(Switch packet forwarding range: We know that switches can distinguish vlans. The so-called mac address learning is actually a concept in the same vlan (affected by the broadcasting principle). It can be said that the construction of the mac address table is based on vlan come. To put it bluntly, the packet forwarding of the switch is layer 2 forwarding. We distinguish VLANs, and the packet forwarding between VLANs is the concept of layer 3.
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