CCNA Switching and Network Access Practice Question
This 200-301 practice question tests your understanding of switching and network access. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. A key principle to apply: 802.1Q trunking tags Ethernet frames to carry multiple VLANs over a single physical link on Cisco 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.
A switch shows this output from the "show interfaces trunk" command:
Gi0/1 on 802.1q trunking 1
Gi0/2 auto 802.1q not-trunking 1
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Gi0/1 is trunking, and Gi0/2 is waiting for DTP negotiation
Gi0/1 is already operating as an 802.1Q trunk. Gi0/2 is in dynamic auto mode, which waits for the other side to actively negotiate trunking.
Key principle: 802.1Q trunking tags Ethernet frames to carry multiple VLANs over a single physical link on Cisco 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.
✗
Gi0/1 is an access port in VLAN 1
Why it's wrong here
The output explicitly shows Gi0/1 trunking, not access mode.
When this WOULD be correct
In a different scenario where the question specifies that Gi0/1 is configured as an access port and VLAN 1 is the only VLAN present, this option would be correct. The question could state that the switch is set to default configurations without any trunking enabled.
✓
Gi0/1 is trunking, and Gi0/2 is waiting for DTP negotiation
Why this is correct
Correct. Gi0/1 is trunking now; Gi0/2 is in a passive DTP negotiation state.
Related concept
802.1Q trunking tags Ethernet frames to carry multiple VLANs over a single physical link on Cisco switches.
✗
Gi0/2 is forced to trunk mode
Why it's wrong here
Dynamic auto does not force trunking by itself.
When this WOULD be correct
In a different scenario where the question specifies that Gi0/2 is explicitly configured with the 'switchport mode trunk' command, this option would be correct as it would indicate that Gi0/2 is indeed forced into trunk mode regardless of DTP negotiation.
✗
Neither interface can carry tagged traffic
Why it's wrong here
A working 802.1Q trunk absolutely can carry tagged traffic.
When this WOULD be correct
If the question were to state that both interfaces are configured as access ports and there is no mention of trunking or DTP negotiation, then option D would be correct, as neither interface would be able to carry tagged traffic in that scenario.
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.
✓Gi0/1 is trunking, and Gi0/2 is waiting for DTP negotiationCorrect answer▾
Why this is correct
Correct. Gi0/1 is trunking now; Gi0/2 is in a passive DTP negotiation state.
✗Gi0/1 is an access port in VLAN 1Wrong answer — click to see why▾
Why this is wrong here
This option is incorrect because Gi0/1 is configured as a trunk port, not an access port, and it is actively trunking VLANs. Access ports do not participate in VLAN tagging and would not show trunking status.
★ When this WOULD be the correct answer
In a different scenario where the question specifies that Gi0/1 is configured as an access port and VLAN 1 is the only VLAN present, this option would be correct. The question could state that the switch is set to default configurations without any trunking enabled.
Why candidates choose this
Candidates may choose this option due to a misunderstanding of port roles; they might confuse trunk ports with access ports, especially if they recall that VLAN 1 is often the default VLAN for access ports.
✗Gi0/2 is forced to trunk modeWrong answer — click to see why▾
Why this is wrong here
This option is incorrect because Gi0/2 is set to 'auto' for trunking, meaning it is not forced into trunk mode but is instead waiting for Dynamic Trunking Protocol (DTP) negotiation to determine if it should become a trunk port.
★ When this WOULD be the correct answer
In a different scenario where the question specifies that Gi0/2 is explicitly configured with the 'switchport mode trunk' command, this option would be correct as it would indicate that Gi0/2 is indeed forced into trunk mode regardless of DTP negotiation.
Why candidates choose this
Candidates may find this option tempting because they might misinterpret the 'auto' setting as an indication that the port is actively configured to trunk, leading them to assume it is forced into that mode.
✗Neither interface can carry tagged trafficWrong answer — click to see why▾
Why this is wrong here
This option is incorrect because Gi0/1 is configured as a trunk port and can carry tagged traffic, while Gi0/2 is in a state waiting for DTP negotiation, which means it can potentially become a trunk port as well.
★ When this WOULD be the correct answer
If the question were to state that both interfaces are configured as access ports and there is no mention of trunking or DTP negotiation, then option D would be correct, as neither interface would be able to carry tagged traffic in that scenario.
Why candidates choose this
Candidates may choose this option due to a misunderstanding of trunking and access port configurations, leading them to incorrectly assume that if an interface is not explicitly set to trunk, it cannot carry tagged traffic.
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
Beware of confusing 'on' with access mode and misunderstanding dynamic auto's capability to negotiate trunking.
Trap categories for this question
Command / output trap
The output explicitly shows Gi0/1 trunking, not access mode.
Detailed technical explanation
How to think about this question
802.1Q trunking is a VLAN tagging protocol used on Cisco switches to carry multiple VLANs over a single physical link. A trunk port tags Ethernet frames with VLAN identifiers, allowing traffic from multiple VLANs to traverse the same interface. Cisco switches use Dynamic Trunking Protocol (DTP) to negotiate trunk links automatically, with interface modes such as trunk, access, dynamic desirable, and dynamic auto determining how the port behaves in trunk negotiation.
In the given output, Gi0/1 is explicitly trunking using 802.1Q, meaning it is actively tagging frames for VLAN 1 and potentially other VLANs. Gi0/2 is in dynamic auto mode, which means it passively waits for the other side to initiate trunk negotiation. If the other side does not actively request trunking, Gi0/2 remains an access port. This behavior is fundamental to understanding how Cisco switches establish trunk links dynamically.
The exam trap here is confusing dynamic auto mode with forced trunking. Dynamic auto ports do not actively negotiate trunking; they wait for the peer to initiate. This can cause a link to remain in access mode if the other side is also passive or set to access. Understanding this subtlety helps avoid misinterpreting interface states and ensures correct VLAN traffic flow in practical networks and exam scenarios.
KKey Concepts to Remember
802.1Q trunking tags Ethernet frames to carry multiple VLANs over a single physical link on Cisco switches.
Dynamic Trunking Protocol (DTP) negotiates trunk links automatically using interface modes like trunk, access, dynamic desirable, and dynamic auto.
A port in dynamic auto mode passively waits for the other side to initiate trunk negotiation before becoming a trunk port.
A port in trunk mode actively tags frames and carries traffic for multiple VLANs without waiting for negotiation.
If both ends of a link are set to dynamic auto or access, the link remains an access port and does not trunk.
Dynamic desirable mode actively attempts to form a trunk by sending DTP negotiation frames to the peer.
Understanding interface modes and their negotiation behavior is essential to correctly interpret switch port states and VLAN traffic flow.
Misinterpreting dynamic auto as forced trunking is a common exam mistake that leads to incorrect conclusions about port states.
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
802.1Q trunking tags Ethernet frames to carry multiple VLANs over a single physical link on Cisco 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.
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 802.1Q trunking tags Ethernet frames to carry multiple VLANs over a single physical link on Cisco switches., 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 — 802.1Q trunking tags Ethernet frames to carry multiple VLANs over a single physical link on Cisco switches..
What is the correct answer to this question?
The correct answer is: Gi0/1 is trunking, and Gi0/2 is waiting for DTP negotiation — Gi0/1 is already operating as an 802.1Q trunk. Gi0/2 is in dynamic auto mode, which waits for the other side to actively negotiate trunking.
What should I do if I get this 200-301 question wrong?
Review 802.1Q trunking tags Ethernet frames to carry multiple VLANs over a single physical link on Cisco switches., then practise related 200-301 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
802.1Q trunking tags Ethernet frames to carry multiple VLANs over a single physical link on Cisco switches.
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