4.0 IP Services

QoS & Voice VLANs Practice Questions

Quality of Service marking and voice VLAN configuration.

Author-reviewed by LabFabric · 7 September 2026 · Report a content issue

One solved question, so you can see how these are marked

On a switch access port connecting both a PC and an IP phone (with the PC plugged into the phone's built-in switch port), which command tells the switch which VLAN the phone's voice traffic belongs to?

switchport voice vlan <vlan-id>

switchport voice vlan assigns a separate voice VLAN to an access port, allowing an attached IP phone's traffic to be tagged and separated from the PC's untagged data traffic on the same physical port.

Every question in the set below is marked like this. The answers stay hidden until you pick one.

Find related practice in the CCNA path