An engineer must run a Client Traffic Stream Metrics report in Cisco Prime Infrastructure. Which task must be run before the report?

The "Client Traffic Stream Metrics" report in Cisco Prime Infrastructure is designed to analyze the quality of real-time application traffic, such as voice and video, for a specific client. This report relies on detailed performance metrics collected from the wireless network, including Received Signal Strength Indicator (RSSI), Signal-to-Noise Ratio (SNR), packet loss, and jitter. These metrics are direct indicators of the radio frequency (RF) environment and the performance of the radio link between the client and the access point. Therefore, the underlying task of collecting and processing radio performance data is a prerequisite for generating a meaningful Client Traffic Stream Metrics report.

A. scheduled report: This is a method of executing a report at a specific time, not a prerequisite data collection task needed to populate the report.
C. client status: This is too general. The report requires specific RF performance metrics, not just basic status information like whether the client is associated or authenticated.
D. software: This is incorrect. The report is concerned with the real-time performance of a client's traffic stream, not the software versions of network components.

1. Cisco Prime Infrastructure 3.8 User Guide, "Client 360° View": The Client 360° View, which provides the data for client-specific reports, includes a dedicated "RF" tab. This tab displays critical radio performance metrics such as "RSSI, SNR, and the data rates over time." This confirms that radio performance data is the foundation for client-centric performance analysis.

2. Cisco Prime Infrastructure 3.8 User Guide, "Reports > Predefined Reports > Client Reports": This section lists the "Client Traffic Stream Metrics Report." The purpose of this report is to display metrics like packet loss and jitter for media streams. These metrics are collected via the Media Stream feature on the Wireless LAN Controller, which is a specialized function for monitoring radio performance for real-time traffic.

3. Cisco Wireless LAN Controller (WLC) Configuration Guide, Release 8.5, "Configuring Media Stream": This guide explains that enabling Media Stream (formerly TSM - Traffic Stream Metrics) is necessary to "monitor the quality of the data traffic, especially voice and video streams, on the WLAN." The metrics gathered (e.g., packet loss, delay) are fundamentally tied to the performance of the radio link.