The Life of a Loop
If PC1 sends an ARP request into the network, SW1 receives it and knows that this frame belongs to VLAN 10 because of the access port it came in on, and forwards it out all other ports that are also assigned to VLAN 10, in addition to any trunk ports that are allowing VLAN 10. By default, trunk ports allow all VLAN traffic. So, this broadcast is tagged as belonging to VLAN 10, and is sent down ports 23 and 24.
Just for a moment, let’s follow just one of those ports. So, the traffic is being sent down port 23, and SW2 sees it and decides it needs to forward it out all other ports that are assigned to VLAN 10, which includes port number 2, which is an access port assigned to VLAN 10, and also the trunk port 24. So, now SW2 sends ...
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