Exam AWS-SysOps topic 1 question 642 discussion

The customer gateway resource represents the customer's side of the VPN connection, and it requires the public IP address of the customer gateway device itself, not the NAT device. The customer gateway device is typically a physical or virtual device that acts as the VPN endpoint in the customer's network. The NAT device performs network address translation and is responsible for translating the private IP addresses of the customer's network to a public IP address for outbound communication. The NAT device's public IP address is not used for creating the customer gateway resource.

https://docs.aws.amazon.com/vpn/latest/s2svpn/cgw-options.html

D - Since it requires public IP to create the connection + IP is behind a NAT.

option D correct https://docs.aws.amazon.com/vpn/latest/s2svpn/cgw-options.html

D is the answer Network address translators need a public IP to communicate over internet

D. The public IP address of the NAT device in front of the customer gateway device

I'll go with D

C: Communication should go to the public IP address of the customer gateway. NAT device translate packets to the private IP of the customer gateway.

D. The public IP address of the NAT device in front of the customer gateway device

You must provide the Internet-routable IP address of the customer gateway's external interface. The IP address must be static and can be behind a device performing network address translation (NAT). D.