AZ-305 Design data storage solutions Practice Question
This AZ-305 practice question tests your understanding of design data storage solutions. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 globally distributed application requires multi-region writes to a NoSQL database and must tolerate regional write outages. Which Azure service capability should be selected?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure Cosmos DB multi-region writes
Azure Cosmos DB multi-region writes is the correct choice because it provides active-active replication across multiple Azure regions, enabling writes to be accepted in any configured region and automatically replicated. This design ensures that if one region experiences a write outage, the application can continue writing to other regions without interruption, meeting the requirement for multi-region writes and regional write outage tolerance.
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.
✗
Azure Table Storage RA-GRS
Why it's wrong here
RA-GRS provides secondary read access, not multi-region writes.
✗
Azure SQL Database serverless only
Why it's wrong here
Serverless adjusts compute but does not provide multi-region writes.
✓
Azure Cosmos DB multi-region writes
Why this is correct
Cosmos DB supports multi-region writes for globally distributed applications requiring write availability across regions.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure Files geo-redundant storage
Why it's wrong here
Azure Files replication does not provide multi-region database writes.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse geo-redundant storage options (like RA-GRS or GRS) with active-active multi-region write capabilities, not realizing that most Azure storage services (including Table Storage and Files) only support writes to a single primary region, whereas Cosmos DB is the only service that natively supports multi-region writes.
Detailed technical explanation
How to think about this question
Azure Cosmos DB multi-region writes uses a multi-master replication protocol based on a consensus model that allows each region to accept writes independently, with conflict resolution handled via last-writer-wins (LWW) or custom conflict resolution policies. Under the hood, it leverages the Azure Cosmos DB gateway to route requests to the nearest region and uses a replication log to ensure eventual consistency across regions, with a 99.999% availability SLA when configured for multi-region writes.
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-305 question in full detail.
Design data storage solutions — This question tests Design data storage solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Azure Cosmos DB multi-region writes — Azure Cosmos DB multi-region writes is the correct choice because it provides active-active replication across multiple Azure regions, enabling writes to be accepted in any configured region and automatically replicated. This design ensures that if one region experiences a write outage, the application can continue writing to other regions without interruption, meeting the requirement for multi-region writes and regional write outage tolerance.
What should I do if I get this AZ-305 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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