Cisco Certified Network Associate (CCNA) 200-301 — Question 1044

The correct answer is A. Option A: Switch(config-if)#switchport mode trunkSwitch(config-if)#switchport trunk encapsulation dot1qSwitch(config-if)#switchport trunk allowed vlan 100,105Switch(config-if)#switchport trunk native vlan 3

Explanation

A trunk carries traffic for multiple VLANs between network devices. Frames in the native VLAN are untagged by default on an 802.1Q trunk. A VLAN creates a separate Layer 2 broadcast domain on switched infrastructure. This option keeps traffic private / properly secured as required.