350-401 Question 27
Single answerAn enterprise is designing a wireless LAN to support location-based services for asset tracking and user positioning. Which factor is MOST critical to ensure the accuracy of location services in the WLAN design?
- A
Ensuring that access points are equipped with external antennas
- B
Deploying access points in a way that provides 100% signal coverage across the area
- C
Positioning access points to create overlapping coverage from at least three APs at any given location
- D
Configuring access points to operate on non-overlapping channels to prevent interference
Show answer and explanation
Correct answer: C
Explanation
For accurate location services in a WLAN design, triangulation is a critical requirement. This involves having overlapping coverage from at least three access points at any given location. Triangulation allows the system to calculate the position of a client device based on the signal strength or time-of-flight from multiple APs. Other considerations, like reducing interference or using external antennas, can improve overall wireless performance but are not the primary factor for location accuracy.
- A. Incorrect.
While external antennas can enhance signal range and directionality, they do not directly impact the accuracy of location services. The key factor is triangulation, which requires overlapping coverage from multiple access points.
- B. Incorrect.
100% signal coverage ensures connectivity, but accurate location services require triangulation, which depends on overlapping coverage from multiple access points, not just blanket coverage.
- C. Correct.
Overlapping coverage from at least three access points is essential for triangulation, which is the technique used to determine the precise location of devices in a WLAN.
- D. Incorrect.
Non-overlapping channels help reduce interference for better performance, but this does not directly ensure the accuracy of location services, which require overlapping coverage for triangulation.