Which technology does FortiGate utilize to offer VPN services?

FortiGate utilizes IPsec to offer VPN services because it provides a robust and secure method for creating virtual private networks. IPsec is widely recognized for its ability to secure Internet Protocol communications by authenticating and encrypting each IP packet in a communication session. This technology is highly configurable, allowing for different modes, such as transport mode and tunnel mode, which cater to various networking scenarios and requirements.

IPsec's strength lies in its support for both site-to-site and remote-access VPNs, making it versatile for organizations with diverse connectivity needs. Additionally, it employs various cryptography mechanisms to ensure confidentiality, integrity, and authenticity of the data being transmitted over potentially insecure networks such as the internet.

Other options, while used for VPN technology, do not align with FortiGate's primary offerings. PPTP and L2TP are older protocols that lack the same level of security provided by IPsec. SSL (Secure Sockets Layer), while also utilized by FortiGate for VPN, is generally reserved for browser-based secure communications and SSL VPNs, which are distinctly different from the traditional IPsec VPN services offered by devices like FortiGate. Therefore, IPsec is the primary choice for secure and flexible VPN operations in FortiGate environments.