350-401 Question 25
Select 2A retail company is designing a wireless LAN (WLAN) to enable location services for customer tracking and analytics in their stores. They require accurate location tracking with minimal hardware investment. Which design considerations should they prioritize to optimize location accuracy in this WLAN deployment?
- A
Deploy access points (APs) at a high density to ensure overlapping coverage and better triangulation.
- B
Position access points at ceiling height to avoid obstructions and provide consistent signal coverage.
- C
Enable 5 GHz frequency band only to avoid interference from non-Wi-Fi devices.
- D
Ensure at least three access points have overlapping coverage in key areas to improve triangulation accuracy.
- E
Utilize dedicated location-enabled access points instead of relying on existing APs for location tracking.
Show answer and explanation
Correct answers: A, D
Explanation
For WLANs designed to support location services, accurate location tracking depends on deploying a high density of access points and ensuring overlapping coverage, especially in key areas requiring precise tracking. Triangulation relies on signals from at least three APs, making these considerations essential for optimizing location accuracy while balancing hardware costs.
- A. Correct.
Deploying a high density of APs improves location accuracy by ensuring better triangulation through overlapping signal coverage. This is a best practice for WLANs with location services.
- B. Incorrect.
Positioning APs at ceiling height does help with general signal coverage, but it does not directly improve location accuracy since it doesn’t address triangulation or signal overlap.
- C. Incorrect.
Using only the 5 GHz band may reduce interference, but location services benefit from using both 2.4 GHz and 5 GHz bands to increase the number of signals available for accurate location determination.
- D. Correct.
Having at least three overlapping APs in key areas is critical for triangulation, which is the basis of accurate location tracking in WLAN designs.
- E. Incorrect.
Dedicated location-enabled APs can improve location accuracy but are costlier and not always necessary. Existing APs can often provide sufficient accuracy if the deployment is optimized.