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The correct action that follows after IKE phase 2 in the IPSec process is the encryption of traffic. During IKE phase 2, also known as the Quick Mode, the security associations (SAs) for the IPSec tunnels are established. This phase involves negotiating the parameters that will be used for the actual data transfer between the peers, which includes the keys and algorithms for encryption.

Once the security association is in place, the following step is to secure data traffic, which is achieved through the encryption defined in those SAs. The encryption process ensures that the data transmitted over the IPSec tunnel is protected against eavesdropping and tampering, making it an essential component of secure communications.

In contrast, tunnel termination relates to ending a secure session rather than building it, dynamic tunnel creation refers to establishing a tunnel that can change based on conditions, and peer authentication would typically occur earlier in the phases as part of establishing trust between the communication endpoints. Therefore, the immediate next action after IKE phase 2 is effectively the encryption of traffic, which secures the communication as intended.