When a switch receives a frame, it associates the media access control (MAC) address of the sending device with the port on which it was received. ![]() Switches also use MAC addresses to make accurate forwarding or filtering decision. Devices that want to communicate need to know each other MAC addresses before sending out packets. This address is used in LANs for communication between devices on the same network segment. ![]() ![]() Each network card has a unique identifier called a Media Access Control (MAC) address.
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