PPTP
Point - to - Point Tunnelling Protocol
Point-to-Point Tunnelling Protocol is a Layer 2 protocol that encapsulates PPP (Point to Point Protocol) frames in IP datagrams for transmission, typically over the Internet. PPTP uses a TCP (Transmission Control Protocol) connection for tunnel maintenance and a modified version of GRE (Generic Routing Encapsulation) to encapsulate PPP data frames.
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