Consult the following AWS whitepapers for more information:
- Building a Scalable and Secure Multi-VPC AWS Network Infrastructure: https://d1.awsstatic.com/whitepapers/building-a-scalable-and-secure-multi-vpc-aws-network-infrastructure.pdf
- Extend your IT Infrastructure with Amazon Virtual Private Cloud: https://d1.awsstatic.com/whitepapers/extend-your-it-infrastructure-with-amazon-vpc.pdf