VPN Protocols (cont d.) Layer 2 Tunneling Protocol (L2TP) Encapsulates PPP packets to be sent over IP network connections Started as a combination of PPTP and Layer 2 Forwarding (L2F) tunneling protocols IPSec provides encryption for L2TP connections L2TP can be used with TCP/IPv4 and TCP/IPv6 networks Secure Socket Tunneling Protocol (SSTP) Allows IP-based networks to deliver traffic through firewalls that would otherwise block PPTP and L2TP MCTS Guide to Microsoft Windows 711
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