Describe Azure architecture and services
Azure Global Infrastructure
CoreRecognize datacenters, regions, region pairs, sovereign regions, and availability zones.
Aligned to the AZ-900 skills measured as of July 20, 2026; product behavior verified August 23, 2026.
Why this matters
Location and resiliency choices depend on whether a requirement concerns a physical facility, isolation inside one region, a relationship between regions, or a jurisdiction-specific Azure environment.
Must Know
- Azure datacenters house physical compute, networking, and storage infrastructure.
- An Azure region is a geographic area containing one or more datacenters connected by a low-latency network.
- An availability zone is a physically separate, fault-isolated group of datacenters within a supported region, with independent power, cooling, and networking.
- A region pair is a relationship between two Azure regions within the same geography for some platform resiliency considerations.
- Sovereign regions are isolated Azure environments designed for particular government or jurisdictional requirements.
Compare and Distinguish
- Datacenter vs region: physical facility versus geographic deployment boundary containing datacenter infrastructure.
- Region vs availability zone: geographic area versus fault-isolated datacenter group inside a supported region.
- Region pair vs availability zones: an inter-region relationship versus isolation within one region.
- Public region vs sovereign region: general Azure environment versus a separately operated environment for specific compliance or jurisdiction needs.
Scenario examples
- A workload needing isolation from a datacenter failure inside one region uses availability zones where supported.
- A government workload with a stated isolated-jurisdiction requirement evaluates a sovereign region.
- A business selects an Azure region based on location, service availability, compliance, and latency needs.
Exam traps
- Not every service and region supports identical zone behavior.
- Customers do not select individual Azure datacenter buildings as resource hierarchy scopes.
- A region pair is not the same as two availability zones.
Key takeaways
- Datacenters form the physical foundation.
- Regions are geographic deployment boundaries; zones are fault boundaries within supported regions.
- Sovereign regions serve particular jurisdictional needs.
Ready for the quiz?
- Where does an availability zone exist?
- How does a region pair differ from a zone?
- What requirement points to a sovereign region?
Related objectives
- D2.1.S1 — Describe Azure regions, region pairs, and sovereign regions
- D2.1.S2 — Describe availability zones
- D2.1.S3 — Describe Azure datacenters