- A
Reduce the 2.4 GHz channel width to 20 MHz.
Why wrong: 20 MHz channels reduce throughput but do not eliminate interference from non-Wi-Fi sources.
- B
Implement DFS channels on the 5 GHz band.
Why wrong: DFS channels avoid radar interference but do not address 2.4 GHz noise; they are for 5 GHz.
- C
Move all critical devices to the 5 GHz band.
5 GHz is less congested and has less non-Wi-Fi interference, providing a more stable connection.
- D
Increase the transmit power on the 2.4 GHz radio.
Why wrong: Higher power can overcome interference but may cause co-channel interference and does not remove the noise source.
Question 266 of 1,020
How to Resolve 2.4 GHz Wireless Interference: Move to 5 GHz
This 220-1201 practice question tests your understanding of wireless networking technologies. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 technician is troubleshooting a wireless network where users report intermittent connectivity and slow speeds. A spectrum analyzer shows high noise levels on the 2.4 GHz band from non-Wi-Fi sources. Which of the following is the MOST effective long-term solution?
Quick Answer
The answer is to move all critical devices to the 5 GHz band, as this is the most effective long-term solution for fixing 2.4 GHz interference Wi-Fi problems. Non-Wi-Fi sources like microwaves, cordless phones, and Bluetooth devices operate on the crowded 2.4 GHz spectrum, causing high noise levels that degrade signal quality and speed. The 5 GHz band offers more non-overlapping channels and is far less congested, making it ideal for reliable, high-throughput connections. On the CompTIA A+ Core 1 220-1201 exam, this scenario tests your understanding of wireless frequency bands and interference sources—a common trap is choosing to simply change the 2.4 GHz channel, which only provides temporary relief since the interference source remains. Remember the memory tip: “2.4 is for the floor, 5 is for the drive”—meaning 2.4 GHz has better range but suffers interference, while 5 GHz is faster and cleaner for critical tasks.
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
✓
Move all critical devices to the 5 GHz band.
The 5 GHz band has significantly more non-overlapping channels and is far less congested by non-Wi-Fi interference (e.g., microwaves, Bluetooth, cordless phones) than the 2.4 GHz band. Moving critical devices to 5 GHz avoids the interference source entirely, providing a stable long-term solution without compromising throughput or reliability.
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.
- ✗
Reduce the 2.4 GHz channel width to 20 MHz.
Why it's wrong here
20 MHz channels reduce throughput but do not eliminate interference from non-Wi-Fi sources.
- ✗
Implement DFS channels on the 5 GHz band.
Why it's wrong here
DFS channels avoid radar interference but do not address 2.4 GHz noise; they are for 5 GHz.
- ✓
Move all critical devices to the 5 GHz band.
Why this is correct
5 GHz is less congested and has less non-Wi-Fi interference, providing a more stable connection.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Increase the transmit power on the 2.4 GHz radio.
Why it's wrong here
Higher power can overcome interference but may cause co-channel interference and does not remove the noise source.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CompTIA often tests the misconception that reducing channel width or increasing power can overcome interference, when in fact the most effective long-term solution is to move clients to a less congested frequency band.
Detailed technical explanation
How to think about this question
Non-Wi-Fi sources like microwave ovens (operating at ~2.45 GHz) and Bluetooth devices cause frequency-hopping interference that cannot be mitigated by channel width or power adjustments alone. The 5 GHz band (UNII-1, UNII-2, UNII-2e, UNII-3) offers up to 25 non-overlapping 20 MHz channels versus only 3 in 2.4 GHz, and is largely free from common household interference, making band steering or dual-band client prioritization the preferred enterprise approach.
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: Move all critical devices to the 5 GHz band. — The 5 GHz band has significantly more non-overlapping channels and is far less congested by non-Wi-Fi interference (e.g., microwaves, Bluetooth, cordless phones) than the 2.4 GHz band. Moving critical devices to 5 GHz avoids the interference source entirely, providing a stable long-term solution without compromising throughput or reliability.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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.
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