1C0X2 Apprentice Course Block III Complete Practice Test 2026

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What does VLAN tagging on trunk links enable?

Allows carrying multiple VLANs over a single physical link by tagging frames with VLAN IDs

Encrypts frames on the trunk

Increases latency of frames

Replaces MAC learning on switches

VLAN tagging on trunk links enables carrying multiple VLANs over a single physical link by tagging frames with VLAN IDs. This 802.1Q tagging allows switches on both ends of the trunk to identify which VLAN each frame belongs to, so traffic from different VLANs can share the same cable while remaining isolated. The tag doesn’t provide encryption, so it doesn’t secure the data, and it doesn’t inherently add meaningful latency. It also doesn’t replace MAC learning, which is still needed for mapping devices to ports within each VLAN to forward frames correctly.