Which statement best describes the primary function of a router in a network?

• A. Provides end-user storage for files
• B. Allows network segments and broadcast domains to communicate with each other
• C. Converts analog signals to digital
• D. Only filters traffic at the network edge

Answer: (B)

Routers operate at the network layer to connect different IP networks and determine the best path for data to travel between them. Their primary role is to forward packets between network segments, enabling devices on separate subnets to communicate with one another. Because each interface on a router sits in its own network, routers inherently create separate broadcast domains; they don’t forward broadcasts from one subnet to another by default, but they do enable communication across those networks by routing unicast traffic to the correct destination.

That’s why this statement best captures the router’s main function: it links network segments and allows communication across different broadcast domains. The other options describe functions that aren’t the router’s core purpose—storage is for file sharing, converting analog to digital is a job for a modem, and while routers can filter traffic, filtering isn’t their primary role.