The Prisma SD-WAN Application Experience (AppX) Score is a composite metric designed to provide a holistic view of end-user experience for a specific application. It is calculated by combining three distinct performance indicators. These are the Network Transfer Time (NTT), which measures the round-trip network latency; the Server Response Time (SRT), which measures the time the application server takes to process a request; and the Transaction Failure Rate, which quantifies the percentage of failed application transactions. Together, these metrics accurately represent the end-to-end performance from the client to the application server and back.

D. Bandwidth Utilization: This metric reflects the consumption of link capacity. While it can impact performance, it is not a direct input into the AppX score calculation itself.

E. Jitter: Jitter measures the variation in packet delay. It is a key metric for assessing path quality, especially for real-time traffic like VoIP, but it is not a component of the AppX score.

1. Palo Alto Networks. (2023). Prisma SD-WAN Administrator's Guide 6.2. Monitor Application Performance. "Prisma SD-WAN calculates the Application Experience (AppX) Score for an application based on the following metrics: Network Transfer Time (NTT), Server Response Time (SRT), and Transaction Failure Rate." Retrieved from https://docs.paloaltonetworks.com/prisma-sd-wan/6-2/prisma-sd-wan-admin/monitor/monitor-application-performance

2. Palo Alto Networks. (2023). Prisma SD-WAN Administrator's Guide 6.2. Monitor Application Performance > Application Health - Summary. The section details the AppX Score and explicitly lists its three components: "Network Transfer Time (NTT)", "Server Response Time (SRT)", and "Transaction Failure Rate". Retrieved from https://docs.paloaltonetworks.com/prisma-sd-wan/6-2/prisma-sd-wan-admin/monitor/monitor-application-performance/application-health-summary