A wireless router is a very important network device that performs the same functions of a router but also includes the functions of a wireless access point. It is used to allow access to the Internet or a computer network without the need for a cabled connection. It can function in a wired LAN (local area network), a wireless only LAN, or a mixed network.The simple router connect two or more logical subnets, which do not necessarily map one-to-one to the physical interfaces of the router and while wireless router doing the same function without cables.All sizes of wireless routers may be found inside different enterprises. The most powerful wireless router tend to be found in ISPs and academic & research facilities. Large businesses may also need powerful wireless routers.Distribution routers can aggregate traffic from multiple access routers, either at the same site, or to collect the data streams from multiple sites to a major enterprise location. Distribution wireless routers often are responsible for enforcing quality of service across a Wide Area Network, so they may have considerable memory, multiple WAN interfaces, and substantial processing intelligence.A three-layer model is in common use, not all of which need be present in smaller networks because it is mostly used in wide network.Distribution routers can aggregate traffic from multiple access routers, either at the same site, or to collect the data streams from multiple sites to a major enterprise location. Distribution wireless routers often are responsible for enforcing quality of service across a Wide Area Network, so they may have considerable memory, multiple WAN interfaces, and substantial processing intelligence.Wireless router may also provide connectivity to groups of servers or to external networks. In the later application, the router’s functionality must be carefully considered as part of the overall security architecture.Large businesses may also need powerful wireless routers.Distribution routers can aggregate traffic from multiple access routers, either at the same site, or to collect the data streams from multiple sites to a major enterprise location. Distribution wireless routers often are responsible for enforcing quality of service across a Wide Area Network, so they may have considerable memory, multiple WAN interfaces, and substantial processing intelligence.A three-layer model is in common use, not all of which need be present in smaller networks because it is mostly used in wide network.