ARP is used to find the MAC address of a host when the IP address is known.

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ARP is used to find the MAC address of a host when the IP address is known.

ARP maps an IPv4 address to a MAC address on a local network. When a host wants to send a frame to another host on the same LAN, it needs the destination’s hardware address. It broadcasts an ARP request asking who owns that IP, and the matching host replies with its MAC address, which the requester then caches for future use. DNS resolves hostnames to IP addresses, not MACs, and DHCP provides IP configuration rather than MAC mappings. Note that ARP is for IPv4; IPv6 uses Neighbor Discovery for address resolution.

ARP maps an IPv4 address to a MAC address on a local network. When a host wants to send a frame to another host on the same LAN, it needs the destination’s hardware address. It broadcasts an ARP request asking who owns that IP, and the matching host replies with its MAC address, which the requester then caches for future use. DNS resolves hostnames to IP addresses, not MACs, and DHCP provides IP configuration rather than MAC mappings. Note that ARP is for IPv4; IPv6 uses Neighbor Discovery for address resolution.

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