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A security technician is trying to connect a remote site to the central office over a site-to-site VPN. The technician has verified the source and destination IP addresses are correct, but the technician is unable to get the remote site to connect. The following error message keeps repeating: "An error has occurred during Phase 1 handshake. Deleting keys and retrying..." Which of the following is most likely the reason the connection is failing?
Correct Answer: C
The error indicates an issue during Phase 1 of the IKE handshake, which is used for establishing secure key exchange in IPSec VPNs. If the Diffie-Hellman group is legacy (e.g., Group 1 or 2), it might no longer be supported by modern systems, causing the connection to fail. Updating to a stronger Diffie-Hellman group (e.g., Group 14 or 19) resolves this issue.