That means that next time the switch receives a frame with this MAC address as a destination, it will know –by looking in its address table- to which port to forward that frame. Every time a switch receives a new frame, it stores the source MAC address of that frame along with the port from where it received it in its table. But how does a switch actually think and take forwarding decisions?Ī switch learns MAC addresses from the frames it receives and then stores this information in an internal table. A switch is a layer 2 device, which means that it processes frames and forwards them based on MAC addresses.
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