Cloud architecture defines how applications and infrastructure are distributed across geographical locations, isolated zones, and interconnected networks to achieve availability, resilience, and performance goals. It operates at the physical layer (regions, availability zones, data centers) and the logical layer (failover strategies, redundancy patterns, replication models). Understanding cloud architecture is essential because a single misconfigured zone placement or missing health check can turn a minor hardware failure into a service-wide outage. The key mental model: cloud providers give you building blocks for resilience—but you must assemble them correctly, and in 2026 that means layering in Zero Trust security, observability, FinOps, and cloud-native deployment practices from day one.
What This Cheat Sheet Covers
This topic spans 15 focused tables and 118 indexed concepts. Below is a complete table-by-table outline of this topic, spanning foundational concepts through advanced details.
Table 1: Physical Cloud Infrastructure
| Component | Example | Description |
|---|---|---|
us-east-1, eu-west-1 | • Separate geographic area with multiple isolated data centers • Regions are independent to limit blast radius of failures. | |
us-east-1a, us-east-1b | • Isolated data center within a Region with separate power, network, and cooling • minimum of 3 AZs per Region (AWS standard). | |
us-west-2-lax-1 | Low-latency extension of a Region placed closer to population centers for single-digit millisecond latency to end users. | |
CloudFront POP in London | • Content delivery endpoint globally distributed for caching static content near users via CDN • 400+ locations worldwide (AWS). | |
Boston Wavelength Zone (Verizon 5G) | 5G network edge infrastructure embedded in telecom provider networks for ultra-low latency mobile applications (< 10ms). |