Question: Which VPN protocol is best for highest security and performance?

A.  PPTP

B.  L2TP

C.  OpenVPN

D.  IPsec

Correct Answer: C

Explanation:

PPTP (Point-to-Point Tunneling Protocol): This is one of the oldest VPN protocols and is generally considered insecure due to weak encryption and known vulnerabilities.

L2TP (Layer 2 Tunneling Protocol): While L2TP itself does not provide encryption, it is often used in conjunction with IPsec for encryption. Although considered more secure than PPTP, it can be slower and less flexible than OpenVPN.

OpenVPN: OpenVPN is an open-source protocol that offers high security using modern encryption algorithms like AES. It is also highly configurable and can bypass most firewalls. Its open-source nature allows for regular security audits, and it is generally considered both secure and fast.

IPsec (Internet Protocol Security): While IPsec is secure and widely supported, it can be more challenging to set up correctly compared to OpenVPN. It's often used with L2TP but can also be used in a standalone mode. IPsec is considered secure but can be slower and less flexible than OpenVPN in some implementations.