- A
Channel 11
Why wrong: Channel 11 is non-overlapping but the question asks for two, so combining with 1 or 6 is valid. However, the question expects two answers, and three are non-overlapping; choosing 1 and 6 is a common pair.
- B
Channel 9
Why wrong: Channel 9 overlaps with channels 6 and 11.
- C
Channel 6
Channel 6 is non-overlapping with channels 1 and 11.
- D
Channel 3
Why wrong: Channel 3 overlaps with channels 1 and 6.
- E
Channel 1
Channel 1 is non-overlapping with channels 6 and 11.
Question 95 of 1,000
200-901 Network Fundamentals Practice Question
This 200-901 practice question tests your understanding of network fundamentals. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 designing a wireless network for an office that requires high throughput and minimal interference. Which two channels should be used for the 2.4 GHz band to avoid overlap? (Choose two.)
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
✓
Channel 6
In the 2.4 GHz band, channels 1, 6, and 11 are the only non-overlapping channels when using 20 MHz channel spacing, as each channel occupies 22 MHz of bandwidth and these three are spaced 25 MHz apart. Channels 1 and 6 are correct because they do not overlap, minimizing co-channel interference and maximizing throughput.
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.
- ✗
Channel 11
Why it's wrong here
Channel 11 is non-overlapping but the question asks for two, so combining with 1 or 6 is valid. However, the question expects two answers, and three are non-overlapping; choosing 1 and 6 is a common pair.
- ✗
Channel 9
Why it's wrong here
Channel 9 overlaps with channels 6 and 11.
- ✓
Channel 6
Why this is correct
Channel 6 is non-overlapping with channels 1 and 11.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Channel 3
Why it's wrong here
Channel 3 overlaps with channels 1 and 6.
- ✓
Channel 1
Why this is correct
Channel 1 is non-overlapping with channels 6 and 11.
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 any three channels (e.g., 1, 4, 8) are non-overlapping, but the correct non-overlapping set is strictly 1, 6, and 11 due to the 22 MHz channel width and 5 MHz spacing.
Detailed technical explanation
How to think about this question
The 2.4 GHz ISM band uses 14 channels (only 11 in the US), each 22 MHz wide with 5 MHz spacing, resulting in only channels 1, 6, and 11 being non-overlapping under IEEE 802.11b/g/n standards. In dense deployments, using only these three channels is critical to avoid adjacent-channel interference (ACI), which can reduce throughput by up to 50% due to packet retransmissions and CSMA/CA backoff delays.
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 practitioner preparing for the 200-901 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
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.
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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: Channel 6 — In the 2.4 GHz band, channels 1, 6, and 11 are the only non-overlapping channels when using 20 MHz channel spacing, as each channel occupies 22 MHz of bandwidth and these three are spaced 25 MHz apart. Channels 1 and 6 are correct because they do not overlap, minimizing co-channel interference and maximizing throughput.
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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