Exam CISSP-ISSAP topic 2 question 5 discussion

Extensible Authentication Protocol (EAP) In addition to older and less-secure password-based authentication methods (which should be avoided), the built-in VPN solution uses Extensible Authentication Protocol (EAP) to provide secure authentication using both user name and password, and certificate-based methods.

The protocol that provides certificate-based authentication for virtual private networks (VPNs) is: C. HTTPS (Hypertext Transfer Protocol Secure) HTTPS is commonly used for secure communication over the Internet, and it utilizes certificates for authentication. While other protocols like PPTP, SMTP, and L2TP are used for various purposes, HTTPS is specifically associated with secure web communication and often used in VPNs for certificate-based authentication.

D. L2TP