICMP is a protocol of it’s own. Unlike TCP and UDP, ICMP isn’t for sending data for applications to use. You’ve probably heard of ping right? Ping is Control Message type 0. The two Control Messages we’ll look at today are ICMP Unreachable and ICMP Redirect. These are Control Message Types 3 and 5 respectively.

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