IEEE 802.1Q

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Figure 1: Trunk between two switches carrying traffic from VLAN 100 and VLAN 200 between the Switches

The IEEE 802.1Q trunk protocol connects two or more Ethernet or Token Ring switches, and allows transmission of packets between Switches sharing the same VLAN(s).

Principle

In figure 1 all PC's connected to ports which are in VLAN 100 - Blue - can communicate together, and all PC's connected to ports in VLAN 200 - Red - can communicate together. In figure 1 there can be no exchange of packets between VLAN 100 and VLAN 200.

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