220-1102 Question 700
Single answerFrequencyA technician is troubleshooting unstable wireless connectivity in a small office. Users report that video calls drop and file transfers slow down whenever several employees are in the conference room. The office uses a dual-band wireless router, and the technician discovers that most employee laptops are connected to the 2.4 GHz band. Which action is the BEST way to reduce frequency-related interference and improve performance for these users?
- A
Move affected laptops to the 5 GHz band because it typically has more non-overlapping channels and less interference
- B
Change all wireless clients to Bluetooth because it uses shorter-range frequencies
- C
Lower the screen refresh rate on employee laptops to reduce wireless frequency congestion
- D
Disable WPA2 encryption so the router can transmit with less overhead
Show answer and explanation
Correct answer: A
Explanation
This question focuses on applying knowledge of wireless frequency bands in a practical support scenario. In A+ Core 2 objectives, technicians are expected to understand common wireless technologies and how frequency affects performance. The 2.4 GHz band has longer range but is more prone to interference because many devices share that spectrum and there are fewer non-overlapping channels. The 5 GHz band generally provides better performance in dense office environments, although with somewhat reduced range. Best practice is to move bandwidth-sensitive clients, such as laptops used for conferencing, to 5 GHz when available and supported. This aligns with standard wireless deployment guidance from major vendors and IEEE 802.11 implementation practices.
- A. Correct.
Correct. In real-world office environments, the 2.4 GHz band is often crowded by neighboring Wi-Fi networks, Bluetooth devices, cordless phones, and microwaves. Moving capable devices to 5 GHz is a common best practice because 5 GHz generally offers more non-overlapping channels and experiences less interference, improving throughput and stability for activities like video conferencing and file transfers.
- B. Incorrect.
Incorrect. Bluetooth is not a replacement for office Wi-Fi networking in this scenario. It is designed for short-range peripheral and personal-area connections, not general LAN access for laptops performing video calls and file transfers. Also, Bluetooth itself commonly operates in the 2.4 GHz range, so this would not address the congestion problem effectively.
- C. Incorrect.
Incorrect. Screen refresh rate is unrelated to Wi-Fi radio frequency congestion. A candidate might choose this if confusing display frequency with wireless frequency, but monitor settings do not reduce radio interference or improve wireless channel utilization.
- D. Incorrect.
Incorrect. Disabling WPA2 would reduce security and is not an appropriate troubleshooting step for RF interference. While encryption adds some processing overhead, it is not the cause of frequency congestion in a typical modern office network. Security best practices require maintaining proper wireless encryption.