Each division within a start-up organization has a separate account & has created a separate VPC for deploying its servers. They have a regional office having existing internet links over which they are planning to access these servers for management purposes. All servers between these VPC need to have connectivity established between them. The CTO of this fastest growing startup is looking for a fully managed high available & scalable solution considering future growth in the number of VPCs.
Which of the following design approaches can be implemented to meet this requirement?

Answer options:

A.Create VPC Peering between all these VPCs & Create a single VPN connection from the regional office to one of the VPC.B.Create VPC Peering between all these VPCs & Create multiple VPN connections from regional offices to each of the VPC to which it needs to communicate.
C.Create a Transit Gateway with all VPC attached to it & create a single VPN connection from the regional office to one of the VPC.D.Create a Transit Gateway with all VPC attached to it & create a single VPN connection from the regional office to Transit Gateway.

Correct Answer – D
Transit gateway can be deployed to have full-mesh connectivity between multiple VPC & on-premises connectivity either via VPC connection or AWS Direct Connect connections. It is a fully managed service providing high availability & scalability for an increase in the number of VPC in the future.
Option A is incorrect as VPC peering can be done for a small number of VPC. There would be additional overhead for a large number of VPC to implement & manage multiple peering connections.
Option B is incorrect as Creating a VPN connection with all VPC is not a viable solution. The VPN connection can be created with transit Gateway through which it can communicate with all VPCs.
Option C is incorrect as VPN connections need to be created with the Transit gateway & not to a VPC.For more information on AWS Transit Gateway, refer to the following URL
https://aws.amazon.com/transit-gateway/features/