Untaggedliikenne

Untaggedliikenne refers to network traffic that is not associated with a Virtual Local Area Network (VLAN) tag. In a standard Ethernet network, traffic is often categorized into different VLANs to segment the network logically, improving security and manageability. When a frame is sent without a VLAN tag, it is considered untagged.

When a switch receives an untagged frame, it typically forwards it to all ports that belong to the same VLAN as the port where the frame entered, unless specific configurations dictate otherwise. This is often referred to as the "native VLAN." The native VLAN is a key concept in VLAN trunking, where multiple VLANs are carried over a single physical link. The untagged traffic on a trunk link is by default associated with the native VLAN.

The use of untagged traffic can be a security consideration. If not managed carefully, untagged frames can inadvertently cross VLAN boundaries or be exposed to unintended recipients. Network administrators often configure switches to ensure that only expected untagged traffic is processed and that sensitive data is always transmitted within tagged VLANs. This practice helps maintain network segmentation and control access to resources.