N10-009 Network Implementation Practice Question
A network engineer is planning a wireless LAN for an open office with 50 users. To maximize performance by using multiple non-overlapping channels, which frequency band should be primarily used?
⚠ Common exam trap
The N10-009 exam often tests the misconception that more channels always mean better performance, but the trap here is that candidates may overlook client device compatibility and regulatory availability when considering the 6 GHz band, or they may incorrectly assume the 2.4 GHz band's longer range is beneficial for high-density performance.
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
✓
5 GHz
The 5 GHz band is the best choice for maximizing performance in an open office with 50 users because it offers up to 23 non-overlapping channels (using 20 MHz channels) compared to only 3 in the 2.4 GHz band. This allows for better channel reuse, reduced co-channel interference, and higher aggregate throughput in a dense user environment.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
2.4 GHz
Why it's wrong here
While the 2.4 GHz band offers better penetration and range than 5 GHz, it suffers from severe limitations in high-density environments. With only three truly non-overlapping 20 MHz channels (1, 6, and 11), it quickly becomes saturated with co-channel interference when multiple access points and numerous client devices are present, leading to reduced throughput and unreliable connectivity for 50 users in an open office. Furthermore, it's susceptible to interference from other common devices like Bluetooth and microwaves.
When this WOULD be correct
A question asking for the best frequency band for maximum range or wall penetration in a large, sparsely populated area (e.g., a warehouse with few users) would make 2.4 GHz correct due to its lower attenuation and better obstacle penetration.
- ✓
5 GHz
Why this is correct
For an open office with 50 users, high density and performance are key. The 5 GHz band offers significantly more non-overlapping channels (e.g., 23 in the U.S. for 20 MHz channels) compared to 2.4 GHz. This abundance of channels facilitates robust channel planning, minimizes co-channel interference between access points, and supports higher data rates for numerous concurrent users, making it ideal for high-density WLANs in office environments.
- ✗
6 GHz
Why it's wrong here
While 6 GHz offers numerous non-overlapping channels via the 802.11ax standard, its shorter wavelength causes significantly faster signal attenuation through office walls and open-plan obstructions, making it unsuitable for reliably covering 50 users across a typical open office without dense, costly access-point deployment. This option is tempting because the 6 GHz band’s wide channel allocation is ideal for high-density, low-interference environments like auditoriums or conference halls, where clients are stationary and close to the access point.
When this WOULD be correct
A question specifying a high-density environment with many Wi-Fi 6E-capable devices and a need for maximum throughput with minimal interference, where coverage range is less critical (e.g., a conference room or auditorium with devices close to access points).
- ✗
900 MHz
Why it's wrong here
The 900 MHz band operates at a much lower frequency, offering excellent penetration through obstacles and longer range. However, its extremely limited bandwidth and channel availability are unsuitable for the high data rates and user density required by a modern office WLAN. This band is primarily reserved for specialized, low-bandwidth applications like industrial IoT sensors or SCADA systems, not general-purpose Wi-Fi.
When this WOULD be correct
A question asking for the best frequency band for long-range, low-data-rate IoT sensor networks or rural outdoor coverage where wall penetration and distance are prioritized over throughput.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The N10-009 exam frequently reuses these exact scenarios with slightly different constraints.
✓5 GHzCorrect answer▾
Why this is correct
For an open office with 50 users, high density and performance are key. The 5 GHz band offers significantly more non-overlapping channels (e.g., 23 in the U.S. for 20 MHz channels) compared to 2.4 GHz. This abundance of channels facilitates robust channel planning, minimizes co-channel interference between access points, and supports higher data rates for numerous concurrent users, making it ideal for high-density WLANs in office environments.
✗2.4 GHzWrong answer — click to see why▾
Why this is wrong here
The 2.4 GHz band has only three non-overlapping channels (1, 6, 11), limiting performance in high-density environments like an open office with 50 users. The 5 GHz band offers many more non-overlapping channels, reducing co-channel interference.
★ When this WOULD be the correct answer
A question asking for the best frequency band for maximum range or wall penetration in a large, sparsely populated area (e.g., a warehouse with few users) would make 2.4 GHz correct due to its lower attenuation and better obstacle penetration.
Why candidates choose this
Candidates may recall that 2.4 GHz has better range and penetration, but overlook that the question emphasizes 'multiple non-overlapping channels' and 'maximize performance' in a dense user environment, where channel availability is critical.
✗6 GHzWrong answer — click to see why▾
Why this is wrong here
The 6 GHz band (Wi-Fi 6E) offers many non-overlapping channels, but the question asks for the band to be 'primarily used' in an open office with 50 users. While 6 GHz provides high capacity, its shorter range and poorer penetration through obstacles make it less suitable as the primary band for general coverage in an open office compared to 5 GHz, which balances range and channel availability.
★ When this WOULD be the correct answer
A question specifying a high-density environment with many Wi-Fi 6E-capable devices and a need for maximum throughput with minimal interference, where coverage range is less critical (e.g., a conference room or auditorium with devices close to access points).
Why candidates choose this
Candidates may know that 6 GHz offers the most non-overlapping channels and highest capacity, leading them to choose it without considering the practical limitations of range and device support in a typical open office.
✗900 MHzWrong answer — click to see why▾
Why this is wrong here
The 900 MHz band offers very limited non-overlapping channels (typically 1-2) and low data rates, making it unsuitable for maximizing performance in a dense 50-user open office environment.
★ When this WOULD be the correct answer
A question asking for the best frequency band for long-range, low-data-rate IoT sensor networks or rural outdoor coverage where wall penetration and distance are prioritized over throughput.
Why candidates choose this
Candidates may mistakenly think lower frequency always means better performance due to better range, or confuse 900 MHz with the 900 MHz ISM band used in some legacy or specialized applications.
Analysis generated from the official N10-009blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Go deeper
Related to this question
Learn chapter
Wireless Standards and Configuration
Key term
LAN
Local Area Network — a network confined to a single physical location such as an office, building, or campus.
Key term
Throughput
Throughput is the rate at which data is successfully transferred from one point to another over a network, typically measured in bits per second.
About these practice questions
This N10-009 question is part of Courseiva's 464-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This N10-009 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 N10-009 exam.