N10-009 Network Implementation Practice Question
A network engineer is configuring a new wireless deployment in a warehouse with hundreds of metal racks. Users report intermittent connectivity and slow throughput when walking between aisles. The engineer decides to perform a site survey and adjust the wireless design. Which of the following should the engineer implement to improve coverage and reduce interference in this environment?
⚠ Common exam trap
The trap here is assuming that increasing transmit power or using the same channel will solve coverage issues, when in fact they often worsen interference and do not address physical obstructions.
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
✓
Deploy directional antennas and perform a site survey to adjust AP placement and channel assignments.
In a warehouse with metal racks, signal reflection, absorption, and interference are major challenges. Directional antennas can focus coverage down aisles, and a thorough site survey ensures proper AP placement and channel reuse. This combination minimizes dead zones and co-channel interference, directly improving coverage and throughput for users moving between aisles.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Configure all access points to use the same channel to simplify roaming.
Why it's wrong here
Using the same channel on all access points causes co-channel interference, which severely degrades performance in a metal-rich warehouse. It does not simplify roaming; roaming is handled by client drivers and controller settings. This would worsen the intermittent connectivity and slow throughput, so it is not an appropriate solution.
- ✗
Increase the transmit power on all access points to maximum to penetrate the metal racks.
Why it's wrong here
Increasing transmit power can cause interference and does not effectively penetrate metal racks; it may also create sticky client issues. Higher power can increase the noise floor and worsen performance for nearby clients. This does not address the root cause of coverage holes and interference, so it is not the best solution.
- ✗
Enable 802.11ax on all access points and disable 2.4 GHz to reduce interference.
Why it's wrong here
While 802.11ax improves efficiency, disabling 2.4 GHz may reduce coverage because 5 GHz signals attenuate faster and may not penetrate metal obstructions well. The primary issue is placement and antenna selection, not the protocol. This change alone would not solve the intermittent connectivity and slow throughput.
- ✓
Deploy directional antennas and perform a site survey to adjust AP placement and channel assignments.
Why this is correct
Directional antennas focus signal down aisles, overcoming metal rack obstructions, while a site survey identifies dead zones and interference. Adjusting AP placement and channel assignments reduces co-channel interference. This combination directly addresses coverage and interference in a warehouse environment, making it the correct approach.
Go deeper
Related to this question
Learn chapter
Wireless Standards and Configuration
Key term
CAN
A CAN (Controller Area Network) is a robust vehicle bus standard designed to allow microcontrollers and devices to communicate with each other without a host computer.
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.
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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
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