ZDX application scoring aggregates the user experience observed during the selected time period. The tested calculation uses each user's lowest experienced value for that application, then averages those lowest values across the users who accessed it. This prevents a brief severe degradation from being hidden by otherwise healthy samples. Option A (Zscaler takes all the users that accessed the application for the selected time period and finds the lowest value each user would have experienced for the application. The lowest values for each user are added together and divided by the number of users) is correct because it describes the user-based lowest-value aggregation model.
Why the other options are incorrect:
B. Zscaler considers a single user that accessed the application for the selected time period and finds the lowest value that user would have experienced for the application. The lowest values for that user are added together and divided by the number of all users in the organization: This only considers one user, then divides by all users, which would distort the application score. ZDX computes the app score from all users who accessed the app in the selected period.
C. Zscaler takes sample set of users that accessed the application for the selected time period and finds the lowest value each user would have experienced for the application. The lowest values for each user are added together and divided by the number of sample set of users: A sample set could miss users with poor experience. The tested ZDX calculation uses all users who accessed the application, then averages their lowest experienced values.
D. Zscaler takes the lowest value for each application for a set of users, for time intervals based on the selected time range. The application with the lowest value represents your applications score for that time interval: This shifts the calculation from users to applications. ZDX application score is based on users’ lowest experience for that application, not on picking the lowest application across a set.
