All the provided statements are factually correct.

A: SSL VPNs leverage the SSL/TLS protocol suite, which is the same cryptographic protocol used by HTTPS to secure web traffic. In contrast, IPsec is a different protocol suite operating at the network layer, using protocols like IKE for key exchange and ESP for data encapsulation, not HTTPS.

B: Both IPsec and SSL/TLS are industry-standard protocols defined by the Internet Engineering Task Force (IETF) in various RFCs, ensuring interoperability between different vendors.

C: FortiGate devices are designed to provide flexible remote access and can terminate both SSL VPN and IPsec VPN connections from end-user workstations, often using the FortiClient application or native OS clients.

This section is not applicable as option D, "All of the above," is the correct choice, indicating that statements A, B, and C are all true.

1. Fortinet FortiOS 7.2.0 Administration Guide

"Introduction to VPN

" p. 8: "FortiOS supports two main types of VPN: IPsec and Secure Sockets Layer (SSL). Both IPsec and SSL are popular standards-based encryption protocols." This supports statement B.

2. Fortinet FortiOS 7.2.0 Administration Guide

"SSL VPN

" p. 10: "SSL VPN uses Secure Sockets Layer (SSL) encryption (also known as Transport Layer Security (TLS)) from a web browser to provide a secure remote access VPN." This confirms that SSL VPN uses the protocol underlying HTTPS

supporting statement A.

3. Fortinet FortiOS 7.2.0 Administration Guide

"IPsec VPN for remote access

" p. 10 and "SSL VPN for remote access

" p. 10: The guide explicitly details configurations for both IPsec and SSL VPNs for remote access scenarios

where end-user workstations connect to a FortiGate. This supports statement C.

4. IETF RFC 4301

"Security Architecture for the Internet Protocol": This document specifies the base architecture for IPsec

confirming its status as a standard protocol.

5. IETF RFC 8446

"The Transport Layer Security (TLS) Protocol Version 1.3": This document specifies the TLS protocol

the successor to SSL

confirming its status as a standard protocol.