- A
The member interfaces have mismatched speed or duplex settings
Why wrong: Speed or duplex mismatches can definitely break an EtherChannel, which makes this option tempting. The problem is that the exhibit does not specifically prove that speed or duplex is the issue. It only proves that the links are not bundling correctly. On exam-style questions, choose the conclusion directly supported by the output before jumping to one of several possible hidden causes.
- B
The port channel is Layer 3 instead of Layer 2
Why wrong: A Layer 3 port-channel can work perfectly well when intentionally configured that way, so the phrase 'Layer 3' does not explain the failure on its own. The real problem shown here is that the member interfaces are not joining the logical channel correctly. The status flags point to a bundle formation problem, not simply to the channel being Layer 3 or Layer 2.
- C
At least one member interface is not bundled correctly, so the logical channel is down
Correct. This is correct. The logical EtherChannel is down because the physical members are not properly bundled. The status display is telling you that the switch did not build a working aggregated link, so the port-channel cannot carry traffic as intended.
- D
LACP requires exactly four links to form a bundle
Why wrong: LACP does not require four links. Two-link EtherChannels are extremely common, and LACP can negotiate bundles with fewer than four member interfaces. The issue is not link count. The issue is that the displayed interfaces are not in a healthy bundled state.
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: etherChannel bundles multiple physical interfaces 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.
A network engineer checks EtherChannel status on a switch and sees the following output:
Group Port-channel Protocol Ports ------+-------------+---------+----------------------------- 1 Po1(SD) LACP Gi1/0/1(s) Gi1/0/2(I)
What is the most likely reason the EtherChannel is not forwarding traffic?
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 choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
At least one member interface is not bundled correctly, so the logical channel is down
The safest conclusion from this output is that the member interfaces are not successfully participating in the bundle, so the logical port-channel is down. Cisco exam questions often test whether you can read the status flags without overcommitting to a very specific root cause that the exhibit does not explicitly prove. One member is suspended and another is not bundled into the channel correctly, so the EtherChannel never reaches a healthy forwarding state. In the real world, that can happen because of trunk mismatches, allowed VLAN mismatches, native VLAN problems, inconsistent channel-group settings, or negotiation issues. The key exam skill is recognizing that the bundle itself failed, not guessing one hidden configuration line that is not shown.
Key principle: EtherChannel bundles multiple physical interfaces 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 member interfaces have mismatched speed or duplex settings
Why it's wrong here
Speed or duplex mismatches can definitely break an EtherChannel, which makes this option tempting. The problem is that the exhibit does not specifically prove that speed or duplex is the issue. It only proves that the links are not bundling correctly. On exam-style questions, choose the conclusion directly supported by the output before jumping to one of several possible hidden causes.
When this WOULD be correct
In a different scenario, if a question presented an EtherChannel configuration where the interfaces were explicitly set to different speeds or duplex modes, leading to a negotiation failure, this option would be correct. For example, if the question stated that Gi1/0/1 was set to 100Mbps full duplex and Gi1/0/2 was set to 1Gbps half duplex, it would lead to a mismatch.
- ✗
The port channel is Layer 3 instead of Layer 2
Why it's wrong here
A Layer 3 port-channel can work perfectly well when intentionally configured that way, so the phrase 'Layer 3' does not explain the failure on its own. The real problem shown here is that the member interfaces are not joining the logical channel correctly. The status flags point to a bundle formation problem, not simply to the channel being Layer 3 or Layer 2.
When this WOULD be correct
In a different scenario, if a question specifies that an EtherChannel is configured as Layer 3 and the interfaces are expected to be Layer 2, then selecting this option would be correct. For example, if the question states that the EtherChannel is not forwarding traffic due to incorrect Layer 3 configuration, this option would apply.
- ✓
At least one member interface is not bundled correctly, so the logical channel is down
Why this is correct
Correct. This is correct. The logical EtherChannel is down because the physical members are not properly bundled. The status display is telling you that the switch did not build a working aggregated link, so the port-channel cannot carry traffic as intended.
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.
- ✗
LACP requires exactly four links to form a bundle
Why it's wrong here
LACP does not require four links. Two-link EtherChannels are extremely common, and LACP can negotiate bundles with fewer than four member interfaces. The issue is not link count. The issue is that the displayed interfaces are not in a healthy bundled state.
When this WOULD be correct
In a different question, if it specified that an EtherChannel configuration must have exactly four links to be valid, and the output showed only two links, then this option would be correct. For instance, a question could state that a network engineer is troubleshooting a configuration that mandates four links for LACP to function properly.
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.
✓At least one member interface is not bundled correctly, so the logical channel is downCorrect answer▾
Why this is correct
Correct. This is correct. The logical EtherChannel is down because the physical members are not properly bundled. The status display is telling you that the switch did not build a working aggregated link, so the port-channel cannot carry traffic as intended.
✗The member interfaces have mismatched speed or duplex settingsWrong answer — click to see why▾
Why this is wrong here
The output shows individual port statuses (s) and (I), which indicate LACP negotiation states, not speed/duplex mismatches. While speed/duplex mismatches can cause EtherChannel issues, the specific flags in the exhibit point to a bundling problem, not a mismatch.
★ When this WOULD be the correct answer
In a different scenario, if a question presented an EtherChannel configuration where the interfaces were explicitly set to different speeds or duplex modes, leading to a negotiation failure, this option would be correct. For example, if the question stated that Gi1/0/1 was set to 100Mbps full duplex and Gi1/0/2 was set to 1Gbps half duplex, it would lead to a mismatch.
Why candidates choose this
Students often associate EtherChannel failures with speed/duplex mismatches because that is a common cause in general networking. However, the output here provides direct evidence of LACP negotiation issues, making this option a guess rather than a conclusion supported by the exhibit.
✗The port channel is Layer 3 instead of Layer 2Wrong answer — click to see why▾
Why this is wrong here
A Layer 3 port-channel can function correctly if configured properly. The output does not indicate any Layer 2 vs Layer 3 mismatch; the problem is that the member interfaces are not successfully bundling into the logical channel, as shown by the (s) and (I) status flags.
★ When this WOULD be the correct answer
In a different scenario, if a question specifies that an EtherChannel is configured as Layer 3 and the interfaces are expected to be Layer 2, then selecting this option would be correct. For example, if the question states that the EtherChannel is not forwarding traffic due to incorrect Layer 3 configuration, this option would apply.
Why candidates choose this
Test-takers may confuse the 'SD' (shutdown) state of the port-channel with a Layer 3 misconfiguration, but 'SD' simply means the logical interface is down due to member issues, not because of the layer at which it operates.
✗LACP requires exactly four links to form a bundleWrong answer — click to see why▾
Why this is wrong here
LACP does not require exactly four links; it can form bundles with 2 to 8 active links (and up to 16 total with standby). The exhibit shows only two member ports, which is perfectly valid for an EtherChannel.
★ When this WOULD be the correct answer
In a different question, if it specified that an EtherChannel configuration must have exactly four links to be valid, and the output showed only two links, then this option would be correct. For instance, a question could state that a network engineer is troubleshooting a configuration that mandates four links for LACP to function properly.
Why candidates choose this
Some students might recall that LACP has a maximum of 8 active links and mistakenly think a minimum of 4 is required, but no such minimum exists. The confusion may arise from the fact that many real-world designs use 4 links for load balancing, but that is not a protocol requirement.
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
Avoid assuming the problem is due to physical layer issues like speed or duplex when the output suggests a configuration mismatch.
Trap categories for this question
Keyword trap
A Layer 3 port-channel can work perfectly well when intentionally configured that way, so the phrase 'Layer 3' does not explain the failure on its own. The real problem shown here is that the member interfaces are not joining the logical channel correctly. The status flags point to a bundle formation problem, not simply to the channel being Layer 3 or Layer 2.
Command / output trap
Speed or duplex mismatches can definitely break an EtherChannel, which makes this option tempting. The problem is that the exhibit does not specifically prove that speed or duplex is the issue. It only proves that the links are not bundling correctly. On exam-style questions, choose the conclusion directly supported by the output before jumping to one of several possible hidden causes.
Detailed technical explanation
How to think about this question
EtherChannel technology allows multiple physical links to be aggregated into a single logical link, increasing bandwidth and providing redundancy between switches. Cisco supports EtherChannel using protocols like LACP, which dynamically negotiate link bundling. Each physical interface in the bundle must have matching configurations such as speed, duplex, VLAN trunking, and channel-group parameters to successfully form the logical port-channel. The switch uses status flags to indicate whether each member interface is bundled (s) or suspended (I). When LACP is used, the protocol exchanges negotiation packets to ensure both ends agree on the bundle membership. If any interface is suspended, it means the switch has detected a configuration mismatch or protocol disagreement preventing that interface from joining the bundle. The port-channel interface itself will not forward traffic until all member interfaces are properly bundled and the logical link is up. Troubleshooting involves verifying consistent settings across all member interfaces, including trunk modes, allowed VLANs, native VLANs, and channel-group numbers. A common exam trap is to assume that speed or duplex mismatches alone cause the bundle failure, but the output only shows the bundle status, not the root cause. Another trap is to think that the number of links or Layer 3 vs Layer 2 port-channel type causes the failure. In reality, the suspended interface flag indicates a bundle formation problem, which could stem from various configuration mismatches. Understanding how to interpret EtherChannel status flags and recognizing that the logical port-channel is down due to member interface suspension is critical for CCNA exam success and real-world troubleshooting.
KKey Concepts to Remember
- EtherChannel bundles multiple physical interfaces into a single logical link to increase bandwidth and provide redundancy.
- LACP (Link Aggregation Control Protocol) negotiates the formation of EtherChannel bundles dynamically between switches.
- A member interface marked as (s) is successfully bundled, while (I) indicates the interface is in a suspended state and not forwarding traffic.
- EtherChannel requires all member interfaces to have consistent configurations such as speed, duplex, VLAN trunking, and channel-group settings to form a healthy bundle.
- If any member interface is not bundled correctly, the logical port-channel remains down and does not forward traffic.
- Cisco switches display EtherChannel status flags to indicate the state of each member interface and the overall port-channel health.
- Common causes for suspended member interfaces include mismatched trunk configurations, native VLAN mismatches, or channel-group misconfigurations.
- The presence of a Layer 3 or Layer 2 port-channel alone does not cause forwarding failure; the bundle formation status is the critical factor.
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.
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.
What to study next
Got this wrong? Here's your next step.
Review etherChannel bundles multiple physical interfaces 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.
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FAQ
Questions learners often ask
What does this 200-301 question test?
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..
What is the correct answer to this question?
The correct answer is: At least one member interface is not bundled correctly, so the logical channel is down — The safest conclusion from this output is that the member interfaces are not successfully participating in the bundle, so the logical port-channel is down. Cisco exam questions often test whether you can read the status flags without overcommitting to a very specific root cause that the exhibit does not explicitly prove. One member is suspended and another is not bundled into the channel correctly, so the EtherChannel never reaches a healthy forwarding state. In the real world, that can happen because of trunk mismatches, allowed VLAN mismatches, native VLAN problems, inconsistent channel-group settings, or negotiation issues. The key exam skill is recognizing that the bundle itself failed, not guessing one hidden configuration line that is not shown.
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., 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.
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Last reviewed: May 17, 2026
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