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FC0-U71 Practice Question: A network technician is setting up a wireless…
A network technician is setting up a wireless network. To minimize interference from neighboring networks, which wireless frequency band is typically less congested?
⚠ Common exam trap
Many exam-takers assume 2.4 GHz is less congested because it has longer range, but they overlook that its limited non-overlapping channels and ubiquitous use by non-Wi-Fi devices (microwaves, Bluetooth) make it far more congested than 5 GHz.
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
✓
5 GHz
The 5 GHz band is typically less congested than the 2.4 GHz band because it has more non-overlapping channels (23 vs. 3) and is used by fewer devices, including legacy Wi-Fi clients. This reduces co-channel interference from neighboring networks, making 5 GHz the preferred choice for minimizing interference in dense wireless environments.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
900 MHz
Why it's wrong here
900 MHz is an unlicensed industrial, scientific and medical band used by legacy telemetry and cordless devices, and it is not a Wi-Fi band at all, so no standard WLAN client can associate. It tempts because 900 MHz penetrates obstacles well, making it correct for long-range sensor or SCADA links.
- ✓
5 GHz
Why this is correct
The 5 GHz band offers more non-overlapping channels and higher throughput than 2.4 GHz, and far fewer neighbouring networks operate there. This directly satisfies the stem's requirement to minimise interference from surrounding wireless networks, since 2.4 GHz is shared by microwaves, Bluetooth, and most legacy access points.
- ✗
2.4 GHz
Why it's wrong here
2.4 GHz carries only three non-overlapping channels and is shared by Bluetooth, microwaves and countless legacy access points, so co-channel interference is heaviest there. It tempts because 2.4 GHz propagates further through walls, making it the choice for long-range coverage rather than interference avoidance.
- ✗
60 GHz
Why it's wrong here
60 GHz offers wide channels but oxygen absorption limits range to roughly ten metres and it demands near line-of-sight, so it cannot serve a typical office WLAN. It tempts because 60 GHz is genuinely uncongested, making it correct for short-range, high-throughput links such as wireless docking.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This FC0-U71 practice question is part of Courseiva's free CompTIA 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 FC0-U71 exam.