200-301 Question 136
Select 3A network administrator is deploying a wireless network in a high-density office environment. They notice that users are experiencing poor connectivity and slow speeds. After analyzing the RF environment, the administrator observes significant co-channel interference and overlapping Wi-Fi channels. Which of the following actions could improve the RF performance of the wireless network?
- A
Reduce the transmission power of access points.
- B
Enable 40 MHz channel width in the 2.4 GHz band.
- C
Switch to non-overlapping channels in the 5 GHz band.
- D
Increase the number of access points in the same area.
- E
Disable legacy 802.11b data rates.
Show answer and explanation
Correct answers: A, C, E
Explanation
In high-density environments, reducing co-channel interference and optimizing the RF environment are critical for ensuring good wireless performance. Reducing transmission power prevents signal overlap, switching to non-overlapping 5 GHz channels reduces interference, and disabling legacy data rates increases efficiency. However, using wider channels in the 2.4 GHz band or adding more access points without planning can cause interference and degrade performance.
- A. Correct.
Reducing the transmission power of access points helps minimize co-channel interference by limiting the overlap of wireless signals between neighboring access points.
- B. Incorrect.
Enabling 40 MHz channel width in the 2.4 GHz band reduces the number of available non-overlapping channels, increasing interference and worsening performance in high-density environments.
- C. Correct.
Switching to non-overlapping channels in the 5 GHz band takes advantage of the wider range of available channels, reducing co-channel interference and improving overall performance.
- D. Incorrect.
Increasing the number of access points in the same area without proper channel planning can exacerbate co-channel interference and signal overlap, leading to worse performance.
- E. Correct.
Disabling legacy 802.11b data rates reduces airtime usage for older, slower devices, improving overall performance in high-density environments.