SSL ( Secure Sockets Layer) VPN : SSL is a form of VPN that can be used with a standard Web browser. IPsec (Internet Protocol Security) : IPsec is a framework for a set of protocols for security at the network or packet processing layer of network communication. L2TP ( Layer Two Tunneling Protoco) VPN : L2TP is an extension of the Point-to-Point Tunneling Protocol (PPTP) used by an Internet service provider (ISP) to enable the operation of a virtual private network over the Internet. Intranet-based site-to-site VPN is created between an organization's propriety networks, while extranet-based site-to-site VPN is used for connecting with external partner networks or an intranet. Site-to-site VPN can be intranet based or extranet based. Site-to-Site VPN : Site-to-site VPN is a type of VPN connection that is created between two separate locations. PPTP uses a control channel over TCP and a GRE tunnel operating to encapsulate PPP packets. PPTP is a method for implementing virtual private networks. PPTP ( Point to Point Tunnel protocol ) VPN : Most commonly used VPN. The following are the different types of VPNs :
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