L2TP or Layer 2 Tunneling Protocol is an extension to the PPP protocol that merges the best features of two other tunneling protocols PPTP (Point-to-Point Tunneling Protocol) and L2F (Layer 2 Forwarding Protocol) and is used to support virtual private networks (VPNs).
As this protocol does not provide confidentiality or strong authentication by itself, Layer 2 Tunneling Protocol is often implemented along with the IPSec tunneling protocol to secure the connection.
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