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: etherChannel aggregates multiple physical Ethernet links into a single logical link to increase bandwidth and provide redundancy.. 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.
An EtherChannel uses LACP. One side is configured correctly, but the peer side has a different switchport mode on one of the member links. 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 bundle may fail to form correctly because the member-link settings are inconsistent.
The most likely result is that the bundle will not form cleanly because EtherChannel requires member links to agree on important operational settings. In practical terms, LACP negotiation alone is not enough. The links also need compatible characteristics such as switchport mode, VLAN handling, speed, and duplex where relevant.
This is a common troubleshooting pattern. It tests whether you know that bundle membership depends on configuration consistency, not just on enabling LACP.
Key principle: EtherChannel aggregates multiple physical Ethernet links into a single logical link to increase bandwidth and provide redundancy.
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 bundle may fail to form correctly because the member-link settings are inconsistent.
Why this is correct
This is correct because EtherChannel depends on compatible member settings.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
EtherChannel aggregates multiple physical Ethernet links into a single logical link to increase bandwidth and provide redundancy.
✗
The switch automatically rewrites the peer configuration to match.
Why it's wrong here
This is wrong because the switch does not self-correct the peer in that way.
When this WOULD be correct
In a different scenario where a question asks about a switch with a feature that automatically synchronizes configurations between peers, option B could be correct. For instance, if the question described a proprietary protocol that allows automatic configuration adjustments, then this option would apply.
✗
LACP converts the mismatched link into a routed interface automatically.
Why it's wrong here
This is wrong because LACP does not create routed ports automatically.
When this WOULD be correct
In a different scenario where a question states that a switch is configured to automatically convert interfaces based on specific conditions, such as mismatched configurations, then this option could be correct. For instance, if the question involves a switch model that supports automatic interface type adjustments under certain circumstances.
✗
The mismatched link is placed in a spanning-tree blocking state.
Why it's wrong here
This is wrong because EtherChannel mismatch does not cause VLAN root election in that way.
When this WOULD be correct
In a different scenario where the question asks about the impact of VLAN configurations on spanning tree protocol (STP) operations, this option could be correct if it stated that a VLAN mismatch could affect the root bridge election process. For example, if the question involved VLAN configurations and STP, option D could be valid.
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 bundle may fail to form correctly because the member-link settings are inconsistent.Correct answer▾
Why this is correct
This is correct because EtherChannel depends on compatible member settings.
✗The switch automatically rewrites the peer configuration to match.Wrong answer — click to see why▾
Why this is wrong here
Switches do not automatically rewrite peer configurations; configuration changes must be made manually or via network automation tools. LACP only negotiates parameters like speed and duplex, not switchport mode or VLAN settings.
★ When this WOULD be the correct answer
In a different scenario where a question asks about a switch with a feature that automatically synchronizes configurations between peers, option B could be correct. For instance, if the question described a proprietary protocol that allows automatic configuration adjustments, then this option would apply.
Why candidates choose this
Students might think that LACP's negotiation capabilities extend to automatically correcting misconfigurations, but LACP only ensures consistent operational parameters on both ends, not switchport mode or VLAN membership.
✗LACP converts the mismatched link into a routed interface automatically.Wrong answer — click to see why▾
Why this is wrong here
LACP operates at Layer 2 and does not change the interface type; a mismatched link remains a Layer 2 interface. Converting to a routed interface requires manual configuration with 'no switchport' command.
★ When this WOULD be the correct answer
In a different scenario where a question states that a switch is configured to automatically convert interfaces based on specific conditions, such as mismatched configurations, then this option could be correct. For instance, if the question involves a switch model that supports automatic interface type adjustments under certain circumstances.
Why candidates choose this
The term 'LACP' might be confused with 'routed port' or 'Layer 3' functionality, but LACP is purely for link aggregation and does not alter the interface's Layer 2 or Layer 3 status.
✗The mismatched link is placed in a spanning-tree blocking state.Wrong answer — click to see why▾
Why this is wrong here
This is incorrect because a switchport mode mismatch in an EtherChannel typically causes the link to be suspended or placed into an errdisable state, not into a spanning-tree blocking state. Spanning tree deals with loops, not port-channel parameter mismatches.
★ When this WOULD be the correct answer
In a different scenario where the question asks about the impact of VLAN configurations on spanning tree protocol (STP) operations, this option could be correct if it stated that a VLAN mismatch could affect the root bridge election process. For example, if the question involved VLAN configurations and STP, option D could be valid.
Why candidates choose this
Students may associate VLANs and STP with EtherChannel because both involve multiple links, but the root bridge election is unrelated to EtherChannel member link consistency.
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 assume LACP can resolve all configuration mismatches. Ensure all settings are consistent across member links.
Detailed technical explanation
How to think about this question
EtherChannel is a technology that aggregates multiple physical Ethernet links into a single logical link to increase bandwidth and provide redundancy. Link Aggregation Control Protocol (LACP) is a dynamic protocol used to negotiate and maintain EtherChannel bundles between switches. For EtherChannel to function correctly, all member links must have consistent configurations, including switchport mode, VLAN membership, speed, duplex, and trunking settings. LACP helps identify compatible links but does not override configuration mismatches.
When one side of an EtherChannel is configured correctly with LACP but the peer side has a different switchport mode on one member link, the bundle formation fails or is incomplete. This is because EtherChannel requires all member links to have matching operational parameters to bundle them successfully. LACP packets are exchanged to verify compatibility, but if the switchport modes differ (for example, one side is access and the other is trunk), the protocol will not aggregate that link, causing the bundle to be partial or fail.
A common exam trap is assuming that LACP automatically corrects or rewrites the peer’s configuration or that mismatched links convert to routed interfaces. In reality, LACP only negotiates link aggregation parameters and does not modify switchport modes or VLAN settings. Misconfigured member links cause EtherChannel to fail silently or partially, leading to inconsistent forwarding behavior and potential network issues. Understanding this helps troubleshoot EtherChannel problems and ensures consistent configuration across all member links.
KKey Concepts to Remember
EtherChannel aggregates multiple physical Ethernet links into a single logical link to increase bandwidth and provide redundancy.
LACP dynamically negotiates and maintains EtherChannel bundles but requires consistent member link configurations to form correctly.
All member links in an EtherChannel must have matching switchport modes, VLAN settings, speed, and duplex for successful bundle formation.
LACP does not automatically correct or rewrite mismatched switchport modes on the peer side of an EtherChannel.
If member link configurations differ, the EtherChannel bundle may fail to form or form partially, causing inconsistent network behavior.
Switchport mode mismatches between EtherChannel peers prevent proper LACP negotiation and link aggregation.
EtherChannel failure due to configuration mismatch does not trigger VLAN root bridge election or convert links to routed interfaces.
Troubleshooting EtherChannel requires verifying that all member links have identical operational parameters on both ends.
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
EtherChannel aggregates multiple physical Ethernet links into a single logical link to increase bandwidth and provide redundancy.
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 etherChannel aggregates multiple physical Ethernet links into a single logical link to increase bandwidth and provide redundancy., 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 — EtherChannel aggregates multiple physical Ethernet links into a single logical link to increase bandwidth and provide redundancy..
What is the correct answer to this question?
The correct answer is: The bundle may fail to form correctly because the member-link settings are inconsistent. — The most likely result is that the bundle will not form cleanly because EtherChannel requires member links to agree on important operational settings. In practical terms, LACP negotiation alone is not enough. The links also need compatible characteristics such as switchport mode, VLAN handling, speed, and duplex where relevant.
This is a common troubleshooting pattern. It tests whether you know that bundle membership depends on configuration consistency, not just on enabling LACP.
What should I do if I get this 200-301 question wrong?
Review etherChannel aggregates multiple physical Ethernet links into a single logical link to increase bandwidth and provide redundancy., 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?
EtherChannel aggregates multiple physical Ethernet links into a single logical link to increase bandwidth and provide redundancy.
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