![]() Host A will receive the reply and the communication between the two devices can be established. Every device on the LAN will receive the request, but only the device with the IP address of 10.0.0.2 will process it and send an ARP reply message, listing its MAC address. Because the ARP request is sent to the broadcast address, the switch will flood the request out all interfaces. Host A doesn’t know the MAC address of the host with that IP address, so it will send an ARP request, requesting the MAC address. Host A wants to communicate with the host with the IP address of 10.0.0.2. It is a request-reply protocol ARP request messages are used to request the MAC address, while ARP reply messages are used to send the requested MAC address. ![]() ARP is used on Ethernet LANs because hosts that want to communicate with each other need to know their respective MAC addresses. This protocol aims to create communication between two devices on a local area network (Ethernet) by providing the other devices MAC address. ![]() Address Resolution Protocol (ARP) is a network protocol used to find the hardware ( MAC) address of a host from an IP address.
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