FC0-U71 Infrastructure Practice Question
A network administrator is designing a new office network. Which THREE factors should be considered when choosing between 2.4 GHz and 5 GHz Wi-Fi bands?
⚠ Common exam trap
FC0-U71 often tests whether candidates can distinguish band characteristics from unrelated networking factors — cellular compatibility and device count are distractors that sound plausible but do not define the 2.4 vs 5 GHz trade-off.
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
✓
Speed
Option B (Speed) is correct because the 5 GHz band offers wider channels (up to 80/160 MHz) and higher throughput than the narrower 2.4 GHz channels, making data rate a key decision factor. Option C (Interference) is correct because 2.4 GHz is crowded by overlapping channels, Bluetooth, microwaves, and neighboring APs, while 5 GHz has many more non-overlapping channels and thus less interference. Option E (Range) is correct because 2.4 GHz signals penetrate walls and travel farther due to longer wavelengths, whereas 5 GHz has shorter range, so coverage requirements must guide band selection. Option A (Cellular compatibility) is not a Wi-Fi band selection factor since cellular operates on licensed spectrum independent of 2.4/5 GHz WLAN design. Option D (Number of devices) is not a direct differentiator between the bands, as client capacity depends more on AP density, channel width, and airtime than on the band itself.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Cellular compatibility
Why it's wrong here
Cellular compatibility concerns mobile carrier bands, which are unrelated to the 2.4 GHz and 5 GHz unlicensed Wi-Fi spectrum. It is tempting because both involve radio frequencies, but the band choice depends on range, interference and channel width instead.
- ✓
Speed
Why this is correct
Speed differs by band: 5 GHz supports wider channels and higher throughput, while 2.4 GHz offers slower maximum data rates. This satisfies the scenario's requirement to weigh throughput when choosing a band for the office network, alongside range and interference considerations.
- ✓
Interference
Why this is correct
Interference varies by band: 2.4 GHz overlaps with microwaves, cordless phones and neighbouring networks, while 5 GHz has more non-overlapping channels and fewer competing devices. This satisfies the scenario's requirement to assess signal disruption when selecting a band for the office network.
- ✗
Number of devices
Why it's wrong here
Band selection does not directly limit device count.
- ✓
Range
Why this is correct
5 GHz signals attenuate faster through walls and floors, so its usable range is shorter than 2.4 GHz at the same transmit power. Range therefore directly determines coverage per access point, making it a genuine factor when choosing between the two bands for an office layout.
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Same concept, more angles
1 more way this is tested on FC0-U71
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. 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?
hard- A.Both experience equal interference
- B.5 GHz
- ✓ C.2.4 GHz
- D.Neither band experiences interference
Why C: 2.4 GHz has longer range but more interference from devices like microwaves and Bluetooth, and has fewer non-overlapping channels.
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 CompTIA exam blueprint
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.