# Test Targets To gauge the quality of a user's broadband connection, our Device Agents need to measure network performance from a device, e.g., a router in a user's home or office, to a target on the internet, and vice versa. Customers can deploy their own test servers within their network for use as test targets, which are called “on-net” test servers. We also maintain a variety of high-capacity test servers across the globe as “off-net” test servers. When a test is initiated to an off-net test server, our backend provides a list of candidate test servers to the Device Agent, and the Device Agent determines the best server to use via a short latency check to each. No measurement data is stored on the test servers (on-net and off-net), only the Device Agent; the servers simply act as endpoints to generate and receive traffic. Find out more about our [server methodology](https://docs.thousandeyes.com/product-documentation/connected-devices/test-management/test-targets/test-server-methodology). ## Real applications and content providers Device Agents also perform measurements against real applications and content providers. These include services for video streaming, gaming, CDNs, websites, social media, voice over IP and video conferencing services. See [Tests](https://docs.thousandeyes.com/product-documentation/connected-devices/connected-devices-tests) for more information about these test types. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.thousandeyes.com/product-documentation/connected-devices/test-management/test-targets.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.