Which IP protocol is particularly suited for establishing secure tunnels over the internet, often used in conjunction with VPNs?
Generic Routing Encapsulation (GRE)
Internet Protocol Security (IPSec)
Transmission Control Protocol (TCP)
User Datagram Protocol (UDP)
IPsec is designed to securely exchange data over public networks by encrypting and authenticating IP packets. It establishes mutual authentication and negotiates cryptographic keys, making it ideal for VPN tunnels. GRE can encapsulate many protocol types inside IP tunnels but lacks inherent encryption. UDP supports fast, connectionless transmission without built-in security, while TCP provides reliable delivery but no native encryption or confidentiality mechanisms.
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