In the context ofDesigning and Implementing Enterprise Network Assurance (300-445 ENNA), measuring the "lived experience" of an end-user requires data collection from the actual device being used to access the services. Unlike server-side or infrastructure-side monitoring, user experience (UX) monitoring must account for local variables like Wi-Fi signal quality, CPU/memory usage, and browser-level pe21rformance.

TheEndpoint Agent(Option D) is the correct choice for this architecture. It is a lightweight software service installed directly on Windows or macOS workstations, as well as RoomOS devices. The Endpoint Agent provides a dual-monitoring approach:Real User Monitoring (RUM)andScheduled Synthetic Tests.24RUM captures actual browser sessions to SaaS (e.g., Salesforce, Microsoft 365) or internal apps, providing a "Experience Score" and a detailed waterfall view of page load components.25Simultaneously, the agent can run background synthetic network tests to measure latency and path visualization from the user's specific location, whether they are in a branch office, at home on a VPN, or in a coffee shop.

Comparing other agents:

Enterprise Agents (Option B)can simulate a user at a branch office, but they cannot provide insight into the specific health of an individual's laptop or their unique Wi-Fi environment.

Cloud Agents (Option C)are entirely outside the user's network and cannot measure the performance of internal web applications or the "last mile" connectivity of the employee.

Synthetic Agent (Option A)remains a distractor term.

By deployingEndpoint Agents, the architect ensures they have granular, contextual data that correlates application performance directly with the user’s device and local network environment.