FC0-U71 Infrastructure Practice Question
A company wants to deploy a new wireless network in its office. The network must support high device density and minimize interference from neighboring networks. Which Wi-Fi standard and frequency band combination is most suitable?
⚠ Common exam trap
FC0-U71 often tests the misconception that 802.11ac supports 2.4GHz (it does not) and that 2.4GHz is better for density (it is not, due to limited channels and 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
✓
802.11ax on 5GHz
802.11ax (Wi-Fi 6) on 5GHz (C) is the best choice because Wi-Fi 6 introduces OFDMA, MU-MIMO, and BSS Coloring, which improve spectral efficiency and reduce interference in high-density environments. The 5GHz band offers more non-overlapping channels and less interference than 2.4GHz, making it ideal for dense office deployments.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
802.11n on 5GHz
Why it's wrong here
802.11n caps at 40MHz channels and lower spatial streams, so it handles dense client loads less effectively than 802.11ac or 802.11ax on the same 5GHz band. It is tempting because 5GHz does reduce neighbour interference, and 802.11n is widely supported, but the standard itself limits density capacity.
- ✗
802.11ax on 2.4GHz
Why it's wrong here
802.11ax on 2.4GHz offers only three non-overlapping channels, so high device density and neighbouring-network interference cannot both be mitigated. It is tempting because 802.11ax adds OFDMA and BSS colouring, and would be correct where range through walls matters more than density or interference.
- ✓
802.11ax on 5GHz
Why this is correct
802.11ax on 5GHz satisfies the high-density requirement through OFDMA and MU-MIMO, which schedule multiple clients simultaneously rather than contending for airtime. The 5GHz band offers many more non-overlapping channels than 2.4GHz, reducing co-channel interference from neighbouring networks.
- ✗
802.11ac on 2.4GHz
Why it's wrong here
802.11ac does not operate on 2.4GHz at all; it is a 5GHz-only amendment, so this pairing is technically invalid. The 2.4GHz band's three non-overlapping channels and heavy neighbour congestion directly worsen the interference and density the scenario must minimise. It tempts because 802.11ac offers high throughput, but only on 5GHz.
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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 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.