Which IPsec security mechanism ensures that if a hacker gains access to a session key, that person cannot maintain access to that session indefinitely?

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Which IPsec security mechanism ensures that if a hacker gains access to a session key, that person cannot maintain access to that session indefinitely?

Replay detection
Periodic rekey
Perfect forward secrecy
Encapsulating Security Payload

Explanation: Perfect forward secrecy ensures that new session keys are derived independently of a previous key to ensure that the compromise of one key does not mean compro-mise of future keys.

Exam with this question: CCNPv8 ENARSI Chapter 20: Do I Know This Already? Quiz Answers