A VPN protocol is a component of VPN that is used to manage tunnels and encapsulate private data. A VPN protocol defines the rules and standards for establishing and maintaining a secure connection between the VPN client and the VPN server. A VPN protocol also specifies how the data is encrypted, authenticated, and transmitted over the tunnel.Some common VPN protocols are IPSec, SSL/TLS, PPTP, L2TP, and OpenVPN12.References:Network Defense Essentials - EC-Council Learning,VPN Protocols Explained & Compared: OpenVPN, IPSec, PPTP, IKEv2
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