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: etherChannel bundles 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.
Two switches are connected with an EtherChannel using LACP. The bundle stays down and the physical interfaces show individual links, not a port-channel member state. Which two conditions must match on both sides for the channel to form successfully?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The member interfaces must have compatible speed and duplex settings
LACP active/passive is valid, but the interfaces still have to match operationally and be configured compatibly for the same bundle. Speed, duplex, trunking, and channel protocol consistency all matter.
Key principle: EtherChannel bundles 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 member interfaces must have compatible speed and duplex settings
Why this is correct
Mismatched operational characteristics can prevent EtherChannel formation.
Related concept
EtherChannel bundles multiple physical Ethernet links into a single logical link to increase bandwidth and provide redundancy.
✗
The trunk native VLAN must always be VLAN 1
Why it's wrong here
The native VLAN can be other values as long as the trunks are otherwise compatible.
✓
The interfaces must use the same channel protocol and compatible LACP settings
Why this is correct
Both sides must support the same negotiation method and be configured compatibly for the same port-channel.
Related concept
EtherChannel bundles multiple physical Ethernet links into a single logical link to increase bandwidth and provide redundancy.
✗
The STP priority values on both switches must be identical
Why it's wrong here
STP priority has nothing to do with whether an EtherChannel forms.
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 interfaces must have compatible speed and duplex settingsCorrect answer▾
Why this is correct
Mismatched operational characteristics can prevent EtherChannel formation.
✗The trunk native VLAN must always be VLAN 1Wrong answer — click to see why▾
Why this is wrong here
The native VLAN does not have to be VLAN 1; it can be any VLAN as long as both sides of the trunk agree. The requirement for EtherChannel is that the native VLAN must match on both sides, but it does not have to be VLAN 1.
Why candidates choose this
Students often associate VLAN 1 with the default native VLAN and mistakenly think it is mandatory for trunking or EtherChannel, but in fact, the native VLAN can be changed and must simply be consistent.
✗The STP priority values on both switches must be identicalWrong answer — click to see why▾
Why this is wrong here
STP priority values do not affect EtherChannel formation; STP operates on the logical port-channel interface after the bundle is formed. EtherChannel requirements focus on physical and protocol compatibility, not spanning-tree parameters.
Why candidates choose this
Students may confuse STP configuration with EtherChannel requirements because both involve interface configuration, but STP priority is unrelated to the bundling process.
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
Remember that VLAN and trunking settings are important for trunk links but not specifically required for EtherChannel formation.
Detailed technical explanation
How to think about this question
EtherChannel is a technology that allows multiple physical Ethernet links to be combined 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 LACP to successfully form an EtherChannel, the physical interfaces on both sides must have compatible operational parameters such as speed and duplex settings, ensuring consistent link behavior and preventing mismatches that could cause the bundle to fail.
In addition to matching speed and duplex, both sides must use the same channel protocol and compatible LACP settings. This means that both switches must be configured to use LACP (not PAgP or static EtherChannel), and their LACP modes (active or passive) must be compatible to allow negotiation. If one side uses LACP and the other uses a different protocol or static configuration, the EtherChannel will not form, and the interfaces will remain as individual links.
A common exam trap is assuming that native VLAN settings or Spanning Tree Protocol (STP) priorities must match for EtherChannel formation. While trunking configurations like native VLAN should be consistent for proper traffic forwarding, they do not prevent the EtherChannel from forming. Similarly, STP priority values affect root bridge election and loop prevention but do not influence EtherChannel negotiation. Understanding these distinctions helps avoid misconfigurations and exam mistakes.
KKey Concepts to Remember
EtherChannel bundles multiple physical Ethernet links into a single logical link to increase bandwidth and provide redundancy.
LACP dynamically negotiates EtherChannel formation by exchanging protocol packets between switches to agree on link bundling.
All member interfaces in an EtherChannel must have matching speed and duplex settings to ensure consistent link operation.
Both sides of an EtherChannel must use the same channel protocol and compatible LACP settings for successful negotiation.
LACP modes active and passive are compatible and allow negotiation, but mismatched protocols prevent EtherChannel formation.
Trunk native VLAN settings do not prevent EtherChannel formation but must match for proper VLAN traffic forwarding.
STP priority values influence root bridge election but do not affect whether an EtherChannel bundle forms.
EtherChannel failure often results in physical interfaces remaining as individual links rather than joining a port-channel.
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 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 bundles 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 bundles 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 member interfaces must have compatible speed and duplex settings — LACP active/passive is valid, but the interfaces still have to match operationally and be configured compatibly for the same bundle. Speed, duplex, trunking, and channel protocol consistency all matter.
What should I do if I get this 200-301 question wrong?
Review etherChannel bundles 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.
What is the key concept behind this question?
EtherChannel bundles multiple physical Ethernet links into a single logical link to increase bandwidth and provide redundancy.
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