AZ-900 Describe Azure architecture and services Practice Question
A global company is designing a disaster recovery solution for a critical application. They plan to deploy the application to two Azure regions. The company wants to minimize the risk of both regions failing simultaneously due to a major platform update or a widespread natural disaster. Which Azure feature provides a specific pairing of regions to meet this goal?
⚠ Common exam trap
Watch out — candidates often confuse Availability Zones (which protect within a region) with region pairs (which protect across regions), or assume that any two regions can be used for disaster recovery with the same guarantees as official region pairs.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure region pairs
Azure region pairs are designed to ensure that two paired regions are updated sequentially during platform maintenance, reducing the risk of simultaneous failure. They are also physically separated by at least 300 miles to minimize the impact of natural disasters. This meets the company's goal of minimizing simultaneous failure risk from both a major platform update and a widespread natural disaster.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Availability Zones within a single region
Why it's wrong here
Availability Zones are physically separate datacenters within a single Azure region, each with independent power, cooling, and networking. They protect against datacenter-level failures (e.g., a fire or rack outage) and offer high availability for applications, but they do not protect against a whole-region failure such as a natural disaster or regional network outage. Since the scenario requires DR across two geographic regions, Availability Zones cannot satisfy that requirement because they are contained within one region and do not provide any region-pairing or cross-region sequential update guarantees.
When this WOULD be correct
A question asking how to protect an application against a single datacenter failure within a region, while ensuring low-latency replication and high availability, would have Availability Zones as the correct answer.
- ✓
Azure region pairs
Why this is correct
Azure region pairs are defined by Microsoft as two regions within the same geography that are at least 300 miles apart. They provide automatic fault isolation and ensure that planned updates are rolled out sequentially—only one region in the pair is updated at a time—to reduce the risk of simultaneous failures. For disaster recovery, this pairing guarantees that if a major event affects one region, the paired region is prioritized for recovery and has lower latency connectivity, making it the specific Azure feature designed for cross-region DR scenarios.
- ✗
Azure Traffic Manager with geographic routing
Why it's wrong here
Traffic Manager is a DNS-based load balancer that routes traffic to endpoints based on routing methods like geographic proximity. It does not define or guarantee any pairing between regions for disaster recovery or update sequencing.
When this WOULD be correct
A company needs to route users to the nearest healthy application endpoint across multiple regions for low latency and high availability, without requiring active-passive replication. Traffic Manager with geographic routing would be correct for global load balancing based on user geography.
- ✗
Azure Site Recovery replication between any two regions of your choice
Why it's wrong here
Azure Site Recovery can replicate virtual machines between any two Azure regions, but it does not provide the additional guarantees of sequential updates and physical isolation that are inherent to region pairs. Using a region pair is a recommended best practice when using Site Recovery.
When this WOULD be correct
A company needs to replicate virtual machines from one Azure region to another specific region for disaster recovery, and they want to choose any two regions based on cost or latency, not necessarily paired regions. In that scenario, Azure Site Recovery with custom region selection would be correct.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The AZ-900 exam frequently reuses these exact scenarios with slightly different constraints.
✓Azure region pairsCorrect answer▾
Why this is correct
Azure region pairs are defined by Microsoft as two regions within the same geography that are at least 300 miles apart. They provide automatic fault isolation and ensure that planned updates are rolled out sequentially—only one region in the pair is updated at a time—to reduce the risk of simultaneous failures. For disaster recovery, this pairing guarantees that if a major event affects one region, the paired region is prioritized for recovery and has lower latency connectivity, making it the specific Azure feature designed for cross-region DR scenarios.
✗Availability Zones within a single regionWrong answer — click to see why▾
Why this is wrong here
Availability Zones protect against datacenter-level failures within a single region, not against simultaneous failure of two regions due to a major platform update or widespread natural disaster.
★ When this WOULD be the correct answer
A question asking how to protect an application against a single datacenter failure within a region, while ensuring low-latency replication and high availability, would have Availability Zones as the correct answer.
Why candidates choose this
Candidates may confuse Availability Zones with region pairs, thinking that multiple zones provide geographic separation, but zones are within one region and do not protect against region-wide disasters.
✗Azure Traffic Manager with geographic routingWrong answer — click to see why▾
Why this is wrong here
Azure Traffic Manager with geographic routing directs traffic based on user location, not on ensuring that paired regions fail independently. It does not provide the specific region pairing that minimizes simultaneous failure risk from platform updates or natural disasters.
★ When this WOULD be the correct answer
A company needs to route users to the nearest healthy application endpoint across multiple regions for low latency and high availability, without requiring active-passive replication. Traffic Manager with geographic routing would be correct for global load balancing based on user geography.
Why candidates choose this
Candidates may confuse geographic routing with disaster recovery, thinking that routing traffic away from a failed region achieves the same goal as region pairing, but it does not address the underlying risk of correlated failures in unpaired regions.
✗Azure Site Recovery replication between any two regions of your choiceWrong answer — click to see why▾
Why this is wrong here
Azure Site Recovery replication between any two regions of your choice does not guarantee that the regions are paired to minimize simultaneous failures from platform updates or natural disasters; region pairs are specifically designed for that purpose.
★ When this WOULD be the correct answer
A company needs to replicate virtual machines from one Azure region to another specific region for disaster recovery, and they want to choose any two regions based on cost or latency, not necessarily paired regions. In that scenario, Azure Site Recovery with custom region selection would be correct.
Why candidates choose this
Candidates may think that Azure Site Recovery's ability to replicate between any two regions provides the same resilience as region pairs, overlooking that region pairs are specifically engineered to reduce co-failure risks.
Analysis generated from the official AZ-900blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Go deeper
Related to this question
Learn chapter
Azure Regions and Geographies
Key term
Feature
A feature is a distinct unit of functionality that delivers value to the user, often managed and tracked throughout the software development lifecycle.
Key term
Region
A region is a distinct geographic location where a cloud provider operates multiple data centers that are connected by low-latency networks and provide cloud services.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This AZ-900 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the AZ-900 exam.