What is the difference between a switch and a router?

A conventional Ethernet switch forwards frames within a network using learned MAC address information. A router forwards packets between IP networks according to routes and policy. A home device may combine routing, switching, wireless access, and firewall functions, which can blur product names. Multilayer switches can also route, so describe the function rather than relying on the chassis label. When troubleshooting, identify whether the failure concerns local link connectivity, address resolution, routing, or a higher-level service before replacing hardware or changing configuration.