Routers might have a single WAN port and a single LAN port and are designed to connect an existing LAN hub or switch to a WAN. Ethernet switches and hubs can be connected to a router with multiple PC ports to expand a LAN. ... Some routers even have USB ports, and more commonly, wireless access points built into them.
Routers are used to connect a WAN or WANS to your LAN or connect dissimilar networks together. Routers can be used to filter and isolate traffic or segment network traffic like switches. The differences of a router and switch can be confusing. ... In contrast, a switch can recognize only one path between networks.