Cloud Engineer interview question · Most asked
What are regions and availability zones, and how do you use them for resilience?
Summary
A region is a geographic area with several availability zones: isolated data centres with independent power and networking connected by low-latency links. Run production across two or three zones (load balancer, app instances, Multi-AZ databases) to survive a zone failure; use multiple regions only when RTO/RPO or regulation requires surviving a whole-region event.
Longer Answer
Zone redundancy is cheap and standard. Region redundancy adds data replication, failover automation and cost. Azure also has paired regions; Google Cloud VPC networks are global but resources are still zonal or regional.
Key Points
- Region = area; zone = isolated data centre(s).
- Multi-AZ for production by default.
- Multi-region when requirements demand it.
- Know which services are zonal, regional or global.
Deep dive: Cloud Computing Tutorial: Regions and Availability Zones
Explanation
What interviewers look for
Clear distinction and a cost-aware recommendation.
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