Final answer:
The native VLAN supports untagged traffic.
Step-by-step explanation:
The type of VLAN that supports untagged traffic is the native VLAN.
A VLAN, or Virtual Local Area Network, is a way to segregate network traffic into different broadcast domains. VLANs can be configured to carry tagged or untagged traffic. Untagged traffic is traffic that does not have VLAN information included in its frame header. It is the responsibility of the switch to determine which VLAN the untagged traffic belongs to. The native VLAN is the default VLAN for untagged traffic and is used when a frame arrives that does not contain VLAN information.
For example, if a switch has been configured with VLANs 10, 20, and 30, and a frame arrives with no VLAN tag, the switch will assume that the traffic belongs to the native VLAN. Any ports that are configured as access ports for the native VLAN will receive this untagged traffic.