Which solution will meet these requirements?
Create an AWS Site-to-Site VPN connection between the on-premises data center and a new central VPC. Create VPC peering connections that initiate from the central VPC to all other VPCs.
Create an AWS Direct Connect connection between the on-premises data center and AWS. Provision a transit VIF, and connect it to a Direct Connect gateway. Connect the Direct Connect gateway to all the other VPCs by using a transit gateway in each Region.
Create an AWS Site-to-Site VPN connection between the on-premises data center and a new central VPC. Use a transit gateway with dynamic routing. Connect the transit gateway to all other VPCs.
Create an AWS Direct Connect connection between the on-premises data center and AWS. Establish an AWS Site-to-Site VPN connection between all VPCs in each Region. Create VPC peering connections that initiate from the central VPC to all other VPCs.
Explanations:
VPC peering does not support transitive routing, meaning it cannot allow VPCs in different regions to communicate via a central VPC. The solution lacks scalability.
AWS Direct Connect with a Direct Connect gateway and transit gateway in each region supports transitive routing, increased bandwidth, and reduced outbound traffic costs.
While the transit gateway offers transitive routing between VPCs, using only a Site-to-Site VPN introduces performance and scalability issues compared to Direct Connect.
The solution relies on both Site-to-Site VPN and VPC peering, but VPC peering cannot provide transitive routing, making it unsuitable for this use case.
As I recall, the answer is:
Create an AWS Direct Connect connection between the on-premises data center and AWS. Provision a transit VIF, and connect it to a Direct Connect gateway. Connect the Direct Connect gateway to all the other VPCs by using a transit gateway in each Region.