- A
Two datacenters within the same city connected by high-speed fiber
Why wrong: Availability zones are datacenters within the same city — region pairs are at least 300 miles apart for disaster resilience.
- B
Two Azure regions paired for disaster recovery and update isolation
Region pairs are geographically separated (300+ miles) and coupled so that platform updates aren't applied simultaneously and recovery is prioritized.
- C
Two subscriptions in the same Azure AD tenant
Why wrong: Region pairs are geographic infrastructure pairs — they have nothing to do with subscriptions or tenants.
- D
Primary and secondary zones within a single Azure region
Why wrong: Availability zones are intra-region — region pairs are two distinct regions separated by hundreds of miles.
Quick Answer
The answer is that a region pair consists of two Azure regions within the same geography, at least 300 miles apart, directly connected via high-speed fiber, and used for disaster recovery and planned maintenance isolation. This design ensures that only one region in a pair is updated at a time, drastically reducing the risk of simultaneous failures across both regions, which is the core technical concept behind the definition. On the Microsoft Azure Fundamentals AZ-900 exam, this tests your understanding of Azure’s resilience and high-availability architecture; a common trap is confusing a region pair with a simple availability zone, but remember that availability zones are within a single region, while region pairs span separate geographic locations. To lock in the concept, use the memory tip: “Pair for repair and spare” — one region is always spared from updates while the other is being repaired, ensuring continuous service.
AZ-900 Describe cloud concepts Practice Question
This AZ-900 practice question tests your understanding of describe cloud concepts. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
What distinguishes a 'region pair' in Azure?
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
Two Azure regions paired for disaster recovery and update isolation
A region pair consists of two Azure regions within the same geography, at least 300 miles apart, that are directly connected via high-speed fiber and are used for disaster recovery and planned maintenance isolation. This design ensures that only one region in a pair is updated at a time, reducing the risk of simultaneous failures across both regions.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Two datacenters within the same city connected by high-speed fiber
Why it's wrong here
Availability zones are datacenters within the same city — region pairs are at least 300 miles apart for disaster resilience.
- ✓
Two Azure regions paired for disaster recovery and update isolation
Why this is correct
Region pairs are geographically separated (300+ miles) and coupled so that platform updates aren't applied simultaneously and recovery is prioritized.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Two subscriptions in the same Azure AD tenant
Why it's wrong here
Region pairs are geographic infrastructure pairs — they have nothing to do with subscriptions or tenants.
- ✗
Primary and secondary zones within a single Azure region
Why it's wrong here
Availability zones are intra-region — region pairs are two distinct regions separated by hundreds of miles.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse region pairs with availability zones, thinking a region pair is two datacenters within the same region, but region pairs are always two distinct regions separated by a significant geographic distance.
Detailed technical explanation
How to think about this question
Azure region pairs are designed with a recovery point objective (RPO) of at least 300 miles to ensure data residency and compliance, and they guarantee that platform updates are rolled out sequentially across the pair to prevent simultaneous impact. For example, if a disaster affects one region, Azure can prioritize restoring the paired region, and services like Azure Storage geo-redundant storage (GRS) automatically replicate data to the paired region. This architecture is mandated by Azure's Service Level Agreement (SLA) for certain services, ensuring at least 99.99% availability for paired region configurations.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Describe cloud concepts — study guide chapter
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FAQ
Questions learners often ask
What does this AZ-900 question test?
Describe cloud concepts — This question tests Describe cloud concepts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Two Azure regions paired for disaster recovery and update isolation — A region pair consists of two Azure regions within the same geography, at least 300 miles apart, that are directly connected via high-speed fiber and are used for disaster recovery and planned maintenance isolation. This design ensures that only one region in a pair is updated at a time, reducing the risk of simultaneous failures across both regions.
What should I do if I get this AZ-900 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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.
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