Which statement is correct about native VLANs?

A. Any traffic tagged will be placed on the native VLAN.
B. Any traffic that is not allowed over the trunk will be placed on the native VLAN.
C. Any traffic not tagged will be placed on the native VLAN.
D. Any traffic that is tagged with ISL on an 802.1Q trunk will be placed on the native VLAN.

C. Native VLANs are only used for traffic that is not tagged, which is placed on a trunk link. A common use for native VLANs is management traffic between switches, before both sides are configured as a trunk.