The best explanation is that the port role is wrong because a normal PC-facing switchport should usually be an access port, not a trunk. A PC connected to a trunk port cannot communicate because standard network interface cards send and expect untagged frames, while a trunk port expects frames to carry a VLAN tag (typically 802.1Q). Since the PC cannot insert or interpret these tags, the switch drops the untagged traffic or misinterprets it, breaking connectivity. On the CCNA 200-301 v2 exam, this question tests your understanding of switchport modes and the fundamental difference between access and trunk roles—a common trap is assuming trunk mode simply “works” for any device. Remember the memory tip: “Access for endpoints, trunk for inter-switch links.” This distinction is critical because trunk ports are designed for links between switches or routers, not for hosts.
CCNA Switching and Network Access Practice Question
This 200-301 practice question tests your understanding of switching and network access. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. A key principle to apply: a switch port connected to a user PC is typically configured as an access port to carry traffic for a single VLAN without tagging frames.. 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.
A switch port connected to a user PC is configured as a trunk. The PC cannot communicate normally. What is the best explanation?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The port role is wrong because a normal PC-facing switchport should usually be an access port, not a trunk
The best explanation is that the port role is wrong: a PC-facing port should be an access port, not a trunk, because PCs normally send untagged frames and cannot process VLAN tags. Option B is incorrect because EtherChannel is used for link aggregation, not required for a single PC. Option C is wrong because trunk mode does not disable MAC address learning. Option D is irrelevant, as switches do not stop using IP addressing in trunk mode.
Key principle: A switch port connected to a user PC is typically configured as an access port to carry traffic for a single VLAN without tagging frames.
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 port role is wrong because a normal PC-facing switchport should usually be an access port, not a trunk
Why this is correct
This is correct because a standard PC is normally connected to an access port in one VLAN.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
A switch port connected to a user PC is typically configured as an access port to carry traffic for a single VLAN without tagging frames.
✗
A user PC requires EtherChannel to function
Why it's wrong here
This is wrong because a normal user PC does not require EtherChannel for ordinary connectivity.
When this WOULD be correct
In a different question scenario where a network engineer is troubleshooting a link aggregation setup, a user PC connected to a switch port configured for EtherChannel might fail to communicate if EtherChannel is misconfigured or not properly negotiated, making this option correct.
✗
Trunk mode disables MAC address learning automatically
Why it's wrong here
This is wrong because trunking does not disable MAC learning by itself.
When this WOULD be correct
In a scenario where a question states that a switch is configured to prevent MAC address learning for security reasons, and a user PC is connected to a trunk port, this option would be correct. The question would need to specify that MAC address learning is intentionally disabled on trunk ports.
✗
Trunk mode forces the switch to stop using IP addressing
Why it's wrong here
This is wrong because trunk mode does not disable IP functions on the switch.
When this WOULD be correct
In a scenario where a question states that a switch is configured to only allow access ports and is explicitly designed to prevent any IP addressing on trunk ports, option D could be correct. For example, if the question specifies that the switch's configuration is intended to isolate VLANs without IP communication, then trunk mode would indeed stop IP addressing.
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.
✓The port role is wrong because a normal PC-facing switchport should usually be an access port, not a trunkCorrect answer▾
Why this is correct
This is correct because a standard PC is normally connected to an access port in one VLAN.
✗A user PC requires EtherChannel to functionWrong answer — click to see why▾
Why this is wrong here
A user PC does not require EtherChannel to function; EtherChannel is a method for bundling multiple physical links into a single logical link, which is not necessary for standard PC connectivity.
★ When this WOULD be the correct answer
In a different question scenario where a network engineer is troubleshooting a link aggregation setup, a user PC connected to a switch port configured for EtherChannel might fail to communicate if EtherChannel is misconfigured or not properly negotiated, making this option correct.
Why candidates choose this
Candidates may choose this option due to a misunderstanding of network configurations, believing that advanced features like EtherChannel are necessary for all devices, especially in complex environments.
✗Trunk mode disables MAC address learning automaticallyWrong answer — click to see why▾
Why this is wrong here
Trunk mode does not disable MAC address learning; it actually allows the switch to learn MAC addresses from multiple VLANs. Therefore, a switch port configured as a trunk can still learn MAC addresses normally.
★ When this WOULD be the correct answer
In a scenario where a question states that a switch is configured to prevent MAC address learning for security reasons, and a user PC is connected to a trunk port, this option would be correct. The question would need to specify that MAC address learning is intentionally disabled on trunk ports.
Why candidates choose this
Candidates may confuse trunk mode with other configurations that limit MAC address learning, leading them to believe that trunking could inherently disable this feature. This misconception can arise from a lack of understanding of how VLANs and trunking work.
✗Trunk mode forces the switch to stop using IP addressingWrong answer — click to see why▾
Why this is wrong here
Trunk mode does not disable IP addressing; it allows multiple VLANs to be carried over a single link, and IP addressing is still applicable to the switch interfaces. Therefore, the user PC's inability to communicate is not due to trunk mode disabling IP addressing.
★ When this WOULD be the correct answer
In a scenario where a question states that a switch is configured to only allow access ports and is explicitly designed to prevent any IP addressing on trunk ports, option D could be correct. For example, if the question specifies that the switch's configuration is intended to isolate VLANs without IP communication, then trunk mode would indeed stop IP addressing.
Why candidates choose this
Candidates may confuse trunk mode with access mode capabilities and mistakenly believe that trunking limits IP addressing, especially if they have encountered scenarios where VLAN configurations affect communication. This misunderstanding can lead them to choose this option when they see 'trunk mode' mentioned.
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
Be careful not to confuse physical link issues with logical configuration mismatches. A trunk port on a user PC is a logical mismatch, not a hardware failure.
Detailed technical explanation
How to think about this question
A switch port configured as a trunk is designed to carry traffic for multiple VLANs by tagging frames with VLAN identifiers using the IEEE 802.1Q standard. This allows switches to segregate traffic logically across the same physical link. However, end-user devices like PCs typically do not understand VLAN tagging and expect to send and receive untagged Ethernet frames. Therefore, the standard practice is to configure switch ports connected to user PCs as access ports, which carry traffic for a single VLAN without tagging frames.
The decision to configure a port as access or trunk depends on the connected device type and network design. Access ports are assigned to a single VLAN and forward untagged frames, making them suitable for user devices. Trunk ports, on the other hand, carry multiple VLANs and tag frames accordingly. When a PC-facing port is mistakenly set as a trunk, the PC receives tagged frames it cannot interpret, causing communication failures. The switch still learns MAC addresses on trunk ports, but the VLAN tagging mismatch prevents normal PC communication.
This scenario is a common exam trap where candidates confuse trunk and access port roles. The trap lies in assuming trunk mode is always beneficial or required, but it is inappropriate for user endpoints. Practically, a trunk port connected to a PC will cause connectivity issues because the PC does not process VLAN tags. Correct network design mandates that edge ports connected to end devices be access ports to ensure proper VLAN membership and seamless communication.
KKey Concepts to Remember
A switch port connected to a user PC is typically configured as an access port to carry traffic for a single VLAN without tagging frames.
Trunk ports are designed to carry traffic for multiple VLANs simultaneously by tagging Ethernet frames with VLAN identifiers using IEEE 802.1Q.
A user PC normally sends and receives untagged Ethernet frames and does not understand VLAN tagging, so it requires an access port configuration.
Configuring a PC-facing port as a trunk causes a mismatch because the PC cannot process tagged frames, leading to communication failures.
Switch ports in trunk mode still learn MAC addresses and forward frames normally but expect VLAN tags, which user PCs do not generate.
EtherChannel is a link aggregation technology that combines multiple physical links into one logical link and is not required for basic PC connectivity.
Trunk mode does not disable IP addressing or MAC address learning on the switch; it only changes how VLAN tags are handled on the port.
Proper VLAN design requires edge ports connected to end devices to be access ports to ensure correct VLAN membership and frame handling.
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 switch port connected to a user PC is typically configured as an access port to carry traffic for a single VLAN without tagging frames.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 200-301 question in full detail.
Review a switch port connected to a user PC is typically configured as an access port to carry traffic for a single VLAN without tagging frames., then practise related 200-301 questions on the same topic to reinforce the concept.
Switching and Network Access — This question tests Switching and Network Access — A switch port connected to a user PC is typically configured as an access port to carry traffic for a single VLAN without tagging frames..
What is the correct answer to this question?
The correct answer is: The port role is wrong because a normal PC-facing switchport should usually be an access port, not a trunk — The best explanation is that the port role is wrong: a PC-facing port should be an access port, not a trunk, because PCs normally send untagged frames and cannot process VLAN tags. Option B is incorrect because EtherChannel is used for link aggregation, not required for a single PC. Option C is wrong because trunk mode does not disable MAC address learning. Option D is irrelevant, as switches do not stop using IP addressing in trunk mode.
What should I do if I get this 200-301 question wrong?
Review a switch port connected to a user PC is typically configured as an access port to carry traffic for a single VLAN without tagging frames., then practise related 200-301 questions on the same topic to reinforce the concept.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
A switch port connected to a user PC is typically configured as an access port to carry traffic for a single VLAN without tagging frames.
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