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AZ-900 Practice Question 4: Availability Zones

Microsoft Azure Fundamentals (AZ-900) · Test 1 · question 4 of 10

Azure Architectureeasy

Which statement accurately describes an Azure availability zone?

Select one answer
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Answer:

  • A. A physically separate group of one or more datacenters inside a single Azure region, with independent power, cooling, and networking

An availability zone is a *logical grouping of one or more physically separate datacenters* within a region. Each zone has its own power, cooling, and networking, so an outage in one zone leaves the others running. Zones are typically several kilometres apart, usually within 100 km, which is close enough for low-latency synchronous replication but far enough that a single local event is unlikely to take out more than one. Note that not every Azure region offers availability zones.

Option B describes a paired region, which protects against a region-wide outage, not a zone. Option C describes dedicated or isolated hardware; a zone is a datacenter-scale boundary, not a rack, and it is not customer-specific. Option D is the definition of a resource group, which is a management and billing construct with no physical meaning.

Reference: What are Azure availability zones?

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