FC0-U71 Infrastructure Practice Question
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.)
⚠ Common exam trap
FC0-U71 often tests the misconception that 2.4GHz is 'better' because of longer range — candidates must remember that the question asks for fastest speeds and least interference, which favors 5GHz and the newest 802.11 standard.
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
✓
5GHz
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.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
5GHz
Why this is correct
5GHz offers wider channels and far more non-overlapping ones than 2.4GHz, whose band is congested by microwaves, Bluetooth and neighbouring networks. This directly satisfies the stem's "least interference" constraint, while its higher throughput potential supports the "fastest speeds" requirement for the branch office.
- ✗
2.4GHz
Why it's wrong here
2.4GHz is congested by microwaves, Bluetooth and neighbouring access points, and its narrower channels cap throughput below 5GHz or 6GHz. It is tempting because 2.4GHz offers longer range and better wall penetration, making it the right band where coverage through obstacles matters more than speed.
- ✓
802.11ax
Why this is correct
802.11ax (Wi-Fi 6) delivers the fastest throughput by using OFDMA and 1024-QAM, and it operates on both 2.4 GHz and 5 GHz bands. Selecting it satisfies the stem's speed requirement, while its efficiency under dense client loads reduces contention compared with earlier standards.
- ✗
802.11ac
Why it's wrong here
802.11ac operates only in the 5GHz band, so it cannot satisfy a requirement that also names the frequency band, and 802.11ax supersedes it. It is tempting because 802.11ac delivers high throughput, and it would be correct where a 5GHz-only access point is acceptable and Wi-Fi 6 hardware is unavailable.
- ✗
Bluetooth
Why it's wrong here
Bluetooth operates in the 2.4GHz band over short distances at low data rates, so it cannot deliver the fastest speeds or least interference for a branch office. It is tempting because Bluetooth is a wireless standard, and it would be the right choice for pairing peripherals such as headsets, keyboards and mice.
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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.