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So the frame gets broadcasted throughout the broadcast domain, until the end device with a matching MAC address responds to the broadcast, thus giving the switch a new source address to add to its MAC table. It duplicates the frame to all Ethernetports, except the port it came from.
The MAC address is used in layer -2. In Ethernet LAN segment,MAC address is expected to uniquely identify each node on that segment. ARP (address resolution protocol) to find a physical host or MAC address that matches the IP address. Coming to your question how to i locate a device using mac address.