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Which phase of the IKE process uses a previously negotiated security association (SA) to encrypt and authenticate?
Correct Answer: B
Explanation: Explanations:In phase 2, the SA (Security association) negotiated in phase 1 is used by the peers to negotiate an SA for encrypting the IPSEC traffic. Keys can be modified as often as required during a connection lifetime by performing phase 2. Phase 2 provides additional security by refreshing the keys to ensure the reliability of the SA's and prevent a man-in-the-middle-attack.See Page 7.14 of CCSE NG Official Courseware. (VPN1-FW1 Management II NG FP-1).