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CCNA Practice Question: Which TWO statements correctly describe the…
This 200-301 practice question tests your understanding of 200-301 exam topics. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which TWO statements correctly describe the configuration and use of a voice VLAN on a Cisco switch port?
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
✓
When a voice VLAN is configured, the switch port operates in two VLANs: one for data and one for voice traffic.
Voice VLANs allow IP phones to be placed on a separate VLAN from data devices, improving QoS and security. On a Cisco switch, the voice VLAN is configured using the `switchport voice vlan` command, and when a phone is connected, it uses CDP or LLDP to request a VLAN assignment. The port then operates in two VLANs: one for data (access VLAN) and one for voice (voice VLAN).
Key principle: A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The voice VLAN is configured using the 'switchport mode trunk' command.
Why it's wrong here
The voice VLAN is not configured with a trunk command; it is configured with the 'switchport voice vlan' command.
- ✓
When a voice VLAN is configured, the switch port operates in two VLANs: one for data and one for voice traffic.
Why this is correct
With voice VLAN, the port is an access port for the data VLAN and also accepts tagged traffic on the voice VLAN, effectively operating in two VLANs.
Related concept
Access ports place end devices into a single VLAN.
- ✗
The voice VLAN must be the same as the native VLAN on the trunk link.
Why it's wrong here
The voice VLAN is independent of the native VLAN; it is a separate VLAN assigned to voice traffic.
- ✓
The IP phone uses CDP or LLDP to learn the voice VLAN ID from the switch.
Why this is correct
Cisco IP phones use CDP (or LLDP) to discover the voice VLAN configured on the switch port and then automatically tag their voice traffic with that VLAN ID.
Related concept
Access ports place end devices into a single VLAN.
- ✗
The data VLAN and voice VLAN must be in the same IP subnet.
Why it's wrong here
Data and voice VLANs are typically in different IP subnets to separate traffic and apply QoS policies.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 200-301 exam frequently reuses these exact scenarios with slightly different constraints.
✓When a voice VLAN is configured, the switch port operates in two VLANs: one for data and one for voice traffic.Correct answer▾
Why this is correct
With voice VLAN, the port is an access port for the data VLAN and also accepts tagged traffic on the voice VLAN, effectively operating in two VLANs.
✗The voice VLAN is configured using the 'switchport mode trunk' command.Wrong answer — click to see why▾
Why this is wrong here
Trunk mode is used to carry multiple VLANs, but for a single access port with voice, the port remains in access mode and uses the voice VLAN feature.
✗The voice VLAN must be the same as the native VLAN on the trunk link.Wrong answer — click to see why▾
Why this is wrong here
The native VLAN is used for untagged traffic on a trunk, while the voice VLAN is a specific VLAN that carries tagged voice traffic from the phone.
✗The data VLAN and voice VLAN must be in the same IP subnet.Wrong answer — click to see why▾
Why this is wrong here
They are separate VLANs and usually belong to different subnets for logical separation and management.
Analysis generated from the official 200-301blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: an active trunk can still block the VLAN you need
A trunk being up does not prove every VLAN is crossing it. Check allowed VLAN lists, native VLAN mismatch, VLAN existence and access-port assignment.
Trap categories for this question
Command / output trap
The voice VLAN is not configured with a trunk command; it is configured with the 'switchport voice vlan' command.
Detailed technical explanation
How to think about this question
VLAN questions usually combine access-port and trunking clues. The key is to identify whether the issue is local to one switchport, caused by the trunk, or caused by the VLAN not existing where it needs to exist.
KKey Concepts to Remember
- Access ports place end devices into a single VLAN.
- Trunk ports carry multiple VLANs between switches.
- Allowed VLAN lists decide which VLANs can cross a trunk.
- Native VLAN mismatch can create confusing symptoms.
TExam Day Tips
- Use show vlan brief to verify access VLANs.
- Use show interfaces trunk to verify trunk state and allowed VLANs.
- Do not treat every same-VLAN issue as a routing problem.
Key takeaway
A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.
Real-world example
How this comes up in practice
A help-desk technician troubleshoots why a newly connected PC cannot reach shared printers on the same floor. The cable is good, the switch port is active, but the PC is in VLAN 20 and the printers are in VLAN 10. The uplink trunk only allows VLAN 10. A trunk being up does not mean every VLAN crosses it.
What to study next
Got this wrong? Here's your next step.
Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related 200-301 questions on switching, trunking, and access-port configuration.
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FAQ
Questions learners often ask
What does this 200-301 question test?
Access ports place end devices into a single VLAN.
What is the correct answer to this question?
The correct answer is: When a voice VLAN is configured, the switch port operates in two VLANs: one for data and one for voice traffic. — Voice VLANs allow IP phones to be placed on a separate VLAN from data devices, improving QoS and security. On a Cisco switch, the voice VLAN is configured using the `switchport voice vlan` command, and when a phone is connected, it uses CDP or LLDP to request a VLAN assignment. The port then operates in two VLANs: one for data (access VLAN) and one for voice (voice VLAN).
What should I do if I get this 200-301 question wrong?
Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related 200-301 questions on switching, trunking, and access-port configuration.
What is the key concept behind this question?
Access ports place end devices into a single VLAN.
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