An ARP (Address Resolution Protocol) request is broadcast to resolve an IP address to a MAC address. The source MAC is the sender’s MAC address, and the destination MAC is the broadcast address (FF:FF:FF:FF:FF:FF) to reach all devices on the local network. Fortinet devices handle ARP for Layer 2 communication. Options B, C, and D are incorrect as switches don’t originate ARP requests, the target’s MAC is unknown, and ARP uses broadcast, not multicast. Exact extract: "In an ARP request, the source MAC address is that of the sending device, and the destination MAC address is the broadcast address (FF:FF:FF:FF:FF:FF), sent to all devices in the local network segment."
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