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220-1201 Practice Question: A small office uses a legacy 2.4 GHz wireless b/g…
A small office uses a legacy 2.4 GHz wireless b/g router. Employees report frequent disconnects and slow speeds, especially when the microwave is used in the break room. Which change would most directly reduce interference in this scenario?
⚠ Common exam trap
CompTIA A+ exams often test the misconception that changing channels or increasing power can solve interference from non-Wi-Fi sources, when in fact the only effective solution is to move to a different frequency band (5 GHz) that is not affected by the interferer.
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
✓
Upgrade to a dual-band router and connect clients to the 5 GHz SSID.
The legacy 2.4 GHz router operates in the same frequency band as microwave ovens, which emit broadband interference around 2.45 GHz. Upgrading to a dual-band router and moving clients to the 5 GHz SSID directly avoids this interference because 5 GHz is not affected by microwave emissions, providing a cleaner RF environment and more available channels.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Enable WPA3 encryption on the router.
Why it's wrong here
Enabling WPA3 encryption enhances the security of the wireless network by providing stronger authentication and data privacy. However, encryption operates at a higher layer of the network stack and does not mitigate physical layer electromagnetic interference (EMI) caused by external devices like microwave ovens. The problem is one of signal disruption, not unauthorized access, so a security protocol change is irrelevant to the interference issue.
- ✓
Upgrade to a dual-band router and connect clients to the 5 GHz SSID.
Why this is correct
Upgrading to a dual-band router and connecting clients to the 5 GHz SSID is the most effective solution because microwave ovens operate within the 2.4 GHz Industrial, Scientific, and Medical (ISM) band, causing significant electromagnetic interference. The 5 GHz band, conversely, operates at a much higher frequency range, making it entirely unaffected by the emissions from typical microwave ovens. This frequency separation ensures a clear and stable wireless connection, directly resolving the interference problem.
- ✗
Increase the router's transmit power to maximum.
Why it's wrong here
Increasing the router's transmit power might marginally extend range or improve signal strength in some scenarios, but it is largely ineffective against the strong, broadband electromagnetic interference generated by microwave ovens. Such powerful interference can overwhelm even a boosted Wi-Fi signal, and simply increasing power does not change the fundamental frequency overlap causing the disruption. Furthermore, excessively high transmit power can lead to increased co-channel interference for other networks and may violate regulatory limits.
- ✗
Change the 2.4 GHz channel from 6 to 11.
Why it's wrong here
Changing the 2.4 GHz channel from 6 to 11, or any other channel within the 2.4 GHz band, will not resolve interference from a microwave oven. Microwave ovens emit a wide spectrum of electromagnetic noise that typically spans across the entire 2.4 GHz ISM band, including all non-overlapping Wi-Fi channels (1, 6, and 11). Therefore, simply shifting to a different channel within the same affected frequency range will not escape the pervasive interference.
Go deeper
Related to this question
Learn chapter
Wireless Security: WEP, WPA, WPA2, WPA3
Key term
Service Set Identifier
A Service Set Identifier (SSID) is the public name of a Wi-Fi network that devices use to identify and connect to it.
Key term
Router
A router is a networking device that connects different networks together and directs data traffic between them by choosing the best path for data to travel.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 220-1201 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 220-1201 exam.