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 bundles multiple physical interfaces into a single logical link to increase bandwidth and provide redundancy between 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.
An EtherChannel between two switches is configured for LACP. One switch shows the member interfaces as bundled, while the other shows them as individual interfaces. Which explanation is most likely if both sides are using LACP?
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 member interface settings do not match closely enough for bundling, even though both sides use LACP.
The most likely explanation is that some other interface settings do not match, even though both sides are using the same EtherChannel protocol. In practical terms, LACP alone is not enough. The candidate member interfaces also need to agree on characteristics such as speed, duplex, switchport mode, allowed VLANs where relevant, and other channel-related settings. If they do not, one side may treat the links as separate instead of bundling them.
This is a common troubleshooting pattern because it tests whether you know that EtherChannel success depends on more than just the negotiation protocol name.
Key principle: EtherChannel bundles multiple physical interfaces into a single logical link to increase bandwidth and provide redundancy between 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.
✓
The member interface settings do not match closely enough for bundling, even though both sides use LACP.
Why this is correct
This is correct because EtherChannel depends on compatible member settings as well as the protocol.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
EtherChannel bundles multiple physical interfaces into a single logical link to increase bandwidth and provide redundancy between switches.
✗
LACP always requires one side to use PAgP as a backup.
Why it's wrong here
This is wrong because LACP and PAgP are different negotiation protocols.
When this WOULD be correct
In a different scenario, a question might state that a switch is configured to use LACP but has a fallback mechanism that defaults to PAgP if LACP fails. In this case, the option would be correct as it describes a situation where LACP requires PAgP as a backup protocol.
✗
EtherChannel cannot operate on switch trunks.
Why it's wrong here
This is wrong because EtherChannel commonly operates on trunk links.
When this WOULD be correct
If a question asked about the limitations of EtherChannel configurations specifically in relation to VLANs and trunking, stating that EtherChannel cannot operate on switch trunks would be correct. For example, if the question specified that both switches were configured as access ports only, this option could be valid.
✗
One switch must disable STP before EtherChannel can form.
Why it's wrong here
This is wrong because disabling STP is not a requirement for EtherChannel formation.
When this WOULD be correct
In a different scenario where the question specifies that a network design mandates disabling STP to prevent loops in a specific topology, and the exam asks about prerequisites for EtherChannel formation under those conditions, this option could 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 member interface settings do not match closely enough for bundling, even though both sides use LACP.Correct answer▾
Why this is correct
This is correct because EtherChannel depends on compatible member settings as well as the protocol.
✗LACP always requires one side to use PAgP as a backup.Wrong answer — click to see why▾
Why this is wrong here
This option is incorrect because LACP (Link Aggregation Control Protocol) does not require PAgP (Port Aggregation Protocol) as a backup; they are separate protocols. LACP can operate independently without needing PAgP on either side of the EtherChannel.
★ When this WOULD be the correct answer
In a different scenario, a question might state that a switch is configured to use LACP but has a fallback mechanism that defaults to PAgP if LACP fails. In this case, the option would be correct as it describes a situation where LACP requires PAgP as a backup protocol.
Why candidates choose this
Candidates may find this option tempting because they might confuse LACP with PAgP, thinking that both protocols can work together or that one is required as a fallback for the other, leading to misconceptions about their operational requirements.
✗EtherChannel cannot operate on switch trunks.Wrong answer — click to see why▾
Why this is wrong here
This option is incorrect because EtherChannel can indeed operate on switch trunks, allowing multiple VLANs to be carried over a single logical link. The issue in the question pertains to LACP configuration mismatches, not trunking capabilities.
★ When this WOULD be the correct answer
If a question asked about the limitations of EtherChannel configurations specifically in relation to VLANs and trunking, stating that EtherChannel cannot operate on switch trunks would be correct. For example, if the question specified that both switches were configured as access ports only, this option could be valid.
Why candidates choose this
Candidates may choose this option due to a common misconception that EtherChannel configurations are incompatible with trunking, leading to confusion about the requirements for successful EtherChannel setups.
✗One switch must disable STP before EtherChannel can form.Wrong answer — click to see why▾
Why this is wrong here
This option is incorrect because Spanning Tree Protocol (STP) does not need to be disabled for EtherChannel to form; EtherChannel can operate alongside STP. Disabling STP can lead to network loops and is not a requirement for EtherChannel functionality.
★ When this WOULD be the correct answer
In a different scenario where the question specifies that a network design mandates disabling STP to prevent loops in a specific topology, and the exam asks about prerequisites for EtherChannel formation under those conditions, this option could be correct.
Why candidates choose this
Candidates might choose this option due to a common misconception that STP must be disabled to allow for EtherChannel, especially if they have encountered configurations where STP issues caused problems in bundled interfaces.
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 LACP alone ensures bundling; check all interface settings for consistency.
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. Cisco supports two main negotiation protocols for EtherChannel: PAgP (Cisco proprietary) and LACP (IEEE standard). LACP dynamically negotiates the formation of the EtherChannel by exchanging LACP Data Units (LACPDUs) between switches to identify compatible interfaces. However, successful bundling depends not only on using the same protocol but also on matching interface characteristics such as speed, duplex mode, VLAN membership, and trunking configuration.
When configuring EtherChannel with LACP, both sides must have member interfaces with identical settings. If any parameter differs, such as one side having a different speed or trunk allowed VLAN list, the EtherChannel will not bundle properly. This mismatch causes one switch to show the interfaces as bundled (aggregated), while the other switch treats them as individual interfaces. This behavior occurs because LACP negotiation succeeds in identifying the protocol but fails the consistency checks required for bundling.
A common exam trap is assuming that using LACP on both sides guarantees EtherChannel formation regardless of interface settings. In reality, LACP only negotiates the protocol presence; it does not override mismatched interface parameters. Practically, this means network engineers must verify all relevant interface configurations to ensure compatibility. EtherChannel links continue to participate in STP normally, and disabling STP is neither required nor recommended. Understanding this nuance is critical for CCNA candidates troubleshooting EtherChannel issues in Cisco environments.
KKey Concepts to Remember
EtherChannel bundles multiple physical interfaces into a single logical link to increase bandwidth and provide redundancy between switches.
LACP (Link Aggregation Control Protocol) negotiates EtherChannel formation by exchanging protocol data units to identify compatible member interfaces.
Member interfaces must match in speed, duplex, VLAN membership, trunking mode, and other settings for EtherChannel to bundle them successfully.
If member interface settings differ, one side may bundle interfaces while the other treats them as individual links despite using LACP.
EtherChannel protocols like LACP require both negotiation compatibility and consistent interface configurations to form a stable channel.
Switches do not require disabling STP to form EtherChannel; STP runs normally over the logical aggregated link.
EtherChannel supports both access and trunk ports, allowing aggregated links to carry VLAN traffic when configured as trunks.
Troubleshooting EtherChannel issues often involves verifying matching interface parameters beyond just the negotiation protocol.
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 bundles multiple physical interfaces into a single logical link to increase bandwidth and provide redundancy between 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 etherChannel bundles multiple physical interfaces into a single logical link to increase bandwidth and provide redundancy between 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 — EtherChannel bundles multiple physical interfaces into a single logical link to increase bandwidth and provide redundancy between switches..
What is the correct answer to this question?
The correct answer is: The member interface settings do not match closely enough for bundling, even though both sides use LACP. — The most likely explanation is that some other interface settings do not match, even though both sides are using the same EtherChannel protocol. In practical terms, LACP alone is not enough. The candidate member interfaces also need to agree on characteristics such as speed, duplex, switchport mode, allowed VLANs where relevant, and other channel-related settings. If they do not, one side may treat the links as separate instead of bundling them.
This is a common troubleshooting pattern because it tests whether you know that EtherChannel success depends on more than just the negotiation protocol name.
What should I do if I get this 200-301 question wrong?
Review etherChannel bundles multiple physical interfaces into a single logical link to increase bandwidth and provide redundancy between switches., 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 bundles multiple physical interfaces into a single logical link to increase bandwidth and provide redundancy between switches.
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