PPTP (Point-to-Point Tunneling Protocol)

A tunneling protocol that operates at the Data Link

Layer (Layer 2) of the OSI Reference Model. PPTP is a proprietary technique that encapsulates Point-to-Point Protocol (PPP) frames in Internet Protocol (IP) packets using the Generic Routing Encapsulation (GRE) protocol. Packet filters provide access control, end-to-end and server-to-server. PPTP was initially conceived by Ascend, developed by Microsoft, and described in IETF RFC 2637. See also Data Link Layer, frame, GRE, IETF, IP, IPsec, L2TP, OSI Reference Model, packet, PPP, protocol, server, SOCKS, and tunneling.

• churning
• CIC (Carrier Identification Code)
• CIC (Carrier Identification Code)
• CIDR (Classless Inter-Domain Routing)
• CIDR (Classless Inter-Domain Routing)
• CIF (Common Intermediate Format)
• CI II (Computer Inquiry II)
• CIP (Classical IP over ATM)
• cipher
• CIR (Committed Information Rate)
• circuit
• circuit switch
• circuit-switched data (CSD)
• circuit-switched network
• circuit terminating equipment
• Citizens Band (CB)
• cladding
• Clarke orbit
• Clarke, Sir Arthur C. (1917–)
• Class 1
• Class 1
• Class 2
• Class 2
• Class 3
• Class 4