Which VPN protocols can you manually configure in macOS System Settings?

According to the Apple Support website, you can manually configure a VPN connection on your Mac by choosing one of the following VPN protocols: L2TP over IPSec, Cisco IPSec, or IKEv2. L2TP (Layer 2 Tunneling Protocol) is an extension of PPTP (Point-to-Point Tunneling Protocol) used by internet service providers to enable a VPN over the internet. IPSec (Internet Protocol Security) is a set of security protocols. IKEv2 (Internet Key Exchange) is a protocol that sets up a security association in IPSec. The other options, SSTP, Wireguard, and OpenVPN, are not supported by macOS System Settings, and require third-party software to use. References: 1 Set up a VPN connection on Mac - Apple Support