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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What does VPN stand for and how does it relate to IPSec?
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Can you explain how encryption works in IPSec?
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What are the differences between the main IPSec protocols?