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Answer: Configure a cross-account transit gateway peering attachment between TGW-C and TGW-P. Configure the routing between the transit gateways to use the peering attachment.
To establish network connectivity between the company's VPCs and the partner's VPCs in us-east-1 with minimal changes to both networks, the most efficient solution is to configure a cross-account transit gateway peering attachment between TGW-C and TGW-P. This approach allows for direct routing between the transit gateways without the need for additional VPCs, routers, or VPN connections. It leverages the existing transit gateway infrastructure and requires only the creation of a peering attachment and the necessary routing configurations. This method is less complex and more scalable than deploying new resources or setting up VPN connections, making it the optimal choice for this scenario.
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A company and its partner are collaborating on a research project, each with multiple VPCs in the us-east-1 Region. The company's VPCs use CIDR blocks within 10.10.0.0/16 and are connected via a transit gateway named TGW-C (ASN 64520). The partner's VPCs use CIDR blocks within 172.16.0.0/16 and are connected via a transit gateway named TGW-P (ASN 64530).
What solution will enable network connectivity between the company's and partner's VPCs in us-east-1 with the MINIMUM changes to both networks?
A
Create a new VPC in a new account. Deploy a router from AWS Marketplace. Share TGW-C and TGW-P with the new account by using AWS Resource Access Manager (AWS RAM). Associate TGW-C and TGW-P with the new VPC. Configure the router in the new VPC to route between TGW-C and TGW-P.
B
Create an IPsec VPN connection between TGW-C and TGW-P. Configure the routing between the transit gateways to use the IPsec VPN connection.
C
Configure a cross-account transit gateway peering attachment between TGW-C and TGW-P. Configure the routing between the transit gateways to use the peering attachment.
D
Share TGW-C with the partner account by using AWS Resource Access Manager (AWS RAM). Associate the partner VPCs with TGW-C. Configure routing in the partner VPCs and TGW-C.
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