Companies that need lots of AP for large-area coverage often use independent AP. All APs are connected via Ethernet to a separate WLAN firewall.
The wireless router is often used in the SOHO environment. In this environment, one AP is enough. In this condition, the wireless router that integrates the broadband access router and the AP provides a single machine solution that is easier to manage and less expensive than two separate machines. The wireless router typically includes a network address translation (NAT) protocol to support network connection sharing for wireless LAN users - a useful feature in SOHO environments. They may also have a basic firewall or packet filter to prevent port scanning software and other attacks against broadband connections. Finally, most wireless routers include a four-port Ethernet converter that can connect several wired PCs. This is very convenient for managing a router or connecting a printer to a local area network.