AZ-900 Describe Azure architecture and services Practice Question
This AZ-900 practice question tests your understanding of describe azure architecture and services. 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 healthcare organization stores patient records in Azure Blob Storage. They require that data remains available even if an entire Azure datacenter fails, and they also need to ensure data is replicated within the same region for low latency. Which storage redundancy option should they choose?
Why wrong: LRS replicates data three times within a single datacenter. Thus, if that datacenter fails, data may be lost.
B
Zone-Redundant Storage (ZRS)
ZRS replicates data across availability zones within the same region, protecting against datacenter failures while maintaining low latency.
C
Geo-Redundant Storage (GRS)
Why wrong: GRS replicates data to a secondary region, providing geographic redundancy, but the secondary region is distant, increasing latency.
D
Read-Access Geo-Redundant Storage (RA-GRS)
Why wrong: RA-GRS is similar to GRS but allows read access from the secondary region; still involves cross-region replication, not within the same region.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Zone-Redundant Storage (ZRS)
Zone-Redundant Storage (ZRS) synchronously replicates data across three Azure availability zones within the same region, ensuring data remains available even if an entire datacenter (one zone) fails. This meets both the availability requirement and the low-latency requirement because replication stays within the region, avoiding cross-region latency.
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.
✗
Locally Redundant Storage (LRS)
Why it's wrong here
LRS replicates data three times within a single datacenter. Thus, if that datacenter fails, data may be lost.
✓
Zone-Redundant Storage (ZRS)
Why this is correct
ZRS replicates data across availability zones within the same region, protecting against datacenter failures while maintaining low latency.
Related concept
Read the scenario before looking for a memorised answer.
✗
Geo-Redundant Storage (GRS)
Why it's wrong here
GRS replicates data to a secondary region, providing geographic redundancy, but the secondary region is distant, increasing latency.
✗
Read-Access Geo-Redundant Storage (RA-GRS)
Why it's wrong here
RA-GRS is similar to GRS but allows read access from the secondary region; still involves cross-region replication, not within the same region.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'surviving a datacenter failure' with needing geo-redundancy, but ZRS within the same region is sufficient and avoids the latency penalty of cross-region replication.
Trap categories for this question
Similar concept trap
RA-GRS is similar to GRS but allows read access from the secondary region; still involves cross-region replication, not within the same region.
Detailed technical explanation
How to think about this question
ZRS uses synchronous replication across availability zones, meaning a write is acknowledged only after it is committed to all three zones, ensuring strong consistency. In contrast, GRS uses asynchronous replication to a paired region, which can introduce a recovery point objective (RPO) of up to 15 minutes. For healthcare patient records, ZRS provides the best balance of high availability within a region while meeting low-latency access needs, as all replicas are in the same geographic area.
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: Zone-Redundant Storage (ZRS) — Zone-Redundant Storage (ZRS) synchronously replicates data across three Azure availability zones within the same region, ensuring data remains available even if an entire datacenter (one zone) fails. This meets both the availability requirement and the low-latency requirement because replication stays within the region, avoiding cross-region latency.
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.