In Riverbed AppResponse, User Response Time is a comprehensive metric that measures the total time a user waits for a transaction to complete. It is calculated by summing the time spent in five distinct phases of the client-server interaction. These phases are: the initial TCP connection establishment, the transfer of the client's request, the server's processing or "think" time, the transfer of the server's response, and any additional time incurred due to network packet loss and subsequent retransmissions. This decomposition allows administrators to pinpoint the exact source of performance degradation, whether it lies in the network, the server, or the data transfer process itself.

A. "Outbound Round Trip Time" is not the correct term. The specific metric for the initial TCP handshake is "Connection Setup Time".

C. "Inbound Round Trip Time" is incorrect. AppResponse uses the more precise "Connection Setup Time" for the initial handshake phase.

D. This option incorrectly includes "Inbound" and "Outbound" Round Trip Times and omits critical components like "Response Payload Transfer Time".

1. Riverbed AppResponse 11.12.1 User's Guide: In the section "Web Response Time Metrics," the guide defines the components of web page performance. It explicitly states that User Response Time is composed of several metrics, which align with the components listed in the correct answer. Specifically, it details the breakdown into connection setup, request transfer, server response, response transfer, and retransmission delays. (See Chapter: "Using Insights," Section: "Web Response Time Metrics").

2. Riverbed Support Knowledge Base Article S27885: This article, titled "Defining AppResponse 11 Web Response Time Metrics," provides a detailed breakdown of how User Response Time is calculated. It confirms the five components are: Connection Setup Time (CST), Request Payload Transfer Time (RPTT), Server Response Time (SRT), Response Payload Transfer Time (RSPTT), and Total Retransmission Delay (TRD). The article clarifies that User Response Time = CST + RPTT + SRT + RSPTT + TRD.