ARP is used as a translation layer between Internet Layer addresses and Network Interface Layer addresses. ARP on LAN links is used to resolve the next-hop IP address of a node to its corresponding MAC address, to detect IP address conflicts, and to determine neighbor reachability. InARP on Frame Relay links is used to map a DLCI value to the IP address of the node on the other end of the virtual circuit. Proxy ARP is used to subdivide an IP subnet and provide transparent communication without using an IP router.

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