Go back to 642-552 - SND - Securing Cisco Network Devices Exam

Question :-

Why was the Diffie-Hellman key agreement protocol created?
to eliminate the possibility of man-in-the-middle attacks, replacing the RSA method, which is susceptible to this type of attack
a practical method for establishing a shared secret over an unprotected communications channel was needed
an iterated HMAC function to generate pseudorandom data streams was needed
to provide a scalable and secure mechanism for distributing, managing, and revoking encryption and identity information

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