The answer is Azure region pairs, because this feature is specifically designed to protect against a complete region failure by pairing each Azure region with another region in the same geography, such as East US paired with West US. These pairs are physically separated by hundreds of miles, with independent power, cooling, and networking, so if one region goes down, Azure can automatically fail over services like geo-redundant storage (GRS) and SQL Database geo-replication to the healthy paired region, ensuring your application remains available. On the AZ-900 exam, this concept tests your understanding of high availability and disaster recovery at the region level—a common trap is confusing availability zones (which protect against datacenter failures within one region) with region pairs (which protect against full region outages). Remember the memory tip: “Pairs protect the region, zones protect the building.”
AZ-900 Describe cloud concepts Practice Question
This AZ-900 practice question tests your understanding of describe cloud concepts. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
A company wants to ensure their application remains available even if an entire Azure region experiences an outage. Which Azure feature should they implement?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Region pairs
Region pairs are designed to provide resilience against a complete Azure region outage by pairing each region with another region in the same geography (e.g., East US paired with West US). If one region fails, Azure can fail over services like storage (GRS) and SQL Database (Geo-Replication) to the paired region, ensuring application availability. This is the only option that protects against an entire region failure, as it leverages physically separate datacenters with independent power, cooling, and networking.
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.
✗
Availability sets
Why it's wrong here
Availability sets protect against failures within a single datacenter, not across entire regions.
✗
Availability zones
Why it's wrong here
Availability zones protect against datacenter failures within a region, not a full regional outage.
✓
Region pairs
Why this is correct
Region pairs provide cross-region disaster recovery and are designed for regional outages.
Related concept
Read the scenario before looking for a memorised answer.
✗
Load balancer
Why it's wrong here
Load balancer distributes traffic but does not provide cross-region failover.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse Availability zones (which protect against datacenter failures within a region) with Region pairs (which protect against full region outages), and they often overlook that Availability zones cannot survive a complete region failure because they share the same regional boundary.
Detailed technical explanation
How to think about this question
Under the hood, Azure Region Pairs use a minimum 300-mile separation between paired regions to reduce the risk of simultaneous natural disasters, and data replication (e.g., GRS for storage) is asynchronous to the paired region. During a region outage, Microsoft prioritizes restoring one region per pair, and services like Azure SQL Database support geo-failover with a Recovery Point Objective (RPO) of up to 1 hour and Recovery Time Objective (RTO) of up to 1 hour for geo-replicated databases. A real-world scenario is a hurricane disabling an entire region; the paired region automatically takes over for replicated services, but applications must be designed to handle the failover latency and potential data loss.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-900 question in full detail.
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: Region pairs — Region pairs are designed to provide resilience against a complete Azure region outage by pairing each region with another region in the same geography (e.g., East US paired with West US). If one region fails, Azure can fail over services like storage (GRS) and SQL Database (Geo-Replication) to the paired region, ensuring application availability. This is the only option that protects against an entire region failure, as it leverages physically separate datacenters with independent power, cooling, and networking.
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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Question Discussion
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