The answer is the 5 GHz band, because it provides up to 23 non-overlapping channels when using 20 MHz channel widths, compared to just three in the 2.4 GHz band. This abundance of channels allows for superior channel reuse in a dense environment like an open office with 50 users, drastically reducing co-channel interference and enabling higher aggregate throughput. On the CompTIA Network+ N10-009 exam, this concept tests your understanding of frequency band planning for high-density deployments—a common scenario where the trap is choosing 2.4 GHz for its longer range, forgetting that its limited non-overlapping channels cause severe congestion with many clients. A key memory tip is to remember “5 for 25”: the 5 GHz band offers over 20 non-overlapping channels, making it the clear choice for maximizing performance in crowded spaces.
N10-009 Network Implementation Practice Question
This N10-009 practice question tests your understanding of network implementation. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
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?
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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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
2.4 GHz has only three non-overlapping channels, limiting performance in dense deployments.
✓
5 GHz
Why this is correct
5 GHz provides many non-overlapping channels, allowing better channel planning and reduced interference.
Related concept
Read the scenario before looking for a memorised answer.
✗
6 GHz
Why it's wrong here
While 6 GHz offers many channels, it is not yet widely deployed and has shorter range; 5 GHz is more practical for current deployments.
✗
900 MHz
Why it's wrong here
900 MHz is typically used for long-range, low-bandwidth IoT applications, not for high-density WLANs.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco 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.
Detailed technical explanation
How to think about this question
In the 5 GHz band, the use of DFS (Dynamic Frequency Selection) channels (52-144) adds more non-overlapping channels but requires radar detection, which can cause temporary channel unavailability. For high-density deployments, channel bonding (e.g., 40 MHz or 80 MHz) reduces the number of available non-overlapping channels, so careful planning with 20 MHz channels is often recommended to maximize spatial reuse and minimize contention. Real-world scenarios like conference halls or open offices benefit from using 5 GHz exclusively to avoid the congestion and interference common in the 2.4 GHz ISM band.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the N10-009 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this N10-009 question in full detail.
Network Implementation — This question tests Network Implementation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 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.
What should I do if I get this N10-009 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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