Final answer:
A router is the device that ensures each request is forwarded to the correct recipient by directing traffic on the Internet, unlike firewalls, proxy servers, and hubs which have different functions.
Step-by-step explanation:
The device responsible for making sure that each request is forwarded to its intended recipient is a router. A router is a networking device that forwards data packets between computer networks. Routers perform the traffic directing functions on the Internet by ensuring that data sent from one computer to another reaches the correct destination. They accomplish this by using headers and forwarding tables to determine the best path for transferring data packets.
Firewalls are designed to block unauthorized access while permitting outward communication, proxy servers act as intermediaries for requests from clients seeking resources from other servers, and a hub serves as a basic connection point for devices in a network but doesn't manage data traffic as routers do.