A router that connects to three subnets is called a ________ router.

• A. Border
• B. Internal
• C. Application Proxy
• D. None of the Above

Answer: (D)

A router’s job is to connect different IP networks (subnets) and forward traffic between them. Connecting three subnets doesn’t create a distinct router type; routers can interconnect many subnets. A border router describes a router at the edge of a network that connects to another network, often the Internet, and emphasizes location rather than the number of subnets. An internal router isn’t a standard designation, and an Application Proxy is a firewall function that mediates application-layer traffic, not a routing device. So there isn’t a special name for a router just because it connects three subnets—it’s simply a router, and None of the Above is the best answer.