Final answer:
A router offers the most advantage for setting up a firewall between your Internet communication and the workgroup switches on your network.
Step-by-step explanation:
The device that offers the most advantage for setting up a firewall between your Internet communication and the workgroup switches on your network is a router.
A router is designed to connect multiple networks together and acts as a gateway device. It can analyze the source and destination IP addresses of data packets and make decisions on where to send them based on routing tables. This allows the router to control the flow of traffic between networks and provide security features like firewall capabilities.
In the network diagram, the router is placed between the Internet and the workgroup switches. The firewall functionality is integrated into the router, providing a secure barrier between the Internet and the internal network.