- A
The access point is overheating.
Why wrong: Overheating would likely affect all devices, not just wireless laptops, and is less common than interference.
- B
A microwave oven is operating near the access point.
Microwave ovens operate at 2.4 GHz and can cause significant interference, leading to intermittent drops on Wi-Fi but not on wired connections.
- C
The laptops have outdated Bluetooth drivers.
Why wrong: Bluetooth also uses 2.4 GHz but driver issues would not cause intermittent drops across multiple laptops consistently.
- D
The Ethernet switch is failing.
Why wrong: A failing switch would affect all devices, including desktops, and is unrelated to wireless-only issues.
Question 350 of 1,020
Why Microwaves Interfere with 2.4 GHz Wi-Fi
This 220-1201 practice question tests your understanding of wireless networking technologies. 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 small office experiences intermittent Wi-Fi drops on laptops but not on desktops connected via Ethernet. The wireless network uses 2.4 GHz. Which of the following is the MOST likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Quick Answer
The answer is a microwave oven operating near the access point. This is correct because microwave ovens emit electromagnetic radiation at approximately 2.45 GHz, which falls squarely within the 2.4 GHz Wi-Fi band, causing significant interference that leads to intermittent connectivity drops on wireless devices while wired Ethernet connections remain unaffected. On the CompTIA A+ Core 1 220-1201 exam, this scenario tests your understanding of RF interference sources and the limitations of the 2.4 GHz band, often appearing in troubleshooting questions where only wireless clients experience issues. A common trap is to blame the router or channel congestion first, but the key clue is the intermittent nature tied to appliance usage. Remember the memory tip: “Microwave matches the MHz”—if a microwave is running, your 2.4 GHz Wi-Fi is likely taking a hit.
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
✓
A microwave oven is operating near the access point.
Microwave ovens operate at approximately 2.45 GHz, which falls within the 2.4 GHz ISM band used by Wi-Fi. When a microwave is running near an access point, it generates strong electromagnetic interference that can cause intermittent signal degradation or drops, affecting wireless clients like laptops but not wired desktops.
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.
- ✗
The access point is overheating.
Why it's wrong here
Overheating would likely affect all devices, not just wireless laptops, and is less common than interference.
- ✓
A microwave oven is operating near the access point.
Why this is correct
Microwave ovens operate at 2.4 GHz and can cause significant interference, leading to intermittent drops on Wi-Fi but not on wired connections.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The laptops have outdated Bluetooth drivers.
Why it's wrong here
Bluetooth also uses 2.4 GHz but driver issues would not cause intermittent drops across multiple laptops consistently.
- ✗
The Ethernet switch is failing.
Why it's wrong here
A failing switch would affect all devices, including desktops, and is unrelated to wireless-only issues.
Common exam traps
Common exam trap: answer the scenario, not the keyword
A common pitfall in CompTIA A+ is to attribute intermittent wireless drops to driver or configuration issues, but the key clue is that only wireless clients are affected while wired desktops work fine. This points to RF interference, such as from a microwave oven operating in the 2.4 GHz band.
Detailed technical explanation
How to think about this question
The 2.4 GHz band is divided into channels (e.g., 1, 6, 11 in the US) with 22 MHz width; microwave ovens emit broadband noise across multiple channels, causing packet loss and retransmissions. In practice, this interference is often intermittent because microwaves cycle on and off (e.g., 50/60 Hz AC power), leading to periodic Wi-Fi drops that are hard to diagnose without spectrum analysis tools like a Wi-Fi analyzer.
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 220-1201 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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Wireless Networking Technologies — study guide chapter
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FAQ
Questions learners often ask
What does this 220-1201 question test?
Wireless Networking Technologies — This question tests Wireless Networking Technologies — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: A microwave oven is operating near the access point. — Microwave ovens operate at approximately 2.45 GHz, which falls within the 2.4 GHz ISM band used by Wi-Fi. When a microwave is running near an access point, it generates strong electromagnetic interference that can cause intermittent signal degradation or drops, affecting wireless clients like laptops but not wired desktops.
What should I do if I get this 220-1201 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
2 more ways this is tested on 220-1201
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A customer reports that their wireless printer stops responding when the microwave is in use. The printer is connected via Wi-Fi to a dual-band router. Which troubleshooting step should the technician take first to resolve this issue?
easy- A.Replace the printer with a wired model
- B.Change the router’s 2.4 GHz channel
- ✓ C.Connect the printer to the 5 GHz network
- D.Update the printer firmware
Why C: The microwave oven operates in the 2.4 GHz ISM band, generating broadband interference that disrupts Wi-Fi communication on that frequency. Connecting the printer to the 5 GHz network avoids this interference entirely because the 5 GHz band is not affected by microwave emissions, providing a clean channel for the printer.
Variation 2. 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?
easy- A.Enable WPA3 encryption on the router.
- ✓ B.Upgrade to a dual-band router and connect clients to the 5 GHz SSID.
- C.Increase the router's transmit power to maximum.
- D.Change the 2.4 GHz channel from 6 to 11.
Why B: 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.
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Last reviewed: Jul 4, 2026
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