Internet protocol security provides authentication and encryption, and can be used in conjunction with L2TP or by itself as a VPN solution. IPSec: Can encrypt any traffic supported by the IP protocol. Requires either digital certificates or pre-shared keys. Includes two protocols that provide different features.

May 29, 2020 IP Security protocols VPN uses two IPSec protocols to protect data as it flows through the VPN: Authentication Header (AH) and Encapsulating Security Payload (ESP). The other part of IPSec enablement is the Internet Key Exchange (IKE) protocol, or key management. While IPSec encrypts your data, IKE supports automated negotiation of security associations (SAs), and Supported Authentication Protocols - Windows 7 Tutorial Supported Authentication Protocols. The following authentication protocols are supported for logon security for VPN connections in Windows 7: PAP Stands for Password Authentication Protocol; uses plaintext (unencrypted) passwords.; CHAP Stands for Challenge Handshake Authentication Protocol; uses one-way MD5 hashing with challenge-response authentication. Windows 10 VPN failed to authenticate - Spiceworks

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