What type of network device is primarily responsible for directing traffic between different networks?

The correct answer is a router, which plays a crucial role in directing traffic between different networks. A router operates at the network layer of the OSI model and is responsible for forwarding data packets from one network to another, ensuring that they reach their intended destination. This is accomplished through routing tables and protocols that help determine the best path for data to take across multiple networks.

Routers can connect multiple local area networks (LANs) or a LAN to a wide area network (WAN), enabling communication between devices on different networks. Additionally, they perform tasks such as network address translation (NAT) and firewall functions, which enhance security and manage the flow of data even further.

In contrast, switches operate primarily within a single network or LAN, directing traffic between devices within that local network rather than between distinct networks. Hubs are basic devices that connect multiple Ethernet devices, but they do not direct traffic; they simply broadcast incoming data packets to all connected devices. Bridges connect two or more segments of the same network, reducing collisions and increasing efficiency but without the capability to route traffic between entirely different networks.