Abstract: Now a days Wireless networks are very famous the reason is user friendliness of Wi-Fi, within 20 meters any one can connect any Wi-Fi device to network without any wire. Wi-Fi use 2.4gigahertz UHF and 5gighertz range. Mainly devices connect through wireless access points. This is the main entrance of network attackers to large scale organizations. Network security is very important in large scale organizations. Wireless security is help to prevent unauthorized access to the network via wireless access points. Increment of thousands of Wi-Fi users, need to improve wireless security. This Wi-Fi network attacks always focus on large organizations, now organizations consider about their wireless network security. The research explain how increase Wi-Fi security in large scale company networks using WPA2, WTLS, AES Encryption, IP-VPN and HTTP Proxy Servers. Research paper explain things that need to include in new protocol and discussion about the most efficient and fast way to transfer data through the wireless network in a large scale organization has been discussed.