CCNP Infrastructure Practice Question
A network administrator is configuring a switch port to support a VoIP phone and a PC connected to the phone's internal switch. The phone must be placed in VLAN 50 and the PC in VLAN 60. Which configuration on the switch port achieves this?
⚠ Common exam trap
Candidates often confuse the access VLAN and voice VLAN assignments, or using trunk mode instead of the dedicated voice VLAN feature.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
switchport mode access switchport access vlan 60 switchport voice vlan 50
The correct configuration uses access VLAN 60 for the PC and voice VLAN 50 for the phone. Cisco voice VLAN allows the switch to instruct the phone to use a specific VLAN for voice traffic while the PC remains on the access VLAN. This provides proper segmentation and QoS for voice.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
switchport mode access switchport access vlan 50 switchport trunk allowed vlan 60
Why it's wrong here
This configuration uses access mode with VLAN 50, which would put the PC in VLAN 50. The trunk allowed vlan command is not valid in access mode and would not place the phone in a separate VLAN. This does not achieve the required VLAN separation.
- ✗
switchport mode access switchport access vlan 50 switchport voice vlan 60
Why it's wrong here
This configuration places the phone in VLAN 50 as an access port and configures voice VLAN 60 for a phone, but it reverses the required VLANs. The PC would be in VLAN 50, not VLAN 60, and the phone would not use VLAN 50 as intended. This does not meet the requirement.
- ✓
switchport mode access switchport access vlan 60 switchport voice vlan 50
Why this is correct
This configuration sets the access VLAN to 60 for the PC and the voice VLAN to 50 for the phone. The phone will use VLAN 50 for voice traffic and pass untagged PC traffic to VLAN 60. This is the standard Cisco configuration for a phone with a PC attached.
- ✗
switchport mode trunk switchport trunk native vlan 60 switchport trunk allowed vlan 50
Why it's wrong here
This trunk configuration would send untagged traffic to VLAN 60 and tagged VLAN 50 traffic. The phone typically uses untagged traffic for voice unless configured otherwise, so this would misplace the phone. It also does not use the voice VLAN feature, which is designed for this scenario.
Visual reference
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Cisco exam blueprint
This 350-401 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-401 exam.