A company has hundreds of VPCs that access public endpoints for Amazon S3 and AWS Systems Manager via NAT gateways. All traffic to S3 and Systems Manager flows through those NAT gateways. The network engineer must centralize access to these services and remove the need to use public endpoints, with the least operational overhead. Which solution achieves this?

The correct solution centralizes access to S3 and Systems Manager using interface VPC endpoints in a shared services VPC, connected via Transit Gateway. Turning off private DNS on the endpoints and using Route 53 private hosted zones with alias records allows all connected VPCs to resolve the service endpoints to the private IP addresses of the interface endpoints, without needing to enable private DNS for each endpoint. This approach routes traffic privately and removes the need for NAT gateways for these services, reducing operational overhead. Incorrect options: Using private NAT gateways would still incur NAT gateway costs and management, and doesn't directly leverage VPC endpoints for S3/Systems Manager. The option with Route 53 forwarding rules is less efficient for hundreds of VPCs compared to a private hosted zone associated with all VPCs. Turning on private DNS for interface endpoints would automatically create DNS entries in the VPC where the endpoint resides, but wouldn't propagate these resolutions across hundreds of other VPCs connected via Transit Gateway without additional complex DNS configurations or specific Route 53 Resolver rules for each VPC.