Final answer:
A Traffic Manager uses the closest DNS server to direct user traffic to globally distributed endpoints, optimizing speed and reliability.
Step-by-step explanation:
The technology that uses the DNS server that's closest to the user to direct user traffic to a globally distributed endpoint is known as a Traffic Manager.
Traffic Managers are designed to enhance the speed and reliability of web services by distributing network traffic across multiple servers, potentially located across different data centers around the world. They use the DNS server closest to the user to select the best endpoint, ensuring faster response times and higher availability.