Exam 300-430 topic 1 question 210 discussion

To enable location services and accurately track clients using a Cisco Wireless LAN Controller (WLC) and Mobility Services Engine (MSE), a client must be detected by at least three access points (APs). This is because triangulation is used to determine the client's position, and at least three APs are required to calculate the client's location accurately. A. 1: A single AP cannot provide location accuracy as it only provides signal strength, not position. C. 4: While more APs can improve accuracy, three APs are the minimum required for triangulation. D. 6: This is excessive for basic location tracking and not the minimum requirement.

A minimum of three access points (and preferably four or more for optimum accuracy) should be reporting this level of signal strength or better for any device being localized https://www.cisco.com/en/US/docs/solutions/Enterprise/Mobility/emob30dg/Locatn.html