IKE is a standard key management protocol used to create VPN tunnels. What is true about IKE ' s role with the symmetric key used for encrypting and decrypting data in the VPN tunnel?
A.
To send the symmetric key from the responder to the initiator of the VPN tunnel.
B.
To ensure that both sides have a unique symmetric key that conforms to the IKE standards.
C.
To produce a symmetric key on both sides of the tunnel.
D.
To send the symmetric key from the initiator to the responder of the VPN tunnel.
The correct answer is C. Check Point’s R82 Site-to-Site VPN documentation states that the goal of Internet Key Exchange is for both VPN peers to independently produce the same symmetric key. That key is then used to encrypt and decrypt the IP traffic carried through the VPN tunnel. IKE does not transmit the finished symmetric encryption key from the initiator to the responder or from the responder to the initiator. Instead, Diffie-Hellman exchanges key-building material so that both peers can derive the same shared secret independently. This is why options A and D are incorrect. Option B is also incorrect because the two sides do not maintain different “unique” symmetric keys for the same SA. The defining behavior is that both sides independently derive matching symmetric key material, making C the precise answer.
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