Microsoft 70-680 MSCA Exam Prep

Answer: D - The TCP port used by a SSTP VPN tunnel is 443.

Key Takeaway: SSTP VPN tunnels use port 443, meaning that SSTP VPN traffic can pass across almost all firewalls that allow Internet access, something that is not true of the PPTP, L2TP/IPsec, and IKEv2 VPN protocols. SSTP works by encapsulating PPP traffic over the SSL channel of the HTTPS protocol. SSTP supports data origin authentication, data integrity, replay protection, and data confidentiality.