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AWS vs. GCP VPC architecture deep dive


Introduction: Modern cloud-native companies (e.g. Airbnb, Netflix) operate complex virtual networks to support global, large-scale services. Achieving scalable, secure, and highly available networking in the cloud requires careful VPC architecture design. This report compares AWS and GCP best practices for Virtual Private Cloud (VPC) networks at enterprise scale. We focus on VPC structure, subnet segmentation, multi-account/project design, shared VPC strategies, cross-region connectivity, service isolation, and secure access patterns, with high-level ASCII diagrams illustrating key topologies.

While that’s more of an app design principle, it’s worth noting that network architecture alone isn’t the sole security mechanism at Google scale – identity-based access (IAM, service accounts) and encryption are heavily used. Also, using Infrastructure-as-Code(like Terraform) or Deployment Manager to codify the network structure (projects, VPCs, firewall rules) is critical at scale to avoid drift – although no code examples here, the design principles imply reproducibility and automation. By adhering to these high-level principles and architectures, enterprises can confidently design virtual networks that support millions of users and services worldwide, with strong isolation and control where needed, and efficient connectivity and discovery to tie it all together.

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