LAN is used to connect more than one computer with each other in a limited area network in offices, schools, and computer laboratory. Common technology is used to establish the LAN Ethernet and Wi-Fi. Client node densities approaching or surpassing those of cellular telephony can be expected because of the continuing market success of wireless LAN’s (WLAN) and integration of devices such as printers, music players, and mobile phones. Because of this usage growth there can be an increase in co-channel interference. The standard approach to alleviate inter-cell interference is careful frequency planning, that prevents neighboring cells from functioning on the same channel, transmission power control, and carrier sense tuning to increase spatial reuse. Distributed channel selection is a dynamic form of these approaches. The technique used in cellular technology can be considered for use in large WLAN systems to optimize the bandwidth.