GRE Tunnel Encryption: Protocol Options and Best Practices

Which Protocol Encrypts Traffic Over a GRE Tunnel?

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Which protocol can be used to encrypt traffic sent over a GRE tunnel?



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A. B. C. D. E.


The correct answer is C. IPsec.

A GRE (Generic Routing Encapsulation) tunnel is a type of VPN that encapsulates one protocol over another, allowing data to be transmitted over an insecure network in a secure manner. However, GRE does not provide encryption on its own.

To encrypt traffic sent over a GRE tunnel, an additional layer of security is needed. This is typically achieved through the use of IPsec (Internet Protocol Security), which provides encryption, authentication, and data integrity for IP packets.

IPsec can operate in two modes: transport mode and tunnel mode. In transport mode, only the payload of the IP packet is encrypted, while in tunnel mode, both the IP header and payload are encrypted. To encrypt traffic sent over a GRE tunnel, IPsec is typically configured in tunnel mode.

SSL (Secure Sockets Layer), TLS (Transport Layer Security), and SSH (Secure Shell) are all protocols used for secure communication over a network, but they are not typically used for encrypting traffic sent over a GRE tunnel.

DH (Diffie-Hellman) is a key exchange algorithm used in some cryptographic protocols, but it is not used for encrypting traffic over a GRE tunnel.