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AWS Certified Advanced Networking - Specialty · AWS
Select one answer.
Written by other learners. Comments can disagree with the marked answer — check the official documentation when in doubt.
Dead Peer Detection (DPD) is a method used to detect if the peer in a VPN connection is no longer reachable. By setting the DPD timeout action to "Restart," the VPN endpoint will attempt to re-establish the IKE session if it detects that the peer is no longer reachable. Initiating traffic from on premises to the VPC can trigger this process and bring up the IKE session if it has gone down.
Correct answer is B.
https://docs.aws.amazon.com/vpn/latest/s2svpn/initiate-vpn-tunnels.html