This 200-901 practice question tests your understanding of network fundamentals. 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. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
VLAN 100 traffic is allowed across the trunk.
The correct answer is D because the exhibit shows that VLAN 100 is configured on both switches and is included in the allowed VLAN list on the trunk. EtherChannel does not affect VLAN filtering; the trunk's allowed VLAN list determines which VLANs can traverse the link. Since VLAN 100 is explicitly permitted, its traffic is allowed across the trunk.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
VLAN 100 is allowed on both switches (1-100 on A, 100-199 on B).
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that EtherChannel overrides or bypasses VLANtrunk filtering, but in reality, the allowed VLAN list on the port-channel interface still controls which VLANs are permitted across the aggregated link.
Detailed technical explanation
How to think about this question
EtherChannel aggregates multiple physical links into a single logical interface, but VLAN trunking behavior (including allowed VLAN lists) is applied to the port-channel interface itself, not the individual member ports. The 'switchport trunk allowed vlan' command filters traffic at Layer 2, and any VLAN not in the list is dropped. In real-world scenarios, misconfigured allowed VLAN lists are a common cause of connectivity issues, especially when adding new VLANs to a network.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
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
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Network Fundamentals — This question tests Network Fundamentals — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: VLAN 100 traffic is allowed across the trunk. — The correct answer is D because the exhibit shows that VLAN 100 is configured on both switches and is included in the allowed VLAN list on the trunk. EtherChannel does not affect VLAN filtering; the trunk's allowed VLAN list determines which VLANs can traverse the link. Since VLAN 100 is explicitly permitted, its traffic is allowed across the trunk.
What should I do if I get this 200-901 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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