When the switch knows the destination port, it forwards. The frame goes only to that specific port. Other ports never see it. This is the normal, efficient operation. Forwarding uses the MAC table lookup, which happens in hardware (ASICs). Modern switches forward millions of frames per second with microsecond latency. I'll explain the third decision next: filtering.
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$ curl repovive.com/roadmaps/network-design/physical-and-data-link-fundamentals/switch-forwarding
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