How ARP Works: Understanding ARP Requests, Replies, and ARP Cache Address Resolution Protocol (ARP) is an essential protocol in the world of networking. It's responsible for mapping IP addresses to MAC addresses within a local area network (LAN). ๐ How ARP Works When a host wants to communicate with another device, it needs the MAC address associated with the destination IP. If the MAC address is unknown, the host sends out a broadcast ARP Request asking: ๐จ️ “Who has IP address X.X.X.X? Tell me your MAC address.” The device with the matching IP sends an ARP Reply with its MAC address, allowing communication to begin. ๐จ ARP Messages ARP uses two packet types: ARP Request Destination MAC: FF-FF-FF-FF-FF-FF (broadcast) Target MAC: 00-00-00-00-00-00 (unknown) ARP Reply Uses unicast MAC addresses for both source and destination Header Fields Include: Source MAC and IP Target MAC and IP ๐งช Real-World Examples Host-to-Host on Same Network PC2 want...
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