Layer 2 Tunneling Protocol (L2TP)
Layer 2 Tunneling Protocol (L2TP) is an older protocol largely replaced by IPSec and SSL/TLS-based VPNs in production environments; however, you will still encounter references to the protocol in current VPN literature. It may still be in use in some older environments, where backward compatibility could still be an issue. L2TP was used extensively in early VPN solutions, but it lost its popularity as other protocols proved to be more usable as industry standards developed.
L2TP is a combination of the best features of Point-to-Point Tunneling Protocol (PPTP), a Microsoft proprietary protocol, and the Layer 2 Forwarding (L2F) Protocol, which was an early competing protocol for PPTP, developed by Cisco Systems. ...
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