JNCIS-ENT: Juniper Networks Certified Specialist – Enterprise Routing and Switching (2025) — Question 24

You are asked to connect an IP phone and a user computer using the same interface on an EX Series switch. The traffic from the computer does not use a VLAN tag, whereas the traffic from the IP phone uses a VLAN tag.
Which feature enables the interface to receive both types of traffic?

Answer options

• A. native VLAN
• B. DHCP snooping
• C. MAC limiting
• D. voice VLAN

Correct answer: D

Explanation

The correct answer is D, voice VLAN, as it allows the switch port to segregate voice traffic (tagged) from data traffic (untagged) on the same interface. The native VLAN (A) only pertains to untagged traffic and does not help with VLAN tagging. DHCP snooping (B) is related to security for DHCP messages, while MAC limiting (C) controls the number of MAC addresses allowed on a port, which does not address the issue of traffic types.