200-901 Network Fundamentals Practice Question
Which of the following is a non-overlapping channel in the 2.4 GHz Wi-Fi band?
⚠ Common exam trap
The trap here is assuming that any channel number that is a multiple of 3 (like 3, 6, 9, 12) is non-overlapping, but only 1, 6, and 11 are truly non-overlapping in the 2.4 GHz band.
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 Wi-Fi band, channels are spaced 5 MHz apart, but each channel is 22 MHz wide. To avoid overlap, channels must be separated by at least 5 channels (25 MHz). The only non-overlapping channels in North America are 1, 6, and 11. Channel 6 is one of these, making it the correct answer.
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 3
Why it's wrong here
Channel 3 overlaps channels 1 and 6 because each 2.4 GHz channel spans roughly 22 MHz while centre frequencies are only 5 MHz apart. Only 1, 6 and 11 are non-overlapping. Channel 3 would be chosen only where deliberate partial overlap with adjacent cells is acceptable.
- ✓
Channel 6
Why this is correct
In the 2.4 GHz band, only channels 1, 6 and 11 are conventionally non-overlapping, each separated by five 5 MHz steps so their 22 MHz-wide signals do not overlap. Channel 6 sits between 1 and 11, satisfying the stem's non-overlapping requirement.
- ✗
Channel 12
Why it's wrong here
Channel 12 overlaps channel 11 and sits outside the US regulatory range, so it is not a non-overlapping 2.4 GHz channel. Only 1, 6 and 11 avoid mutual overlap. Channel 12 is usable in regions permitting channels 12–13, where it may reduce interference from neighbouring 1/6/11 networks.
- ✗
Channel 9
Why it's wrong here
Channel 9 sits between channels 7 and 11, so its 22 MHz-wide signal overlaps both neighbours in the 2.4 GHz band. Only channels 1, 6 and 11 are conventionally non-overlapping there. Channel 9 would be usable where overlapping co-channel interference is tolerable, such as a single-AP home deployment.
About these practice questions
Courseiva writes every 200-901 question from scratch — 975 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Cisco exam blueprint
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.