When a switch receive a data packet, it opens the packet, looks at the MAC address, then broadcasts to every device on the network asking who is the owner of the MAC address it just read, and then someone answers, and then the switch sends the packet to that PC. Then the switch holds that MAC address for 5 minutes so it doesnt have to keep asking for every packet it sees.
A MAC address is an address built into every single network card in the world. And every single one in the world has to have a different MAC address.
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