The below Network Diagram shows how firewalls, routers, switches, and wireless access points are connected to laptops and other networked computers. This Network Diagram is designed in EdrawMax and shows the importance and flow of a physical network diagram. Home or office routers combine three networking components: a router, a firewall, and a switch. In a commercial or corporate setting, the three pieces of hardware are kept separate, but consumer routers are almost always a combination of both the routing and switching components with a firewall added in for suitable measures. It should be noted here that Routers act as basic firewalls in a variety of ways, including automatically rejecting incoming data that is not part of an ongoing exchange between a computer within your network and the outside world.