A. Create a transit gateway in an AWS account. Share the transit gateway across accounts by using AWS Resource Access Manager (AWS RAM).
B. Configure attachments to all VPCs and VPNs.
C. Set up transit gateway route tables. Associate the VPCs and VPNs with the route tables.
D. Configure VPC peering between the VPCs.
E. Configure attachments between the VPCs and VPNs.
F. Set up route tables on the VPCs and VPNs.

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