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PPTP (Point-to-Point Tunneling Protocol) uses: * TCP port 1723 for control and session initiation * GRE (Generic Routing Encapsulation) protocol (protocol number 47) for tunneling No UDP port is used by PPTP. Evaluation: * A. TCP 1721 ##Invalid port * B. UDP 1723 ##Incorrect protocol (TCP is used, not UDP) * C.#TCP 1723 # Correct * D.#Invalid (wrong protocol and port) MTCNA Tunneling Section - PPTP Overview: "PPTP uses TCP port 1723 for control and GRE protocol for tunneling traffic." Rene Meneses MTCNA Guide - PPTP Characteristics: "PPTP = TCP/1723 + GRE (not a port, but a protocol). Allow both on firewall." Terry Combs Notes - VPN Protocol Reference: "PPTP: TCP 1723. GRE must be permitted for tunnel data."