A. Set up a transit gateway in each Region. Establish a redundant AWS Site-to-Site VPN connection between the on-premises firewalls and the transit gateway in the Region that is closest to the on-premises network. Peer all the transit gateways with each other. Connect all the VPCs to the transit gateway in their Region. Most Voted
B. Create an AWS CloudFormation template for a redundant AWS Site-to-Site VPN tunnel to the on-premises network. Deploy the CloudFormation template for each VPC. Set up VPC peering between all the VPCs for VPC-to-VPC communication.
C. Set up a transit gateway in each Region. Establish a redundant AWS Site-to-Site VPN connection between the on-premises firewalls and each transit gateway. Route traffic between the different Regions through the company’s on-premises firewalls. Connect all the VPCs to the transit gateway in their Region.
D. Create an AWS CloudFormation template for a redundant AWS Site-to-Site VPN tunnel to the on-premises network. Deploy the CloudFormation template for each VPC. Route traffic between the different Regions through the company’s on-premises firewalls.

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