CCNA Switching and Network Access Practice Question
This 200-301 practice question tests your understanding of switching and network access. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. A key principle to apply: etherChannel bundles multiple physical Ethernet 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.
What is a common requirement for interfaces to successfully bundle into an EtherChannel?
EtherChannel bundles multiple physical Ethernet interfaces into a single logical link to increase bandwidth and provide redundancy.
✗
Each interface must belong to a different VLAN
Why it's wrong here
Interfaces do not need to be in different VLANs.
When this WOULD be correct
In a different context, a question might ask about the configuration of multiple VLANs across different switches, where it is necessary to specify that each interface in a specific EtherChannel must belong to distinct VLANs for load balancing or segmentation purposes.
✗
Only odd-numbered switch ports can be bundled
Why it's wrong here
Port numbering does not determine EtherChannel eligibility.
When this WOULD be correct
In a different question asking about specific configurations for a unique switch model that only supports bundling on odd-numbered ports, option C would be correct. For instance, if the exam question specified that only odd-numbered ports are allowed for EtherChannel due to hardware limitations, then this option would apply.
✗
Each interface must have a different STP path cost
Why it's wrong here
Different STP costs are not a bundling requirement.
When this WOULD be correct
In a different exam scenario, if the question asked about configuring multiple EtherChannels with specific STP configurations for redundancy, then having different STP path costs might be correct if the intention is to control traffic flow and redundancy in a complex network design.
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.
✓All member interfaces must use matching speed, duplex, and trunk/access settingsCorrect answer▾
✗Each interface must belong to a different VLANWrong answer — click to see why▾
Why this is wrong here
EtherChannel does not require interfaces to be in different VLANs; in fact, all member interfaces must have the same VLAN configuration (either all access ports in the same VLAN or all trunk ports with the same allowed VLAN list). Placing interfaces in different VLANs would violate the consistency requirement and prevent bundling.
★ When this WOULD be the correct answer
In a different context, a question might ask about the configuration of multiple VLANs across different switches, where it is necessary to specify that each interface in a specific EtherChannel must belong to distinct VLANs for load balancing or segmentation purposes.
Why candidates choose this
Students might mistakenly think that different VLANs are needed to avoid loops or to distribute traffic, confusing EtherChannel with concepts like VLAN load balancing or separate broadcast domains.
✗Only odd-numbered switch ports can be bundledWrong answer — click to see why▾
Why this is wrong here
Port numbering (odd or even) has no bearing on EtherChannel eligibility; any physical ports on a switch can be bundled as long as they meet the configuration consistency requirements. The restriction is based on hardware capabilities, not port numbers.
★ When this WOULD be the correct answer
In a different question asking about specific configurations for a unique switch model that only supports bundling on odd-numbered ports, option C would be correct. For instance, if the exam question specified that only odd-numbered ports are allowed for EtherChannel due to hardware limitations, then this option would apply.
Why candidates choose this
Some students may recall that certain switch models group ports into port channels based on numbering (e.g., only consecutive ports), but this is a hardware limitation, not a general rule. The odd/even distinction is a common myth.
✗Each interface must have a different STP path costWrong answer — click to see why▾
Why this is wrong here
STP path cost is a per-interface value used by Spanning Tree Protocol to determine the best path to the root bridge; it is not a requirement for EtherChannel bundling. In fact, when interfaces are bundled, STP treats the EtherChannel as a single logical link, and all member interfaces share the same STP state.
★ When this WOULD be the correct answer
In a different exam scenario, if the question asked about configuring multiple EtherChannels with specific STP configurations for redundancy, then having different STP path costs might be correct if the intention is to control traffic flow and redundancy in a complex network design.
Why candidates choose this
Students might confuse the need for consistent STP parameters with the requirement for consistent interface settings, or think that different path costs help load balancing, but load balancing in EtherChannel is based on hashing algorithms, not STP costs.
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 EtherChannel is concerned with Layer 2 settings like speed and duplex, not Layer 3 settings like IP addresses.
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. This bundling requires that all member interfaces share consistent operational parameters to function correctly as a single aggregated link. Key parameters include speed, duplex mode, and switchport mode (trunk or access). These settings ensure that frames are transmitted and received uniformly across all links, preventing issues such as frame loss or misordering.
The decision process for bundling interfaces into an EtherChannel involves verifying that each interface matches in speed, duplex, and trunk/access configuration. Cisco switches enforce these requirements strictly; any mismatch in these settings causes the EtherChannel negotiation to fail or the bundle to be disabled. This consistency is crucial because differing speeds or duplex modes can cause traffic imbalance or collisions, while mismatched trunk/access modes can lead to VLAN tagging conflicts.
A common exam trap is assuming that interfaces can belong to different VLANs or have different STP costs and still bundle successfully. However, EtherChannel requires uniform VLAN membership and consistent STP parameters across all member ports. In practice, if interfaces have different VLAN assignments or STP path costs, the EtherChannel will not form, leading to network instability or link failures. Understanding these requirements helps avoid misconfiguration and ensures reliable link aggregation in Cisco environments.
KKey Concepts to Remember
EtherChannel bundles multiple physical Ethernet interfaces into a single logical link to increase bandwidth and provide redundancy.
All member interfaces in an EtherChannel must have matching speed settings to prevent traffic imbalance and ensure proper frame transmission.
Duplex mode must be consistent across all EtherChannel member interfaces to avoid collisions and communication errors.
Switchport mode, whether trunk or access, must be identical on all interfaces to maintain VLAN tagging consistency within the EtherChannel.
Cisco switches enforce strict matching of operational parameters before allowing interfaces to bundle into an EtherChannel.
Mismatched VLAN assignments on member interfaces prevent EtherChannel formation due to inconsistent traffic handling.
Different Spanning Tree Protocol (STP) path costs on member interfaces do not meet EtherChannel bundling requirements and cause failure.
EtherChannel improves network performance by aggregating links but requires uniform configuration to function correctly.
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 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.
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 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.
Switching and Network Access — This question tests Switching and Network Access — EtherChannel bundles multiple physical Ethernet interfaces into a single logical link to increase bandwidth and provide redundancy..
What is the correct answer to this question?
The correct answer is: All member interfaces must use matching speed, duplex, and trunk/access settings — EtherChannel members must have compatible operational and administrative settings, including speed, duplex, and switchport mode.
What should I do if I get this 200-301 question wrong?
Review etherChannel bundles multiple physical Ethernet 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.
What is the key concept behind this question?
EtherChannel bundles multiple physical Ethernet interfaces into a single logical link to increase bandwidth and provide redundancy.
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