The answer is 802.11ac, which delivers the highest throughput among the 5 GHz wireless standards. This is because 802.11ac, also known as Wi-Fi 5, operates exclusively in the 5 GHz band and leverages advanced technologies like 256-QAM modulation, channel bonding up to 160 MHz, and support for up to eight spatial streams, enabling theoretical data rates exceeding 6.9 Gbps. On the CompTIA Network+ N10-009 exam, this question tests your understanding of how 802.11ac’s exclusive use of the less-congested 5 GHz band minimizes co-channel interference in high-density environments, a key advantage over 802.11n which relies on both 2.4 GHz and 5 GHz. A common trap is confusing 802.11ac with 802.11ax (Wi-Fi 6), but remember that 802.11ac is the highest-throughput standard that operates solely in 5 GHz. For a quick memory tip, think “AC is 5 GHz only, and it’s the fastest of the old school.”
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 company is implementing a wireless network and needs to support high-density client environments with minimal interference. Which IEEE 802.11 standard operates in the 5 GHz band and provides the highest throughput among the options?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
802.11ac
802.11ac (Wi-Fi 5) operates exclusively in the 5 GHz band and supports up to 8 spatial streams, 256-QAM modulation, and channel bonding up to 160 MHz, yielding theoretical throughput exceeding 6.9 Gbps. This makes it the highest-throughput option among the listed standards for high-density environments with minimal interference, as the 5 GHz band offers more non-overlapping channels and less co-channel contention than 2.4 GHz.
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.
✓
802.11ac
Why this is correct
Correct. 802.11ac operates exclusively in the 5 GHz band and can achieve multi-gigabit throughput using wider channels, MIMO, and beamforming.
Related concept
Read the scenario before looking for a memorised answer.
✗
802.11n
Why it's wrong here
802.11n can operate in both 2.4 GHz and 5 GHz, but its maximum throughput is lower than 802.11ac.
✗
802.11g
Why it's wrong here
802.11g operates only in the 2.4 GHz band with maximum throughput of 54 Mbps.
✗
802.11b
Why it's wrong here
802.11b operates only in the 2.4 GHz band with maximum throughput of 11 Mbps.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 802.11n as the highest-throughput option because it supports both bands and is widely deployed, but they overlook that 802.11ac is strictly 5 GHz and offers significantly higher throughput through wider channels and higher-order modulation.
Detailed technical explanation
How to think about this question
802.11ac introduces Multi-User MIMO (MU-MIMO) in its Wave 2 revision, allowing simultaneous downlink transmissions to multiple clients, which is critical in high-density environments like stadiums or conference halls. The standard also employs beamforming (explicit transmit beamforming) to focus signals toward specific clients, reducing interference and improving SNR. In practice, 802.11ac access points with 4x4:4 spatial streams and 160 MHz channels can deliver real-world throughput of 1–2 Gbps, but channel bonding must be carefully planned to avoid DFS radar detection issues in the 5 GHz UNII-2 bands.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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: 802.11ac — 802.11ac (Wi-Fi 5) operates exclusively in the 5 GHz band and supports up to 8 spatial streams, 256-QAM modulation, and channel bonding up to 160 MHz, yielding theoretical throughput exceeding 6.9 Gbps. This makes it the highest-throughput option among the listed standards for high-density environments with minimal interference, as the 5 GHz band offers more non-overlapping channels and less co-channel contention than 2.4 GHz.
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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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.
Question Discussion
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