N10-009 Network Implementation Practice Question
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?
⚠ Common exam trap
Many exam-takers 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.
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
✓
802.11ac
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.
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
802.11ac is the optimal choice for high-throughput wireless networks because it operates exclusively in the less congested 5 GHz band, supporting wider channels up to 160 MHz. This standard leverages advanced technologies like multi-user MIMO (MU-MIMO) and beamforming to achieve theoretical multi-gigabit speeds, making it ideal for demanding applications requiring significant bandwidth.
- ✗
802.11n
Why it's wrong here
While 802.11n introduced significant improvements like MIMO and dual-band operation (2.4 GHz and 5 GHz), its maximum theoretical throughput of up to 600 Mbps is considerably lower than newer standards. Although it was a high-performance standard in its time, it cannot meet the demands of modern 'high throughput' requirements as effectively as 802.11ac.
When this WOULD be correct
A question asking for a standard that supports both 2.4 GHz and 5 GHz bands for backward compatibility with older devices, or one that specifies a mixed-band environment without requiring the highest throughput.
- ✗
802.11g
Why it's wrong here
802.11g operates solely in the crowded 2.4 GHz band, which is prone to interference from other devices like microwaves and Bluetooth. Its maximum theoretical throughput is limited to 54 Mbps, which is insufficient for supporting contemporary high-bandwidth applications or a network requiring substantial data transfer capabilities.
When this WOULD be correct
A question asking for a legacy standard that operates in the 2.4 GHz band and is backward-compatible with 802.11b, with a maximum throughput of 54 Mbps, would make 802.11g the correct answer.
- ✗
802.11b
Why it's wrong here
802.11b is an older standard that operates exclusively in the highly congested 2.4 GHz frequency band. With a maximum theoretical throughput of only 11 Mbps, it is completely inadequate for any modern network requiring high data transfer speeds or supporting multiple users simultaneously. This standard is considered obsolete for performance-oriented deployments.
When this WOULD be correct
A question asking for the oldest 802.11 standard that operates in the 2.4 GHz band and provides basic wireless connectivity for legacy devices.
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.
✓802.11acCorrect answer▾
Why this is correct
802.11ac is the optimal choice for high-throughput wireless networks because it operates exclusively in the less congested 5 GHz band, supporting wider channels up to 160 MHz. This standard leverages advanced technologies like multi-user MIMO (MU-MIMO) and beamforming to achieve theoretical multi-gigabit speeds, making it ideal for demanding applications requiring significant bandwidth.
✗802.11nWrong answer — click to see why▾
Why this is wrong here
802.11n operates in both 2.4 GHz and 5 GHz bands but provides lower maximum throughput (up to 600 Mbps) compared to 802.11ac, which can exceed 1 Gbps in the 5 GHz band, making it unsuitable for the highest throughput requirement.
★ When this WOULD be the correct answer
A question asking for a standard that supports both 2.4 GHz and 5 GHz bands for backward compatibility with older devices, or one that specifies a mixed-band environment without requiring the highest throughput.
Why candidates choose this
Candidates may confuse 802.11n as a high-throughput option because it introduced MIMO and channel bonding, but they overlook that 802.11ac offers significantly higher throughput by using wider channels and more spatial streams.
✗802.11gWrong answer — click to see why▾
Why this is wrong here
802.11g operates in the 2.4 GHz band, not the 5 GHz band, and its maximum throughput is 54 Mbps, which is far lower than 802.11ac's multi-Gbps speeds.
★ When this WOULD be the correct answer
A question asking for a legacy standard that operates in the 2.4 GHz band and is backward-compatible with 802.11b, with a maximum throughput of 54 Mbps, would make 802.11g the correct answer.
Why candidates choose this
Candidates may confuse 802.11g with 802.11ac because both are 'g' and 'ac' letters, or they might think 'g' is newer than 'n' and thus faster, overlooking the band and throughput specifications.
✗802.11bWrong answer — click to see why▾
Why this is wrong here
802.11b operates in the 2.4 GHz band with a maximum throughput of 11 Mbps, far below the 5 GHz band and high throughput required for high-density environments.
★ When this WOULD be the correct answer
A question asking for the oldest 802.11 standard that operates in the 2.4 GHz band and provides basic wireless connectivity for legacy devices.
Why candidates choose this
Candidates may confuse 802.11b with 802.11ac due to similar letter naming, or mistakenly think 'b' is a newer standard than it is.
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
Basic Service Set Identifier
A Basic Service Set Identifier (BSSID) is the unique hardware address that identifies a specific wireless access point or a group of wireless devices communicating together.
Key term
Wi-Fi
Wi-Fi is a technology that lets devices like laptops and phones connect to the internet or communicate with each other wirelessly using radio waves.
About these practice questions
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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.