Which VLAN is dedicated for VoIP traffic to allow QoS prioritization of voice traffic?

Which VLAN is dedicated for VoIP traffic to allow QoS prioritization of voice traffic?

• A. Management VLAN
• B. Data VLAN
• C. Voice VLAN
• D. Native VLAN

Answer: (C)

The main idea being tested is using a dedicated network segment to carry voice traffic so QoS can be applied effectively. A Voice VLAN is designed to carry VoIP traffic separately from data, allowing QoS policies to be tuned specifically for voice—targeting low latency, minimal jitter, and reliable delivery. By placing VoIP traffic on its own VLAN, the switch can prioritize those frames (often by trusting or marking them with high-priority DSCP/CoS) and keep them separate from regular data traffic, which reduces contention and helps call quality across the network. The Management VLAN is for switch management, the Data VLAN carries typical user data, and the Native VLAN is used for untagged frames on a trunk; none of these are dedicated to VoIP with QoS in mind. Therefore, the VLAN dedicated for VoIP traffic to allow QoS prioritization is the Voice VLAN.

The main idea being tested is using a dedicated network segment to carry voice traffic so QoS can be applied effectively. A Voice VLAN is designed to carry VoIP traffic separately from data, allowing QoS policies to be tuned specifically for voice—targeting low latency, minimal jitter, and reliable delivery. By placing VoIP traffic on its own VLAN, the switch can prioritize those frames (often by trusting or marking them with high-priority DSCP/CoS) and keep them separate from regular data traffic, which reduces contention and helps call quality across the network. The Management VLAN is for switch management, the Data VLAN carries typical user data, and the Native VLAN is used for untagged frames on a trunk; none of these are dedicated to VoIP with QoS in mind. Therefore, the VLAN dedicated for VoIP traffic to allow QoS prioritization is the Voice VLAN.