Cisco Certified Network Associate (CCNA) Practice Exam

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What does the command (config-if)#switchport trunk allowed vlan 10 achieve?

Allows only VLAN 10 on the trunk
Restricts VLAN 10 from accessing the trunk
Sets the native VLAN to 10
Changes the trunking mode to access for VLAN 10

The correct answer is: Allows only VLAN 10 on the trunk

The command (config-if)#switchport trunk allowed vlan 10 configures the switch port to allow only VLAN 10 on the trunk link. This means that any traffic that is tagged with VLAN IDs other than 10 will be dropped. Trunk ports are designed to carry traffic for multiple VLANs, and this command specifically filters the allowed VLANs on the link to just VLAN 10. By restricting the trunk to just one VLAN, it effectively isolates the traffic for that VLAN, ensuring that only devices on VLAN 10 can communicate through that trunk interface. This command is particularly useful in scenarios where you want to enforce strict VLAN segmentation and control, ensuring that only the specified VLAN can traverse a trunk link.