# Section 02: Host Discovery

## Address Resolution Protocol (ARP)

The Address Resolution Protocol (ARP) is a communication protocol used for discovering the link layer address, such as a MAC address, associated with a given internet layer address, typically an IPv4 address. This mapping is a critical function in the Internet protocol suite. ARP was defined in 1982 by RFC 826, which is Internet Standard STD 37.

Links

* [https://en.wikipedia.org/wiki/Address\_Resolution\_Protocol](https://en.wikipedia.org/wiki/Address_Resolution_Protocol)
* [Definition](../../definitions/definitions_a#address-resolution-protocol)
