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What is a trunk port or VLAN trunk?
What is a trunk port or VLAN trunk?
Updated over a week ago

A trunk port (VLAN trunk) on a network switch is capable of handling traffic to and from multiple VLANs. Operating at Layer 2, the trunk port tags a data packet in the frame header designating which VLAN the packet should be delivered to.

The tags are known as 802.1Q tags or Inter-Switch Link (ISL) tags. While the tags allow for more efficient transmission of data, the trunk port can also still deliver untagged packets.

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