200-901 Network Fundamentals Practice Question
A network administrator is configuring a wireless network and wants to minimize interference. In the 2.4 GHz band, which set of channels are non-overlapping?
⚠ Common exam trap
200-901 often tests the memorized fact that 1, 6, and 11 are the non-overlapping 2.4 GHz channels, so candidates who assume any evenly spaced set (like 1, 5, 9, 13) works, or who forget the 20 MHz channel width, pick a wrong option.
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, the available channels are spaced 5 MHz apart, but each Wi-Fi channel is 20 MHz wide, so adjacent channels overlap. Only channels 1, 6, and 11 are spaced far enough apart (25 MHz between centers) to avoid overlapping in North America, making them the standard non-overlapping set. Using these three channels allows multiple access points to operate in close proximity with minimal co-channel interference.
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, 5, 9, 13
Why it's wrong here
In the 2.4 GHz band only channels 1, 6 and 11 are non-overlapping; 1, 5, 9 and 13 still overlap because each channel spans roughly 22 MHz. It tempts as an evenly spaced set, and would be valid in the 5 GHz band where channels are narrower and spacing differs.
- ✗
1, 3, 5, 7, 9, 11
Why it's wrong here
Channels 1, 3, 5, 7, 9 and 11 are only two apart, so each 22 MHz signal overlaps its neighbours heavily. Such a dense plan suits maximising raw throughput in low-interference environments, not avoiding co-channel interference.
- ✓
1, 6, 11
Why this is correct
In the 2.4 GHz band each channel is 22 MHz wide but spaced only 5 MHz apart, so channels 1, 6 and 11 are the only set separated enough to avoid overlapping spectrum and minimise interference.
- ✗
2, 7, 12
Why it's wrong here
Channels 2, 7 and 12 sit only five channels apart, so their 22 MHz-wide signals overlap and interfere. This spacing pattern would only be chosen where a non-standard regional plan permits it, not for minimising interference.
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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.