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# 1.2.4.1 ARP Module

The Address Resolution Protocol, or ARP, is a foundation layer_of TCP/IP. It translates IP addresses to physical MAC addresses

TCP and UDP applications will not need to access ARP directly. The IPv4 module will handle the ARP operations transparently.

Responses to incoming ARP requests are processed automatically. Resolution of ARP requests follows a simple state machine, as indicated in the following diagram.