![]() That was how traffic works with a single switch. It knows that it’s available on Port 1, so it sends it out only to that port. Then, it will send the frame out only of Port 1, because it sees that the destination MAC address is 1.1.1. It will put that information into its MAC address table. The switch will see that traffic has come from a source of 2.2.2 and it came from Port 2. It sends a reply from the source MAC of 2.2.2 itself to the destination MAC address of 1.1.1. The host of 2.2.2 is going to send some traffic back. So, it will just silently discard the frame. Host 3.3.3 will see that the destination MAC address is 2.2.2. It’s an unknown unicast address, so the switch will flood it out all ports apart from the one it was received on. ![]() The destination of 2.2.2 is not in the MAC address table yet. The switch learns that 1.1.1 is reachable on Port 1, and it puts that information into the MAC address table. It sees a frame coming in with the source MAC of 1.1.1, the destination MAC of 2.2.2. The host on the left, 1.1.1, sends a frame in with the destination MAC address of 2.2.2. Right now, we’ve just powered everything on, so there’s nothing in the MAC address table yet. 2.2.2 is plugged into Port 2 and 3.3.3 is plugged into Port 3. I’ve just written it in shorthand here as 1.1.1 to keep things a bit more simple. We’ve got a host with MAC address 1111.1111.1111 plugged into Port 1. For our first example, we’ve got one switch here.
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May 2023
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