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Wednesday, November 2, 2016

What is Address Resolution Protocol (ARP)? - Definition from WhatIs.com

What is Address Resolution Protocol (ARP)? - Definition from WhatIs.com
















Address Resolution Protocol (ARP) is a protocol for mapping an Internet Protocol address (IP address)
to a physical machine address that is recognized in the local network.
For example, in IP Version 4, the most common level of IP in use today,
an address is 32 bits long. In an Ethernet
local area network, however, addresses for attached devices are 48 bits
long. (The physical machine address is also known as a Media Access
Control or MAC address.)
A table, usually called the ARP cache, is used to maintain a
correlation between each MAC address and its corresponding IP address.
ARP provides the protocol rules for making this correlation and
providing address conversion in both directions.

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