200-901 Network Fundamentals Practice Question
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.)
⚠ Common exam trap
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.
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.
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.
- ✗
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.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.