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Secure VPN protocols include:
1. OpenVPN – This is a robust and highly configurable open-source VPN protocol. It’s widely considered to be one of the most secure protocols and supports a variety of cryptographic algorithms.
2. IKEv2/IPSec – Internet Key Exchange version 2 combined with Internet Protocol Security is known for its stability and security. It is particularly good for mobile devices due to its ability to automatically re-establish a VPN connection when the user’s device switches networks or temporarily loses its internet connection.
3. WireGuard – A relatively new protocol that is gaining popularity for its simplicity and high-speed performance. WireGuard aims to be more secure, more efficient, and easier to use than IPSec. It also aims to perform significantly faster than OpenVPN.
4. SSTP (Secure Socket Tunneling Protocol) – SSTP is fully integrated with Microsoft operating systems and offers a high level of security. It uses SSL/TLS for key exchange and is capable of passing through most firewalls and proxy servers.
5. L2TP/IPSec (Layer 2 Tunneling Protocol with Internet Protocol Security) – L2TP alone does not offer encryption; it is often implemented with the IPsec encryption suite to provide security and privacy. This combination is widely supported by most modern VPN services.
Each of these protocols has its own strengths and weaknesses, and the choice of protocol can depend on the specific requirements of the user, including the desired balance between speed and security, the types of devices being used,
D. Both B and C