Address Resolution Protocol


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. Address Resolution Protocol was defined in 1982 by RFC 826.

ARP has been implemented with many combinations of Network Layer and Data-link Layer technologies, such as:

In Internet Protocol Version 6 (IPv6) networks, the functionality of ARP is provided by the Neighbor Discovery Protocol (NDP).

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