Windows Server® 2012 Unleashed
by Rand Morimoto, Michael Noel, Guy Yardeni, Omar Droubi, Andrew Abbate, Chris Amaris
VPN Protocols
PPTP, L2TP, and SSTP are the communication standards used to manage tunnels and encapsulate private data. It is important to note that data traveling through a tunnel must also be encrypted to be a VPN connection. Windows Server 2012 includes PPTP, L2TP, and SSTP tunneling protocols.
To establish a tunnel, both the tunnel client and tunnel server must be using the same tunneling protocol. Tunneling technology can be based on either a Layer 2 or Layer 3 tunneling protocol that corresponds to the Open System Interconnection (OSI) reference model. Layer 2 protocols correspond to the Data-link layer and use frames as their unit of exchange. PPTP and L2TP are Layer 2 tunneling protocols that encapsulate the payload in a PPP frame before ...
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