Point-to-Point Tunneling Protocol (PPTP) is not a standard tunneling protocol. Microsoft developed PPTP, which?like L2TP?tunnels Layer 2 PPP traffic over LANs or public networks.
PPTP creates client-initiated tunnels by encapsulating packets into IP datagrams for transmission over the Internet or other TCP/IP-based networks.n a VPN, the verification of peer identity using any combination of device authentication, data origin authentication, extended authentication, and data integrity checking.
In the context of AAA, entity authentication is the method of verifying user ID, including login and password, challenge and response, messaging support, and?depending on the security protocol that is selected?encryption.
