FC0-U71 Infrastructure Practice Question
A network technician is troubleshooting a slow wireless connection in a crowded office. The office uses many Wi-Fi networks and devices. Which Wi-Fi standard would be best to minimize interference and provide faster speeds?
⚠ Common exam trap
FC0-U71 often tests the misconception that the newest/highest-numbered standard is always best, but the real trap is confusing raw throughput (802.11ac) with density efficiency (802.11ax) in interference-heavy environments.
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 (Wi-Fi 6)
802.11ax (Wi-Fi 6) is the best choice because it operates on both 2.4 GHz and 5 GHz (and 6 GHz in Wi-Fi 6E) and introduces OFDMA, MU-MIMO, BSS Coloring, and Target Wake Time. BSS Coloring specifically reduces interference in dense environments by allowing overlapping BSSs to distinguish each other's frames, and OFDMA improves spectral efficiency for many simultaneous clients. These features directly address the crowded-office scenario.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
802.11g
Why it's wrong here
802.11g operates only in the congested 2.4 GHz band, so it cannot avoid the interference from the many neighbouring networks described. It is tempting because it is widely supported and backward compatible, but 802.11g would suit a legacy environment where 5 GHz capability is unavailable.
- ✗
802.11n (Wi-Fi 4)
Why it's wrong here
Wi-Fi 4 is even older and slower.
- ✓
802.11ax (Wi-Fi 6)
Why this is correct
Wi-Fi 6 offers better performance in dense deployments.
- ✗
802.11ac (Wi-Fi 5)
Why it's wrong here
Wi-Fi 5 is older and less efficient in crowded environments.
Go deeper
Related to this question
About these practice questions
One of 988 original FC0-U71 practice questions on Courseiva, each with a full explanation and wrong-answer analysis — not exam dumps or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
5 more ways 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 company is setting up a new branch office. The network administrator needs to choose a wireless standard and a frequency band. Which TWO of the following options would provide the fastest speeds and least interference? (Select TWO.)
medium- ✓ A.5GHz
- B.2.4GHz
- ✓ C.802.11ax
- D.802.11ac
- E.Bluetooth
Why A: Option A (5GHz) is correct because the 5GHz band offers more non-overlapping channels and is far less congested than 2.4GHz, which directly reduces interference in a branch office environment. Option C (802.11ax) is correct because Wi-Fi 6 (802.11ax) delivers the highest throughput and best spectral efficiency of the listed standards, using OFDMA, MU-MIMO, and 1024-QAM to provide the fastest speeds. Option B (2.4GHz) is not selected because it is heavily congested by neighboring networks, Bluetooth, and microwaves, causing more interference and lower speeds. Option D (802.11ac) is not selected because, while fast, it is an older Wi-Fi 5 standard that is slower and less efficient than 802.11ax. Option E (Bluetooth) is not selected because it is a short-range personal area network technology with very low throughput, not a WLAN standard for branch office connectivity.
Variation 2. 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?
medium- A.802.11n on 5GHz
- B.802.11ax on 2.4GHz
- ✓ C.802.11ax on 5GHz
- D.802.11ac on 2.4GHz
Why C: 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.
Variation 3. A technician needs to install a wireless network in a large warehouse. The goal is to minimize interference and support many devices. Which frequency band is best for this scenario?
medium- ✓ A.5 GHz
- B.60 GHz
- C.900 MHz
- D.2.4 GHz
Why A: The 5 GHz frequency band is best for a large warehouse with many devices because it offers more non-overlapping channels, higher data rates, and less interference from common sources like microwaves and Bluetooth. While 5 GHz has shorter range than 2.4 GHz, in a warehouse, multiple access points can be deployed to provide coverage, and the reduced interference supports many devices simultaneously.
Variation 4. A user is experiencing slow Wi-Fi performance at home. The router supports both 2.4GHz and 5GHz bands. Which frequency band would provide faster speeds but shorter range?
medium- A.NFC
- B.2.4GHz
- C.Bluetooth
- ✓ D.5GHz
Why D: The 5GHz band offers higher speeds but has shorter range and is less prone to interference compared to 2.4GHz.
Variation 5. A user's home wireless network is experiencing interference. Which frequency band is more prone to interference from devices like microwaves and cordless phones?
medium- A.60 GHz
- B.5 GHz
- C.900 MHz
- ✓ D.2.4 GHz
Why D: The 2.4 GHz frequency band is more prone to interference from common household devices like microwaves, cordless phones, and Bluetooth devices because these devices operate in the same unlicensed ISM band. This band is crowded and only has three non-overlapping channels (1, 6, and 11), making it susceptible to signal degradation. In contrast, 5 GHz and 60 GHz bands are less congested and have more channels, reducing interference.
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.