The most common VPN protocols used in the industry are PPTP, L2TP, IPsec, SSL, and OpenVPN. PPTP is the oldest protocol and is widely supported, but it is not considered secure. L2TP is more secure than PPTP but is slower. IPsec is a suite of protocols that provides strong security but can be complex to configure. SSL is a web-based VPN protocol that is easy to use and provides good security. OpenVPN is an open-source VPN protocol that is highly configurable and provides excellent security.
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