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Difficulty: MediumAzure Regions, Availability Zones, and Region Pairs

A financial services firm is migrating its transaction logging application to Azure. To meet strict regulatory standards, the application must be designed to withstand a complete regional outage (such as a widespread natural disaster affecting an entire metropolitan area). The company also requires that data replication for disaster recovery occurs over a distance of at least 300 miles, while ensuring that the data remains within the same national boundary for compliance.

Which Azure architectural feature should the firm use to meet these requirements?

  1. A
    Azure Availability Zones
  2. Azure Region PairsAnswer
  3. C
    Azure Availability Sets
  4. D
    Azure Resource Groups

Answer

Azure Region Pairs
Azure Region Pairs is the correct architectural feature because they designate two regions within the same geographic boundary (e.g., East US and West US) that are at least 300 miles apart. This separation meets the disaster recovery requirement for regional outages while adhering to data residency compliance rules.

Step-by-Step Solution

1
Identify the primary requirement: protecting against a complete regional outage using disaster recovery (DR) across a distance of at least 300 miles.
This eliminates single-region high availability options like Availability Zones and Availability Sets, which are situated within a single region and do not provide 300 miles of geographical separation.
Understanding the difference between high availability (local datacenter resilience) and disaster recovery (regional outage resilience) is critical for selecting the correct scope of infrastructure.
2
Evaluate the remaining options against the compliance requirement (data residency within the same national boundary).
Azure Region Pairs are specifically designed to pair regions within the same geography (except for Brazil South) separated by at least 300 miles, ensuring both disaster recovery replication distance and compliance with local sovereignty laws.
Azure Region Pairs guarantee that data remains within the same geopolitical region for replication, satisfying data residency requirements.

Key Concept

Azure Region Pairs provide disaster recovery by linking two regions within the same geography that are separated by at least 300 miles.
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Topics

Azure Regions, Availability Zones, and Region Pairs

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