![]() ![]() It enables devices to communicate with each other using IP addresses while relying on MAC addresses for actual data transmission. ARP allows devices to dynamically discover the MAC addresses of other devices on the local network, eliminating the need for manual configuration. The ARP cache is a table that keeps track of the IP-to-MAC address mappings for faster future communication. Upon receiving the ARP reply, the sending device updates its ARP cache with the IP-to-MAC address mapping. The ARP reply contains the MAC address of the responding device. The device with the IP address mentioned in the ARP request responds with an ARP reply. This is because the sending device does not know the MAC address of the desired device, so it sends the request to all devices. The ARP request is broadcasted to all devices on the local network. The ARP request has the IP address of the desired device and the MAC address of the sending device. ![]() When a device wants to know the MAC address corresponding to a specific IP address, it first sends an ARP request to the local network. Here is how ARP works to convert IP addresses to MAC addresses: However, devices use IP addresses to communicate with each other at the network layer. When a device wants to communicate with another device on the same local network, it needs to know the MAC address of the destination device. ARP is a communication protocol that is used to map an IP address to a physical (MAC) address on a local network. The protocol used to convert IP addresses to MAC addresses is ARP (Address Resolution Protocol). ![]()
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