The answer is Geo-Redundant Storage (GRS) for the highest durability in Azure. GRS achieves this by first synchronously writing three copies of your data within a single primary region using Locally Redundant Storage (LRS), then asynchronously replicating that data to a physically paired secondary region hundreds of kilometers away, where it is again stored three times. This cross-region replication protects against a complete regional outage, delivering an industry-leading 16 nines (99.99999999999999%) durability over a year. On the AZ-900 exam, this question tests your understanding of how redundancy options map to disaster recovery scenarios; a common trap is confusing GRS with RA-GRS, which adds read access to the secondary region but does not change the durability level. To remember, think “Geo = two regions, highest durability,” and note that GRS is the only option listed that survives a full regional failure.
AZ-900 Describe Azure architecture and services Practice Question
This AZ-900 practice question tests your understanding of describe azure architecture and services. 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.
Which Azure storage redundancy option provides the highest durability by replicating data across two paired Azure regions?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Geo-Redundant Storage (GRS)
Geo-Redundant Storage (GRS) replicates data synchronously three times within a single primary region using LRS, then asynchronously copies that data to a paired secondary region, which is hundreds of kilometers away. This cross-region replication provides the highest durability among the listed options, as it protects against a complete regional outage by maintaining three additional replicas in the secondary region, achieving 16 nines (99.99999999999999%) durability over a given year.
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.
✗
Zone-Redundant Storage (ZRS)
Why it's wrong here
ZRS replicates across availability zones within one region, not across paired regions.
✗
Locally Redundant Storage (LRS)
Why it's wrong here
LRS stores three copies in one data center — no cross-region replication.
✓
Geo-Redundant Storage (GRS)
Why this is correct
GRS replicates within the primary region (LRS) plus asynchronously to a secondary paired region for highest durability.
Related concept
Read the scenario before looking for a memorised answer.
✗
Geo-Zone-Redundant Storage (GZRS)
Why it's wrong here
GZRS combines ZRS within the primary region with geo-replication — it provides even higher durability than GRS.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Geo-Redundant Storage (GRS) with Geo-Zone-Redundant Storage (GZRS), mistakenly thinking GZRS always provides higher durability, but the question explicitly asks for the option that replicates across two paired regions, and GRS is the fundamental cross-region replication tier that achieves the highest durability through that specific mechanism.
Detailed technical explanation
How to think about this question
Under the hood, GRS uses asynchronous replication with a Recovery Point Objective (RPO) of typically less than 15 minutes, meaning data in the secondary region may lag slightly behind the primary. In the event of a regional disaster, Microsoft initiates a failover to the secondary region, but any writes not yet replicated are lost; this trade-off enables the high durability of 16 nines. A real-world scenario where this matters is a financial institution that must meet regulatory compliance for data residency and disaster recovery, where GRS ensures data survives a catastrophic failure of an entire Azure region.
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 Azure architecture and services — This question tests Describe Azure architecture and services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Geo-Redundant Storage (GRS) — Geo-Redundant Storage (GRS) replicates data synchronously three times within a single primary region using LRS, then asynchronously copies that data to a paired secondary region, which is hundreds of kilometers away. This cross-region replication provides the highest durability among the listed options, as it protects against a complete regional outage by maintaining three additional replicas in the secondary region, achieving 16 nines (99.99999999999999%) durability over a given year.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.