Tunneling Protocols
The tunneling protocol is the specific technology that defines how data is encapsulated, transmitted, and unencapsulated across a VPN connection. Varying implementations of tunneling protocols exist and correspond with different layers of the Open System Interconnection (OSI) standards-based reference model. The OSI model is composed of seven layers, and VPN tunneling protocols use either Layer 2 or Layer 3 as their unit of exchange. Layer 2, a more fundamental network layer, uses a frame as the unit of exchange, and Layer 3 protocols use a packet as a unit of exchange.
The most common Layer 2 VPN protocols are the Point-to-Point Tunneling Protocol (PPTP) and the Layer 2 Tunneling Protocol (L2TP), both of which are fully supported ...
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