- A
Trunk port: Carries traffic for multiple VLANs using tagging
A trunk port is configured to carry traffic for multiple VLANs, typically using 802.1Q tagging to identify VLAN membership.
- B
Access port: Carries traffic for a single VLAN
An access port belongs to a single VLAN and does not tag frames; it is used for end-device connections, not for carrying multiple VLANs.
- C
Native VLAN: Untagged traffic on a trunk port
802.1Q is the IEEE standard for VLAN tagging, not a type of switchport. It defines how VLAN information is inserted into Ethernet frames on trunk links.
- D
VLAN tagging: Adding 802.1Q header to identify VLAN membership
The native VLAN is the VLAN that carries untagged traffic on a trunk port. It is not a port type but a VLAN assigned to a trunk for untagged frames.
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 802.1Q VLAN identifiers to maintain VLAN separation across switches.. 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 trunking or switchport term to its most accurate description.
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 port: Carries traffic for multiple VLANs using tagging
These terms define how switchports handle VLAN traffic in trunking environments.
Key principle: A trunk port carries traffic for multiple VLANs simultaneously by tagging frames with 802.1Q VLAN identifiers to maintain VLAN separation across 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.
- ✓
Trunk port: Carries traffic for multiple VLANs using tagging
Why this is correct
A trunk port is configured to carry traffic for multiple VLANs, typically using 802.1Q tagging to identify VLAN membership.
Related concept
A trunk port carries traffic for multiple VLANs simultaneously by tagging frames with 802.1Q VLAN identifiers to maintain VLAN separation across switches.
- ✓
Access port: Carries traffic for a single VLAN
Why this is correct
An access port belongs to a single VLAN and does not tag frames; it is used for end-device connections, not for carrying multiple VLANs.
Related concept
A trunk port carries traffic for multiple VLANs simultaneously by tagging frames with 802.1Q VLAN identifiers to maintain VLAN separation across switches.
- ✓
Native VLAN: Untagged traffic on a trunk port
Why this is correct
802.1Q is the IEEE standard for VLAN tagging, not a type of switchport. It defines how VLAN information is inserted into Ethernet frames on trunk links.
Related concept
A trunk port carries traffic for multiple VLANs simultaneously by tagging frames with 802.1Q VLAN identifiers to maintain VLAN separation across switches.
- ✓
VLAN tagging: Adding 802.1Q header to identify VLAN membership
Why this is correct
The native VLAN is the VLAN that carries untagged traffic on a trunk port. It is not a port type but a VLAN assigned to a trunk for untagged frames.
Related concept
A trunk port carries traffic for multiple VLANs simultaneously by tagging frames with 802.1Q VLAN identifiers to maintain VLAN separation across switches.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Candidates often confuse terms like 'access port' and 'trunk port' or mistake protocols (802.1Q) and properties (native VLAN) for port types. Focus on the function: trunk ports carry multiple VLANs; access ports carry one; 802.1Q is the tagging method; native VLAN is the untagged VLAN on a trunk.
Detailed technical explanation
How to think about this question
Trunking is a fundamental concept in VLAN implementation that allows multiple VLANs to share a single physical link between switches. This is achieved by tagging Ethernet frames with VLAN identifiers using the IEEE 802.1Q standard. The trunk port carries traffic for all VLANs allowed on the link, preserving VLAN separation across the network. In contrast, an access port is assigned to a single VLAN and forwards untagged frames to connected end devices, which do not understand VLAN tags. The native VLAN is a special VLAN on 802.1Q trunks that carries untagged traffic. Frames belonging to the native VLAN are sent without VLAN tags, which helps maintain backward compatibility with devices that do not support VLAN tagging. However, the native VLAN must be configured identically on both ends of the trunk link to prevent VLAN mismatches that can cause traffic to be misrouted or dropped. The allowed VLAN list further controls which VLANs are permitted to traverse a trunk, enabling network administrators to limit broadcast domains and improve security by blocking unnecessary VLAN traffic. A common exam trap involves confusing the native VLAN with the access VLAN or misunderstanding the role of VLAN tagging on access ports. For example, assuming that access ports tag frames or that the native VLAN carries tagged traffic can lead to incorrect configurations and connectivity issues. Additionally, leaving the native VLAN as the default VLAN 1 can expose the network to VLAN hopping attacks. Practically, network engineers often change the native VLAN to an unused VLAN and carefully manage allowed VLAN lists to maintain secure and efficient VLAN trunking environments.
KKey Concepts to Remember
- A trunk port carries traffic for multiple VLANs simultaneously by tagging frames with 802.1Q VLAN identifiers to maintain VLAN separation across switches.
- An access port forwards traffic for a single VLAN and does not tag frames, making it suitable for connecting end devices like PCs or printers.
- The native VLAN on an 802.1Q trunk port carries untagged frames and must be consistent on both ends to avoid VLAN mismatches and security risks.
- The allowed VLAN list on a trunk port restricts which VLANs can traverse the trunk link, enhancing security and reducing unnecessary traffic.
- Switches use trunking to extend VLANs across multiple devices, enabling devices in the same VLAN but on different switches to communicate.
- Misconfiguring native VLANs or allowed VLAN lists can cause VLAN hopping, traffic leaks, or connectivity issues between VLANs.
- Cisco switches default the native VLAN to VLAN 1, but best practice is to change it to an unused VLAN to improve security.
- Access ports do not tag frames, so any VLAN tagging configuration on an access port is ignored or causes errors.
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 802.1Q VLAN identifiers to maintain VLAN separation across 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 a trunk port carries traffic for multiple VLANs simultaneously by tagging frames with 802.1Q VLAN identifiers to maintain VLAN separation across switches., then practise related 200-301 questions on the same topic to reinforce the concept.
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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 802.1Q VLAN identifiers to maintain VLAN separation across switches..
What is the correct answer to this question?
The correct answer is: Trunk port: Carries traffic for multiple VLANs using tagging — These terms define how switchports handle VLAN traffic in trunking environments.
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 802.1Q VLAN identifiers to maintain VLAN separation across switches., 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 802.1Q VLAN identifiers to maintain VLAN separation across switches.
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Last reviewed: May 17, 2026
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