Define the AWS Global Infrastructure
Source: Dev.to
Core Building Blocks of the AWS Global Infrastructure
AWS Regions
A Region is a geographic area (e.g., a country or part of a continent) that contains multiple Availability Zones.
- You choose a Region when deploying resources.
- Regions help with data residency/data sovereignty, latency, and disaster recovery planning.
Availability Zones (AZs)
An Availability Zone is one or more data centers within a Region designed for fault isolation.
- A Region contains multiple AZs.
- AZs are separate from each other to reduce the chance that a single failure impacts all of them.
- AZs are connected with high‑bandwidth, low‑latency networking.
Edge Locations
Edge locations are AWS sites designed to bring services closer to end users for lower latency and improved performance.
- Primarily used for content delivery and edge networking services.
- You typically don’t deploy an entire application to an edge location; instead, AWS services use them to serve content or accelerate traffic.
Relationship Among Regions, AZs, and Edge Locations
- Region: a geographic area.
- AZs: multiple isolated locations inside a Region.
- Edge Locations: distributed sites closer to users around the world.
You deploy most workloads in a Region, design for high availability across multiple AZs, and use Edge Locations to improve end‑user performance.
Achieving High Availability with Multiple AZs
High availability means your application continues to run even when something fails.
- Deploy resources across at least two AZs in the same Region.
- Use load balancing and redundancy so a failure in one AZ does not bring down the application.
Why multiple AZs matter
Availability Zones are designed to avoid shared single points of failure. Power, cooling, or facility issues in one AZ are unlikely to impact another AZ in the same Region. A “high‑availability” design within a Region therefore follows a multi‑AZ approach.
When to Use Multiple Regions
Use multiple Regions when you need separation at a broader geographic level than AZs can provide:
- Disaster Recovery (DR): recover if an entire Region becomes unavailable.
- Business Continuity: maintain operations during major disruptions.
- Low Latency for Global Users: place workloads closer to different user populations.
- Data Sovereignty/Residency: keep data in a specific country/Region to meet legal requirements.
Multi‑AZ vs. Multi‑Region
- Multi‑AZ: high availability within a single Region.
- Multi‑Region: disaster recovery, global reach, and sovereignty needs.
Benefits of Edge Locations
Edge locations reduce latency by moving content and entry points closer to users.
Amazon CloudFront (CDN)
- Caches and delivers content (web pages, images, video, APIs) from locations near users.
- Improves performance and reduces load on origin infrastructure.
AWS Global Accelerator
- Improves availability and performance by routing user traffic onto the AWS global network and directing it to optimal regional endpoints.
AWS Local Zones and AWS Wavelength Zones
AWS Local Zones
Local Zones place select AWS services closer to large population or industry centers to support workloads needing very low latency to a specific metro area.
Use when: you need low latency to a particular city/metro region and want AWS‑managed infrastructure closer than a traditional Region.
AWS Wavelength Zones
Wavelength Zones bring AWS services to the edge of 5G networks (in partnership with telecom providers).
Use when: you need ultra‑low latency for mobile/5G use cases such as near‑real‑time gaming, AR/VR, IoT, or video processing close to mobile users.
Quick Exam‑Style Summary
- Region: geographic area containing multiple AZs.
- AZs: isolated locations within a Region, designed to avoid shared single points of failure.
- High Availability: commonly achieved by deploying across multiple AZs.
- Multiple Regions: used for DR/business continuity, global low latency, and data sovereignty.
- Edge locations: improve end‑user performance (via CloudFront) and traffic routing (via Global Accelerator).
- Local Zones: provide low latency to specific metro areas.
- Wavelength Zones: provide ultra‑low latency at the 5G network edge.