FC0-U71 Infrastructure Practice Question
A network technician is troubleshooting intermittent Wi-Fi dropouts in a crowded office building. The office uses 2.4 GHz and 5 GHz dual-band access points. Users report better range but more interference on one band. Which frequency band is likely experiencing more interference?
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
✓
2.4 GHz
2.4 GHz has longer range but more interference from devices like microwaves and Bluetooth, and has fewer non-overlapping channels.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Both experience equal interference
Why it's wrong here
Interference differs by band: 2.4 GHz shares spectrum with microwaves, Bluetooth and neighbouring APs across only three non-overlapping channels, while 5 GHz offers far more channels. Claiming parity ignores this channel-overlap mechanism. It is tempting when both bands show some noise, but equal interference would require identical channel overlap and competing devices on each band.
- ✗
5 GHz
Why it's wrong here
5 GHz has more non-overlapping channels and fewer competing devices, so it typically suffers less interference; the stem's better range points to 2.4 GHz, whose longer wavelengths penetrate walls further. It is tempting because 5 GHz has shorter range, which users may misread as dropouts, but range loss is not interference.
- ✓
2.4 GHz
Why this is correct
2.4 GHz offers greater range but shares its narrow spectrum with microwaves, Bluetooth and neighbouring networks, so overlapping channels cause interference. The stem's better-range-but-more-interference report matches this band, whereas 5 GHz provides more non-overlapping channels.
- ✗
Neither band experiences interference
Why it's wrong here
The stem explicitly reports more interference on one band, so neither-band-experiences-interference contradicts the observed symptom. 2.4 GHz overlaps with microwaves, Bluetooth and adjacent APs across three non-overlapping channels, making interference unavoidable in a crowded building. It is tempting only if the dropouts were caused solely by distance or faulty hardware rather than RF contention.
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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.