![]() Network hosts will automatically cache any ARP replies they receive, regardless of whether network hosts requested them. The destination machine with the IP in the ARP request then responds with an ARP reply that contains the MAC address for that IP. When another host's IP address is known, and its MAC address is needed, a broadcast packet is sent out on the local network. When an Internet Protocol (IP) datagram is sent from one host to another in a local area network, the destination IP address must be resolved to a MAC address for transmission via the data link layer. ![]() The Address Resolution Protocol (ARP) is a widely used communications protocol for resolving Internet layer addresses into link layer addresses.
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