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Difficulty: MediumAzure Regions, Availability Zones, and Region Pairs

A municipal government is migrating its central emergency dispatch system to Azure. The system must remain operational even if an entire physical datacenter facility suffers a power outage or cooling failure. To meet local regulatory standards, all application data and backups must remain strictly within the country's borders, and network latency between the active application and its standby database must be kept to a minimum. Which Azure architectural feature should the municipal government use to meet these requirements?

  1. A
    Azure Region Pairs
  2. Availability ZonesAnswer
  3. C
    Multiple distinct Azure regions
  4. D
    Azure Resource Groups in separate locations

Answer

Availability Zones protect against datacenter failures within a single region while keeping data residency local and latency minimal.
Availability Zones provide high availability within a single Azure region by placing resources in physically separate datacenters that have independent power, cooling, and networking. This design minimizes latency between zones (compared to crossing regions) and ensures data residency remains within the chosen region, meeting the regulatory requirements.

Step-by-Step Solution

1
Analyze the requirements: protection against localized datacenter failures (power/cooling), minimal latency between components, and strict national data residency compliance.
The solution must offer datacenter-level redundancy within a single region, as regional replication increases latency and may cross political borders.
Identifying the scope of redundancy (datacenter vs. region) narrows down the architectural choice.
2
Evaluate the architectural options based on their capabilities.
Availability Zones are isolated datacenters within a single region. Region Pairs and multiple regions span hundreds of miles (introducing latency and residency risk). Resource Groups are logical, not physical, boundaries.
Comparing capabilities against the constraints leads directly to the correct feature.

Key Concept

Availability Zones provide physical isolation and redundancy within a single Azure region, ensuring low-latency high availability and maintaining data residency.
Estimated Time:1m 30s
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Topics

Azure Regions, Availability Zones, and Region Pairs

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