- A
A switch port configured as a trunk port can simultaneously carry untagged traffic for the native VLAN and tagged traffic for multiple other VLANs.
Trunk ports support one native VLAN (untagged) and allow tagged traffic for additional VLANs listed in the allowed VLAN list.
- B
When a port is configured with both an access VLAN and a voice VLAN, the switchport must be set to trunk mode.
Why wrong: Voice VLAN is configured on an access port with 'switchport voice vlan' while the port remains in access mode.
- C
The switchport mode dynamic auto command sets the port to actively attempt to form a trunk if the neighbor initiates negotiation.
Why wrong: Dynamic auto only responds to DTP negotiation initiated by the neighbor; it never initiates trunking on its own.
- D
An access port with a voice VLAN configured sends CDP or LLDP information to the IP phone to identify the voice VLAN.
Cisco Discovery Protocol (CDP) or Link Layer Discovery Protocol (LLDP) carries voice VLAN ID to IP phones, allowing them to tag voice traffic correctly.
- E
Issuing the switchport trunk allowed vlan command automatically includes the native VLAN in the allowed list, so it never needs to be explicitly added.
Why wrong: The allowed VLAN list does not automatically include the native VLAN; you must explicitly add it if you want native VLAN traffic to traverse the trunk.
Quick Answer
The answer is that an access port with a voice VLAN configured sends CDP or LLDP information to the IP phone to identify the voice VLAN, and a trunk port carries untagged frames for the native VLAN while carrying tagged frames for all other allowed VLANs. These two statements are correct because the access-voice configuration relies on Cisco Discovery Protocol or Link Layer Discovery Protocol to dynamically convey the voice VLAN ID to the phone, ensuring voice traffic is separated from data traffic on the same physical link. Meanwhile, the trunk port behavior is rooted in IEEE 802.1Q standards, where the native VLAN remains untagged for backward compatibility with legacy devices that cannot process VLAN tags. On the CCNA 200-301 v2 exam, this topic tests your understanding of switchport mode and VLAN segmentation, often appearing in scenario-based questions where you must distinguish between native VLAN untagged traffic and tagged traffic for other VLANs. A common trap is assuming all frames on a trunk are tagged, so remember: native VLAN frames ride untagged, while all others wear a tag.
CCNA Switching and Network Access Practice Question
This 200-301 practice question tests your understanding of switching and network access. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 are true regarding switch port configuration for access, voice, and trunk ports?
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
A switch port configured as a trunk port can simultaneously carry untagged traffic for the native VLAN and tagged traffic for multiple other VLANs.
Option A is correct because a trunk port, by definition, carries untagged frames for the native VLAN (typically VLAN 1 unless changed) and simultaneously carries tagged frames for all other VLANs allowed on the trunk. This behavior is fundamental to IEEE 802.1Q trunking, where the native VLAN is the only VLAN whose frames are sent untagged to maintain backward compatibility with devices that do not understand VLAN tagging.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
A switch port configured as a trunk port can simultaneously carry untagged traffic for the native VLAN and tagged traffic for multiple other VLANs.
Why this is correct
Trunk ports support one native VLAN (untagged) and allow tagged traffic for additional VLANs listed in the allowed VLAN list.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
When a port is configured with both an access VLAN and a voice VLAN, the switchport must be set to trunk mode.
Why it's wrong here
Voice VLAN is configured on an access port with 'switchport voice vlan' while the port remains in access mode.
- ✗
The switchport mode dynamic auto command sets the port to actively attempt to form a trunk if the neighbor initiates negotiation.
Why it's wrong here
Dynamic auto only responds to DTP negotiation initiated by the neighbor; it never initiates trunking on its own.
- ✓
An access port with a voice VLAN configured sends CDP or LLDP information to the IP phone to identify the voice VLAN.
Why this is correct
Cisco Discovery Protocol (CDP) or Link Layer Discovery Protocol (LLDP) carries voice VLAN ID to IP phones, allowing them to tag voice traffic correctly.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Issuing the switchport trunk allowed vlan command automatically includes the native VLAN in the allowed list, so it never needs to be explicitly added.
Why it's wrong here
The allowed VLAN list does not automatically include the native VLAN; you must explicitly add it if you want native VLAN traffic to traverse the trunk.
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.
✓A switch port configured as a trunk port can simultaneously carry untagged traffic for the native VLAN and tagged traffic for multiple other VLANs.Correct answer▾
Why this is correct
Trunk ports support one native VLAN (untagged) and allow tagged traffic for additional VLANs listed in the allowed VLAN list.
✗When a port is configured with both an access VLAN and a voice VLAN, the switchport must be set to trunk mode.Wrong answer — click to see why▾
Why this is wrong here
Multi-VLAN access ports (access + voice) stay in access mode; trunk mode is not required and would incorrectly pass all VLANs.
✗The switchport mode dynamic auto command sets the port to actively attempt to form a trunk if the neighbor initiates negotiation.Wrong answer — click to see why▾
Why this is wrong here
Dynamic desirable actively initiates, but dynamic auto is passive.
✗Issuing the switchport trunk allowed vlan command automatically includes the native VLAN in the allowed list, so it never needs to be explicitly added.Wrong answer — click to see why▾
Why this is wrong here
When you prune the allowed VLANs, any omitted VLANs (including the native VLAN) are blocked unless added back.
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: answer the scenario, not the keyword
Cisco often tests the distinction between 'dynamic auto' and 'dynamic desirable' DTP modes, where candidates mistakenly think 'auto' actively initiates trunk negotiation, when in fact it only responds to incoming DTP messages.
Detailed technical explanation
How to think about this question
Under the hood, the native VLAN on an 802.1Q trunk is a critical concept: frames in the native VLAN are sent without a VLAN tag, and the receiving switch assumes they belong to the native VLAN configured on that interface. If the native VLAN mismatches between two trunk endpoints, frames can be misclassified into the wrong VLAN, leading to connectivity issues or security vulnerabilities (VLAN hopping). In real-world deployments, it is a best practice to change the native VLAN from the default VLAN 1 to an unused VLAN to reduce security risks.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
What to study next
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FAQ
Questions learners often ask
What does this 200-301 question test?
Switching and Network Access — This question tests Switching and Network Access — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: A switch port configured as a trunk port can simultaneously carry untagged traffic for the native VLAN and tagged traffic for multiple other VLANs. — Option A is correct because a trunk port, by definition, carries untagged frames for the native VLAN (typically VLAN 1 unless changed) and simultaneously carries tagged frames for all other VLANs allowed on the trunk. This behavior is fundamental to IEEE 802.1Q trunking, where the native VLAN is the only VLAN whose frames are sent untagged to maintain backward compatibility with devices that do not understand VLAN tagging.
What should I do if I get this 200-301 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
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