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Difficulty: HardAWS Global Infrastructure

A financial services firm is migrating a critical transaction-processing workload to AWS. The application must achieve zero data loss (Recovery Point Objective of 0) during a physical site failure, satisfy strict data residency laws requiring all data to remain within a specific country, and minimize latency for users in that country. To meet these requirements, how should the firm design its infrastructure using AWS Regions and Availability Zones?

  1. A
    Deploy the application in a multi-region active-active configuration across two separate AWS Regions within the country, using synchronous database replication between the regions.
  2. B
    Deploy the primary database in a single Availability Zone, and configure AWS to automatically mirror the data to a neighboring country's Region using synchronous replication.
  3. Deploy the application across multiple Availability Zones within a single AWS Region located in the target country, utilizing synchronous replication between the zones.Answer
  4. D
    Configure a single Availability Zone to span across two different AWS Regions within the country to ensure physical redundancy and power grid independence.

Answer

Deploy the application across multiple Availability Zones within a single AWS Region located in the target country, utilizing synchronous replication between the zones.
Deploying the application across multiple Availability Zones within a single AWS Region located in the target country meets all requirements. Availability Zones within the same Region are connected by high-speed, private fiber-optic networks that support the low-latency required for synchronous replication (achieving RPO of 0). Because all selected Availability Zones reside within the single Region in the target country, the data residency requirement is fully satisfied.

Step-by-Step Solution

1
Analyze the data residency requirement.
The workload and its data must remain within the specific country, meaning all infrastructure components used must reside in an AWS Region physically located inside that country.
Choosing a Region within the country guarantees compliance with local data residency laws.
2
Analyze the low-latency and zero data loss (RPO = 0) requirement.
Synchronous database replication must be used to ensure zero data loss during a site failure. This requires the low-latency connections only available between Availability Zones within the same AWS Region.
Replication across different AWS Regions is asynchronous because the physical distance introduces latency that makes synchronous replication impractical for real-time transactions.
3
Analyze the high-availability and physical site failure requirement.
Deploying the application across multiple Availability Zones within that single Region provides protection against fire, lightning strikes, power outages, and other localized physical disasters.
Each Availability Zone is physically separated, located in different flood plains, and supplied by independent power grids, preventing correlated failures.

Key Concept

AWS Regions vs Availability Zones Connectivity and Boundaries
Estimated Time:2m 0s
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Topics

AWS Global Infrastructure

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