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Exam objective

AZ-900

Describe the benefits of using cloud services

This objective sits in Describe cloud concepts, which carries 27% of the Azure Fundamentals exam. The questions below are original, written from the official objective title above, and each explanation cites the Microsoft Azure page it rests on.

Objective title verbatim from the official objectives. Microsoft Azure exam page ↗

A worked example

Shown solved, with the whole explanation open: this is what every question here carries.

Describe cloud concepts

Which statement accurately describes an Azure availability zone?

A single datacenter serving one region's compute and storage capacityOne datacenter on its own has none of the cross-site independence a zone provides, which is why the overview says it cannot offer this protection.
A paired region used for cross-region replication of storageRegion pairs sit a level above zones and describe cross-region replication, such as geo-redundant storage. Zones live inside a single region.
An edge location that caches content close to end usersEdge caching close to users describes Azure Front Door or Azure CDN. Zones handle in-region fault isolation, not content delivery.
A logical grouping of physically separate datacenters within one regionCorrect · your answerCorrect: a zone is one or more separated datacenters, larger than a building and smaller than a region.
A subscription boundary that isolates billing between business departmentsBilling separation is done with subscriptions and management groups. A zone is a physical resilience construct, not a financial boundary.

Correct.

Checked against learn.microsoft.com, August 2026

Concept

Azure limits the blast radius of a fault inside a region by dividing it into locations with independent power, cooling, and networking, so an outage in one leaves the rest serving.

Why D

The overview defines a zone as a logical grouping of one or more physically separate datacenters within a region, each built so that a power or network failure in one leaves the others working.

Source

An availability zone is a logical grouping of one or more physically separate datacenters within a region. Each availability zone is built in a way that if something goes wrong in one (like a power outage or network issue), the others keep working. A single datacenter doesn't offer this level of protection on its own.

What are Azure availability zones?, checked August 2026
#availability-zones#high-availability#regions

Now you: practice questions

No account needed. The explanation opens when you answer.

Sample question 1 of 3

Describe cloud concepts

Your team deploys virtual machines into a single availability zone that it selected. Who handles failover if that zone goes down?

Sample question 2 of 3

Describe cloud concepts

Your team is concerned that spreading an application across availability zones will slow it down. What connects zones inside an Azure region?

Sample question 3 of 3

Describe cloud concepts

Your team runs a regulated workload pinned to one region for data residency. Leadership also wants protection from a full regional outage. What does Azure guidance advise?

That’s 3 of the full Azure Fundamentals bank.

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Read the sources

These are the official pages the questions above cite. Reading them is studying the objective from the primary source, which is what the explanations point you toward anyway.

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