- A
1, 6, 11
These are the standard non-overlapping channels.
- B
2, 7, 12
Why wrong: Channel 12 is not available in all regulatory domains, and 2 and 7 overlap.
- C
1, 5, 9
Why wrong: These channels overlap.
- D
1, 3, 5
Why wrong: Channels 1, 3, and 5 overlap.
Question 518 of 1,000
200-901 Network Fundamentals Practice Question
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.
A network engineer is configuring a wireless network for a hospital that requires high throughput and minimal interference from neighboring networks. Which set of 2.4 GHz channels should be used for non-overlapping coverage?
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
✓
1, 6, 11
In the 2.4 GHz ISM band, channels 1, 6, and 11 are the only three non-overlapping channels, each separated by 25 MHz, which prevents co-channel interference. This configuration maximizes throughput and minimizes interference from neighboring networks, making it ideal for high-density environments like hospitals.
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.
- ✓
1, 6, 11
Why this is correct
These are the standard non-overlapping channels.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
2, 7, 12
Why it's wrong here
Channel 12 is not available in all regulatory domains, and 2 and 7 overlap.
- ✗
1, 5, 9
Why it's wrong here
These channels overlap.
- ✗
1, 3, 5
Why it's wrong here
Channels 1, 3, and 5 overlap.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that any set of channels spaced 5 apart (e.g., 1, 6, 11) is the only valid set, but candidates may mistakenly think channels like 2, 7, 12 or 1, 5, 9 are also non-overlapping due to misunderstanding of channel width and regulatory restrictions.
Detailed technical explanation
How to think about this question
The 2.4 GHz band spans 2.400–2.4835 GHz, with each channel occupying 22 MHz (20 MHz for data plus guard bands). Non-overlapping channels require a minimum of 25 MHz separation, which is why only channels 1 (2.412 GHz), 6 (2.437 GHz), and 11 (2.462 GHz) meet this criterion. In real-world hospital deployments, using these channels with proper cell planning (e.g., adjacent APs on different channels) is critical to avoid interference from medical telemetry and neighboring Wi-Fi networks.
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 network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this 200-901 question test?
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: 1, 6, 11 — In the 2.4 GHz ISM band, channels 1, 6, and 11 are the only three non-overlapping channels, each separated by 25 MHz, which prevents co-channel interference. This configuration maximizes throughput and minimizes interference from neighboring networks, making it ideal for high-density environments like hospitals.
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.
About these practice questions
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Last reviewed: Jul 4, 2026
This 200-901 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 200-901 exam.
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