What does the command vlan dot1q tag native accomplish when configured under global configuration?
A. All frames within the native VLAN are tagged, except when the native VLAN is set to 1.
B. It allows control traffic to pass using the non-default VLAN.
C. It removes the 4-byte dot1q tag from every frame that traverses the trunk interface(s).
D. Control traffic is tagged.
B is correct, this is from the book
Although maintenance protocols such as Cisco Discovery Protocol (CDP), Port
Aggregation Protocol (PAgP), and Dynamic Trunking Protocol (DTP) normally are carried
over the native VLAN of a trunk, they will not be affected if the native VLAN is removed
or manually pruned from the trunk. They still will be sent and received on the native
VLAN as a special case even if the native VLAN ID is not in the list of allowed VLANs.
Hey , I think answer D is incorrect.
Because “control traffic continues to be accepted as untagged on the native VLAN on a trunked port, even when the vlan dot1q tag native command is enabled.”
https://www.cisco.com/c/m/en_us/techdoc/dc/reference/cli/nxos/commands/l2/vlan-dot1q-tag-native.html
So because of that I think the correct answer is B