CompTIA Network+ (N10-009)Network TroubleshootingMedium
A network administrator is investigating reports of intermittent connectivity and slow speeds on a wireless network operating in the 2.4 GHz band. A Wi-Fi analyzer shows high channel utilization and several access points (APs) from neighboring businesses broadcasting on channels 1, 6, and 11. The administrator's own APs are also using channels 1, 6, and 11. Which of the following actions should the administrator take FIRST to mitigate the issue?
- AIncrease the transmit power of the organization's access points.
- BMigrate all wireless devices to the 5 GHz band.
- CReconfigure the organization's APs to use channels 3, 7, and 12.
- DConduct a site survey to identify less congested 2.4 GHz channels.
Show answer & explanationAnswer & explanation
Correct answer: D. Conduct a site survey to identify less congested 2.4 GHz channels.
The problem describes channel congestion in the 2.4 GHz band, with existing APs and neighboring APs using the standard non-overlapping channels (1, 6, 11). Before making changes, a site survey will help identify if there are any other less congested channels or to confirm if 1, 6, and 11 are truly the only viable options, or if changes in AP placement could improve signal-to-noise ratio. Using overlapping channels like 3, 7, and 12 would worsen interference.
Why the other options are wrong
- A. Increasing transmit power would exacerbate interference with neighboring networks and worsen the problem, not mitigate it.
- B. While migrating to 5 GHz is a good long-term solution, it's not always feasible for all devices and doesn't address the immediate 2.4 GHz issue. The question asks for the FIRST action.
- C. Channels 3, 7, and 12 are overlapping channels in the 2.4 GHz band and would cause significant interference, making the problem worse.
Wi-Fi Site Survey
A process of planning and designing a wireless network to provide adequate coverage, data rates, and network capacity.
- Identifies sources of interference and optimal AP placement.
- Measures signal strength, noise, and channel utilization.
- Essential for troubleshooting and optimizing Wi-Fi performance.
Memory trick: When Wi-Fi gets noisy, you need to 'listen' first.