PPTP is a network protocol that enables the secure transfer of data from a remote client to a private enterprise server, creating a VPN by using standard TCP/IP-based data networks. PPTP supports multiple network protocols (IP, IPX, and NetBEUI) and can be used for virtual private networking over public and private networks.
L2TP works very similar to PPTP. It is derived from PPTP and Cisco's Layer 2 Forwarding (L2F) protocol.
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