Apple Certified Support Professional Practice Test

The correct choice is C, FTP, because it is not a VPN supported protocol in macOS. VPNs (Virtual Private Networks) use specific protocols designed for secure communication over the internet, which include methods for encrypting data and ensuring privacy. FTP, or File Transfer Protocol, is primarily used for transferring files over a network and does not include security features required for VPN functionality.

The other protocols listed—IKEv2, L2TP over IPsec, and Cisco IPsec—are designed for creating secure connections over the internet. IKEv2 (Internet Key Exchange version 2) is known for its efficiency and ability to reconnect quickly after disruptions. L2TP (Layer 2 Tunneling Protocol) combined with IPsec (Internet Protocol Security) adds a layer of security to the tunneling method. Cisco IPsec is a widely used protocol for establishing secure VPN connections, particularly in environments utilizing Cisco devices. All these protocols are recognized for providing secure communication and privacy in a VPN context, making them suitable for macOS support.