| Exam 300-115 | Question id=1334 | Layer 2 Technologies |
Which technique allows specific VLANs to be strictly permitted by the administrator?
| A. |
VTP pruning | |
| B. |
transparent bridging | |
| C. |
trunk allowed VLANs | |
| D. |
VLAN access-list | |
| E. |
L2P tunneling |
By default, a trunk port sends traffic to and receives traffic from all VLANs. All VLAN IDs, 1 to 4094, are allowed on each trunk. However, you can remove VLANs from the allowed list, preventing traffic from those VLANs from passing over the trunk. To restrict the traffic a trunk carries, use the switchport trunk allowed vlan remove vlan-list interface configuration command to remove specific VLANs from the allowed list.