Abstarct: Wireless communication deals with data transmission over air as interfacing medium between the transmitting and receiving stations posing data security as biggest challenge. Although, technologies other than wireless introduced earlier pay significant service to users, the broadband wireless, with mobility is the first choice of people all over. In this, WiMAX 802.16e is one possibly technology supporting data security. It uses different authentication and authorization protocols between the client and agent. This paper describes strategy of WiMAX and security mechanisms used in it. Keywords: WiMAX, DSN, AAA, WWAN, WBA I. Introduction In this era of scientific and technical growth, effective communication is a major concerned issue. Therefore it is mandatory to discuss about the latest communication technology. Wireless technology has taken vast coverage over wired communication technology. Wireless means transmitting signals using radio waves as the medium instead of wires. Wireless technologies are used for tasks as simple as switching off the television or as complex as supplying the sales force with information from an automated enterprise application. Examples today include cordless keyboards and mice, PDAs, pagers and digital and cellular phones and many more. Wireless technology provides numerous advantages which make it attractive for the users which include mobility, reachability, simplicity, maintainability, roaming services, new smart services such as SMS and MMS and many more. Wireless technologies are classified depending on their ranges and are designed to serve a specific usage segment that includesa variety of variables including bandwidth requirements, distance needs and power. The classifications include Wireless Wide Area Network (WWAN), Wireless Personal Area Network (WPAN), Wireless Local Area Network (WLAN), Wireless Metropolitan Area Network (WMAN), etc. all these networks are region specific and differ in terms of speed and range. However, though comprising of proliferate inherent features and advantages, wireless networks suffer three major issues i.e. Quality of Service (QoS), Security risk and reachable range. QoS involve interference to service due to atmospheric imbalance and lost packets of data during transfer. Security risks involve security to data transfer over wide area. Security mechanisms like the Service Set Identifier (SSID) and Wireless Equivalency Privacy (WEP) may be adequate for residences and small businesses but they are inadequate for entities that require stronger security. Reachable range is not so a major issue as it is extended to tens of miles today. Wireless Broadband Access (WBA) is a technology that ensures high speed connection over the air. It uses radio waves to transmit and receive data directly to and from the potential users. This technology includes 3G, Wi-Fi, WiMAX.WBA is a point to multipoint system in which the base station uses an outdoor antenna to send and receive high-speed data. II. Competing Technologies Within the marketplace, WiMAX's main competition came from widely deployed wireless systems such as Universal Mobile Telecommunications System (UMTS), CDMA2000, existing Wi-Fi and mesh networking. In the future, competition will be from the evolution of the major cellular standards to so-called 4G, high-bandwidth, low-latency, all-IP networks with voice services built on top. The worldwide move to 4G for GSM/UMTS and AMPS/TIA (including CDMA2000) is the 3GPP Long Term Evolution (LTE) effort.