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. A key principle to apply: a trunk port carries traffic for multiple VLANs by tagging frames with IEEE 802.1Q tags to distinguish VLAN membership.. 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 switchport on one side of a link is configured as a trunk, but the peer side is configured as an access port. What is the most likely result?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The link roles are mismatched, so VLAN traffic will not be handled as intended.
The most likely result is a logical mismatch that prevents VLAN traffic from crossing the link as intended. In practical terms, one side is trying to carry multiple VLANs with tagging behavior, while the other side is treating the connection as a normal one-VLAN endpoint port. That disagreement usually leads to unexpected or failed traffic behavior.
This is a classic switching mismatch scenario. The link may still be physically up, but the two sides do not agree on how the traffic should be handled.
Key principle: A trunk port carries traffic for multiple VLANs by tagging frames with IEEE 802.1Q tags to distinguish VLAN membership.
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 link roles are mismatched, so VLAN traffic will not be handled as intended.
Why this is correct
This is correct because trunk/access disagreement creates a logical mismatch.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
A trunk port carries traffic for multiple VLANs by tagging frames with IEEE 802.1Q tags to distinguish VLAN membership.
✗
The access side automatically becomes a routed port.
Why it's wrong here
This is wrong because a trunk/access mismatch does not convert the port into Layer 3 mode.
When this WOULD be correct
In a different question scenario where a switchport is explicitly configured to operate as a routed port and is connected to another switchport configured as an access port, the access port could be described as behaving like a routed port due to its Layer 3 capabilities being utilized.
✗
Both switches automatically synchronize their switchport settings.
Why it's wrong here
This is wrong because switchport configuration is not automatically synchronized that way.
When this WOULD be correct
In a different question scenario where both switches are designed to support automatic configuration protocols like Cisco's Dynamic Trunking Protocol (DTP), a question could ask what happens when one switch is set to negotiate trunking while the other is set to access mode. In this case, synchronization could occur if both sides were configured to use DTP.
✗
The mismatch forces OSPF to change router IDs.
Why it's wrong here
This is wrong because OSPF router-ID behavior is unrelated to a Layer 2 switchport mismatch.
When this WOULD be correct
If the question were about OSPF behavior in a scenario where a router's interfaces are misconfigured, such as having a mismatched network type or area configuration, then a change in router IDs could occur due to OSPF recalculating its topology. In that case, the option would be correct.
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 link roles are mismatched, so VLAN traffic will not be handled as intended.Correct answer▾
Why this is correct
This is correct because trunk/access disagreement creates a logical mismatch.
✗The access side automatically becomes a routed port.Wrong answer — click to see why▾
Why this is wrong here
This option is incorrect because an access port does not automatically convert to a routed port when connected to a trunk port; it remains an access port and will not participate in Layer 3 routing.
★ When this WOULD be the correct answer
In a different question scenario where a switchport is explicitly configured to operate as a routed port and is connected to another switchport configured as an access port, the access port could be described as behaving like a routed port due to its Layer 3 capabilities being utilized.
Why candidates choose this
Candidates may find this option tempting because they might confuse the concepts of access ports and routed ports, leading them to believe that any misconfiguration would trigger an automatic change in port type.
✗Both switches automatically synchronize their switchport settings.Wrong answer — click to see why▾
Why this is wrong here
This option is wrong because switchport settings do not automatically synchronize between devices; each port retains its configuration independently, leading to a mismatch in link roles.
★ When this WOULD be the correct answer
In a different question scenario where both switches are designed to support automatic configuration protocols like Cisco's Dynamic Trunking Protocol (DTP), a question could ask what happens when one switch is set to negotiate trunking while the other is set to access mode. In this case, synchronization could occur if both sides were configured to use DTP.
Why candidates choose this
Candidates may find this option tempting because they might recall concepts related to automatic negotiation protocols, leading them to assume that switch configurations can synchronize without manual intervention.
✗The mismatch forces OSPF to change router IDs.Wrong answer — click to see why▾
Why this is wrong here
This option is incorrect because the configuration mismatch between a trunk and an access port does not directly affect OSPF router IDs, which are determined by the OSPF process itself and not by switchport configurations.
★ When this WOULD be the correct answer
If the question were about OSPF behavior in a scenario where a router's interfaces are misconfigured, such as having a mismatched network type or area configuration, then a change in router IDs could occur due to OSPF recalculating its topology. In that case, the option would be correct.
Why candidates choose this
Candidates may choose this option due to a misunderstanding of how OSPF operates and the assumption that any configuration mismatch would lead to OSPF changes, reflecting a common misconception about routing protocols and their dependencies on interface settings.
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
Don't assume mismatches always result in physical link failure; focus on logical traffic handling issues.
Detailed technical explanation
How to think about this question
In Cisco switching environments, a trunk port is designed to carry traffic for multiple VLANs by tagging frames with IEEE 802.1Q tags. This tagging allows switches to differentiate between VLANs across a single physical link. Conversely, an access port is configured to carry traffic for a single VLAN and does not tag frames. When one side of a link is set as a trunk and the other as an access port, the two ends have fundamentally different expectations about frame tagging and VLAN handling.
The decision process in Cisco switches for trunk and access ports is strict: a trunk port expects to receive and send tagged frames for multiple VLANs, while an access port expects untagged frames belonging to a single VLAN. This mismatch causes a logical disagreement where the trunk side tags frames but the access side strips or ignores tags, leading to VLAN traffic not being properly forwarded or recognized. The link may remain physically up, but VLAN separation and traffic forwarding fail, causing connectivity issues.
This scenario is a common exam trap because the physical link status may appear operational, misleading candidates to think the configuration is correct. However, the logical mismatch prevents proper VLAN communication. In practical networks, this mismatch can cause intermittent connectivity or VLAN leakage issues. Understanding this behavior helps network engineers troubleshoot VLAN problems and ensures consistent switchport configuration across links to maintain VLAN integrity.
KKey Concepts to Remember
A trunk port carries traffic for multiple VLANs by tagging frames with IEEE 802.1Q tags to distinguish VLAN membership.
An access port carries traffic for a single VLAN and sends untagged frames without VLAN tags.
A trunk/access mismatch causes a logical disagreement where VLAN tagging expectations differ, preventing proper VLAN traffic forwarding.
Switchports configured as trunks expect tagged frames, while access ports expect untagged frames, leading to traffic handling conflicts if mismatched.
The physical link may remain up during a trunk/access mismatch, but VLAN traffic will not be handled as intended.
Cisco switches do not automatically synchronize switchport modes between connected devices, requiring manual configuration consistency.
OSPF router IDs and Layer 3 routing behavior are unrelated to Layer 2 switchport trunk/access configuration mismatches.
A trunk/access mismatch does not convert a switchport into a routed port; it remains a Layer 2 interface with conflicting VLAN 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 trunk port carries traffic for multiple VLANs by tagging frames with IEEE 802.1Q tags to distinguish VLAN membership.
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.
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 trunk port carries traffic for multiple VLANs by tagging frames with IEEE 802.1Q tags to distinguish VLAN membership., 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 trunk port carries traffic for multiple VLANs by tagging frames with IEEE 802.1Q tags to distinguish VLAN membership..
What is the correct answer to this question?
The correct answer is: The link roles are mismatched, so VLAN traffic will not be handled as intended. — The most likely result is a logical mismatch that prevents VLAN traffic from crossing the link as intended. In practical terms, one side is trying to carry multiple VLANs with tagging behavior, while the other side is treating the connection as a normal one-VLAN endpoint port. That disagreement usually leads to unexpected or failed traffic behavior.
This is a classic switching mismatch scenario. The link may still be physically up, but the two sides do not agree on how the traffic should be handled.
What should I do if I get this 200-301 question wrong?
Review a trunk port carries traffic for multiple VLANs by tagging frames with IEEE 802.1Q tags to distinguish VLAN membership., 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: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
A trunk port carries traffic for multiple VLANs by tagging frames with IEEE 802.1Q tags to distinguish VLAN membership.
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