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a trunk port is required to forward multiple vlans between switches. each ethernet frame is tagged with vlan membership. The trunk port is configured with 802.1q encapsulation to carry the vlan membership in an Ethernet frame.


No, An access port is not tagged. A vlan tag indentifier is only added to the frame when it traverses a Trunk port, simple as that. the port configuration of "access vlan 20" for example, is simply telling the switch which vlan it belongs too. if the destination is the same vlan and on the same switch, NO tagging occurs at all.

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