Wireless Local-Area Network (WLAN) is a LAN communication technology in which radio, microwave or infrared links take the place of physical cables. The 802.11 family of standards issued by the IEEE provides various specifications covering transmission speeds from 1 Mbps to 54 Mbps. The four main physical-layer standards are 802.11a, 802.11b, 802.11g and 802.11n.