| Term | Description |
| L2TP | L2TP (Layer Two Tunneling Protocol) is a tunneling protocol used by ISPs to enable the operation of VPN (Virtual Private Network) over the Internet. L2TP merges the best features of two other tunneling protocols: PPTP from Microsoft and L2F from Cisco Systems. Like PPTP, L2TP requires that the ISP's routers support the protocol. |