- A
Trunk: Carries traffic for multiple VLANs over a single link.
This is correct because a trunk port uses 802.1Q tagging to multiplex traffic from multiple VLANs over one physical link, allowing efficient use of bandwidth.
- B
VLAN: Provides a method to tag frames for multiple VLANs on a trunk.
Why wrong: This is incorrect because VLANs logically segment a network into separate broadcast domains; tagging is a function of the trunking protocol (802.1Q), not the VLAN itself.
- C
Native VLAN: Used to route traffic between different VLANs.
Why wrong: This is incorrect because the native VLAN is the VLAN that carries untagged traffic on a trunk; inter-VLAN routing is performed by a router or Layer 3 switch, not by the native VLAN.
- D
802.1Q: Distributes VLAN configuration information across switches.
Why wrong: This is incorrect because 802.1Q is the IEEE standard for VLAN tagging on trunk links; distributing VLAN configuration is the function of VTP (VLAN Trunking Protocol), not 802.1Q.
CCNA Switching and Network Access Practice Question
This 200-301 practice question tests your understanding of switching and network access. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. A key principle to apply: a trunk port carries traffic for multiple VLANs simultaneously by tagging frames with VLAN identifiers using 802.1Q encapsulation.. 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.
Match each VLAN or trunk term to its most accurate purpose.
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
Trunk: Carries traffic for multiple VLANs over a single link.
Trunks enable multiple VLANs on one link; VLANs logically segment networks. 802.1Q is the tagging standard; native VLAN is untagged. VTP distributes VLAN database; inter-VLAN routing uses a router or Layer 3 switch to communicate between VLANs.
Key principle: A trunk port carries traffic for multiple VLANs simultaneously by tagging frames with VLAN identifiers using 802.1Q encapsulation.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Trunk: Carries traffic for multiple VLANs over a single link.
Why this is correct
This is correct because a trunk port uses 802.1Q tagging to multiplex traffic from multiple VLANs over one physical link, allowing efficient use of bandwidth.
Related concept
A trunk port carries traffic for multiple VLANs simultaneously by tagging frames with VLAN identifiers using 802.1Q encapsulation.
- ✗
VLAN: Provides a method to tag frames for multiple VLANs on a trunk.
Why it's wrong here
This is incorrect because VLANs logically segment a network into separate broadcast domains; tagging is a function of the trunking protocol (802.1Q), not the VLAN itself.
- ✗
Native VLAN: Used to route traffic between different VLANs.
Why it's wrong here
This is incorrect because the native VLAN is the VLAN that carries untagged traffic on a trunk; inter-VLAN routing is performed by a router or Layer 3 switch, not by the native VLAN.
- ✗
802.1Q: Distributes VLAN configuration information across switches.
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.
✓Trunk: Carries traffic for multiple VLANs over a single link.Correct answer▾
Why this is correct
This is correct because a trunk port uses 802.1Q tagging to multiplex traffic from multiple VLANs over one physical link, allowing efficient use of bandwidth.
✗VLAN: Provides a method to tag frames for multiple VLANs on a trunk.Wrong answer — click to see why▾
Why this is wrong here
The specific factual error is confusing the purpose of a VLAN (network segmentation) with the mechanism of trunk tagging.
Why candidates choose this
Candidates pick this because they associate VLANs with tags, but tagging is a trunk feature, not a VLAN's primary purpose.
✗Native VLAN: Used to route traffic between different VLANs.Wrong answer — click to see why▾
Why this is wrong here
The specific factual error is attributing routing functionality to the native VLAN, which is a trunking concept.
Why candidates choose this
Candidates pick this because 'native' sounds like it might be the default VLAN used for routing, but it is actually for untagged frames on a trunk.
✗802.1Q: Distributes VLAN configuration information across switches.Wrong answer — click to see why▾
Why this is wrong here
The specific factual error is confusing the tagging standard with a protocol that propagates VLAN information.
Why candidates choose this
Candidates pick this because both 802.1Q and VTP are associated with VLANs across switches, but they serve different purposes.
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
Do not confuse the purpose of a VLAN (segmentation) with trunk tagging (802.1Q) or VLAN distribution (VTP). Also, remember that the native VLAN is not used for routing; it is for untagged traffic on a trunk.
Detailed technical explanation
How to think about this question
VLANs (Virtual Local Area Networks) segment a physical network into multiple logical networks, improving security and traffic management. Access ports are switch ports assigned to a single VLAN and carry untagged frames from endpoint devices like PCs or printers. Trunk ports, by contrast, carry traffic for multiple VLANs simultaneously by tagging frames with VLAN IDs using the IEEE 802.1Q standard. This tagging allows switches to identify which VLAN each frame belongs to as it traverses the trunk link. The native VLAN is a special VLAN configured on 802.1Q trunk ports to handle untagged traffic. Frames belonging to the native VLAN are sent without VLAN tags, allowing compatibility with devices or links that do not support VLAN tagging. Both ends of a trunk link must agree on the native VLAN to prevent VLAN mismatches, which can cause traffic to be misrouted or dropped. Additionally, trunk ports can be configured with an allowed VLAN list, which restricts the VLANs permitted to cross the trunk. This feature enhances security and reduces unnecessary broadcast traffic by limiting VLAN propagation. A common exam trap involves confusing the native VLAN with the access VLAN or misunderstanding the role of allowed VLAN lists. The native VLAN only applies to untagged frames on trunks, not access ports. Access VLANs are assigned to access ports and do not involve tagging. Misconfiguring native VLANs or allowed VLAN lists can lead to VLAN leaks or traffic loss. Practically, network engineers must ensure consistent native VLAN settings on both trunk ends and carefully manage allowed VLAN lists to maintain VLAN segmentation and network stability.
KKey Concepts to Remember
- A trunk port carries traffic for multiple VLANs simultaneously by tagging frames with VLAN identifiers using 802.1Q encapsulation.
- An access VLAN is assigned to an endpoint-facing switch port and carries untagged traffic for a single VLAN only.
- The native VLAN on an 802.1Q trunk port handles untagged frames and is used to maintain backward compatibility with non-802.1Q devices.
- The allowed VLAN list on a trunk port restricts which VLANs are permitted to traverse the trunk link, enhancing security and traffic management.
- Switchports configured as access ports do not tag frames, so all traffic is assumed to belong to the configured access VLAN.
- Trunk ports use VLAN tagging to differentiate traffic from multiple VLANs on the same physical link, enabling VLAN segmentation across switches.
- The native VLAN must be the same on both ends of a trunk link to avoid VLAN mismatches and potential traffic loss or security issues.
- Allowed VLAN lists help prevent unnecessary VLAN traffic on trunk links, reducing broadcast domains and improving network efficiency.
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
A trunk port carries traffic for multiple VLANs simultaneously by tagging frames with VLAN identifiers using 802.1Q encapsulation.
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 a trunk port carries traffic for multiple VLANs simultaneously by tagging frames with VLAN identifiers using 802.1Q encapsulation., then practise related 200-301 questions on the same topic to reinforce the concept.
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Switching and Network Access — study guide chapter
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Switching and Network Access practice questions
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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 — A trunk port carries traffic for multiple VLANs simultaneously by tagging frames with VLAN identifiers using 802.1Q encapsulation..
What is the correct answer to this question?
The correct answer is: Trunk: Carries traffic for multiple VLANs over a single link. — Trunks enable multiple VLANs on one link; VLANs logically segment networks. 802.1Q is the tagging standard; native VLAN is untagged. VTP distributes VLAN database; inter-VLAN routing uses a router or Layer 3 switch to communicate between VLANs.
What should I do if I get this 200-301 question wrong?
Review a trunk port carries traffic for multiple VLANs simultaneously by tagging frames with VLAN identifiers using 802.1Q encapsulation., then practise related 200-301 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
A trunk port carries traffic for multiple VLANs simultaneously by tagging frames with VLAN identifiers using 802.1Q encapsulation.
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Last reviewed: Apr 12, 2026
This 200-301 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 200-301 exam.
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