Virtual private networks are mostly think to have very high security for data communications. secure VPN provide both network authentication and encryption. Secure VPN are most commonly implemented using IPsec or SSL. because ipsec is provide very high power full security. ipsec encrypt data in algorithm . when user communicate source to destination.
IPsec has been the traditional choice for implementing VPN security on corporate networks. because unauthorized person can't enter if we are configured ipsec service. Enterprise-class network appliances from companies like Cisco and Juniper implement the essential VPN server functions in hardware. Corresponding VPN client software is then used to log on to the network. IPsec operates at the Network layer.
Virtual private networks SSL are an Optional to IPsec that reliable on a Web browser in place of tradition of VPN clients to log on to the private network. By utilizing the SSL network protocols built into standard Web browsers and Web servers, SSL VPNs are idea to be cheaper to set up and maintain than IPsec VPNs. Furthermore, SSL operates at a higher level than IPsec, giving administrators more options to control access to network resources. However, configuring SSL VPNs to interface with resources not normally accessed from a Web browser can be difficult.
Some organizations use an IPsec and some time ssl VPN to protect a Wi-Fi local area network. In reality, Wi-Fi security protocols like WPA2 and WPA-AES are As according to the line to support the necessary authentication and encryption without the need for any VPN support.
Source: http://compnetworking.about.com/od/vpn/f/vpn-security.htm
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