What is Address Resolution Protocol (ARP)?

ARP is like a translator for internet addresses. Watch to learn more about what ARP is, how it works, and why it's important.

Address resolution protocol, or ARP, has one job -- but an important one. It’s responsible for mapping an IP address to a permanent physical machine address in a local area network (LAN) and translating 32-bit IP addresses into 48-bit MAC addresses, which is critical for two computers to share information and communicate.

When data arrives at the gateway to a host machine, the ARP program either finds a preexisting translation, and if not, performs the ARP process.

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[TheRapRocka]

Great breakdown! Just what I needed to fill in the gaps, thanks!