Connecting It All - Designing a Resilient Global Architecture

A production-ready global architecture follows this layered model:

• Users connect to Edge Locations.
• Traffic routes to a selected Region.
• Services run across multiple Availability Zones.
• Critical systems replicate across Regions if required.

Security considerations:

• Regional isolation protects against large-scale failures.
• Multi-AZ reduces infrastructure risk.
• Data residency requirements must be respected.
• Scalability considerations:
• Horizontal scaling across AZs
• Auto Scaling groups
• Stateless service design

A global SaaS architecture typically includes:

• CloudFront at the edge
• Load balancer across multiple AZs
• Auto Scaling compute
• Multi-AZ database
• Optional cross-region replication

AWS global infrastructure is a hierarchy:

• Edge Locations optimize performance.
• Regions provide geographic isolation.
• Availability Zones provide fault tolerance.

Designing systems on AWS requires deliberately distributing workloads across these boundaries to reduce risk and improve resilience.

In this section, I learned:

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How Regions, AZs, and Edge Locations work togetherHow to design for high availabilityHow to incorporate scalability into architectureHow to reason about failure domains in real systems