The answer is Azure Cosmos DB with multi-region writes and automatic failover because it is the only Azure storage solution purpose-built for globally distributed structured data that requires low latency reads and writes across multiple regions. Cosmos DB achieves this through its turnkey global distribution, which replicates data to any number of Azure regions and supports active-active multi-region writes, ensuring single-digit millisecond read and write latencies at the 99th percentile regardless of geographic distance. On the AZ-204 exam, this scenario tests your understanding of when to choose Cosmos DB over alternatives like Azure SQL Database or Table Storage—the key trap is that SQL Database supports geo-replication but lacks multi-region writes and cannot match Cosmos DB’s sub-10ms latency guarantees for globally distributed workloads. Remember the mnemonic “GLAD” for Global distribution, Low latency, Automatic failover, and Database-level consistency control.
AZ-204 Develop for Azure storage Practice Question
This AZ-204 practice question tests your understanding of develop for azure storage. 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.
You are designing a solution to store large amounts of structured data that is accessed frequently and requires low-latency reads. The data must be globally distributed and support automatic failover. Which Azure storage solution should you recommend?
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 with multi-region writes and automatic failover.
Azure Cosmos DB with multi-region writes and automatic failover is the correct choice because it provides globally distributed, low-latency reads and writes with automatic failover at the database level. It supports multiple consistency models and guarantees single-digit millisecond read latencies, making it ideal for frequently accessed structured data that requires global distribution and high availability.
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 with geo-replication.
Why it's wrong here
Azure Table Storage does not offer global distribution and automatic failover with the same guarantees.
✓
Azure Cosmos DB with multi-region writes and automatic failover.
Why this is correct
Azure Cosmos DB provides global distribution, low-latency reads, and automatic failover.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure SQL Database with active geo-replication and failover groups.
Why it's wrong here
Azure SQL Database supports failover groups but is not as globally distributed as Cosmos DB.
✗
Azure Blob Storage with read-access geo-redundant storage (RA-GRS).
Why it's wrong here
Azure Blob Storage is for unstructured data, not structured data.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Azure Table Storage (which is a NoSQL key-value store) with Cosmos DB's Table API, but Table Storage lacks the global distribution, automatic failover, and low-latency guarantees that Cosmos DB provides, leading them to choose Option A incorrectly.
Detailed technical explanation
How to think about this question
Cosmos DB uses a multi-master replication protocol that allows any region to accept writes, with conflict resolution handled via last-writer-wins (LWW) or custom conflict resolution policies. Under the hood, it leverages a globally distributed set of replicas and a quorum-based commit protocol to ensure consistency while maintaining low latency. In a real-world scenario, an e-commerce platform with users worldwide can use Cosmos DB to store product catalogs and shopping cart data, achieving <10 ms read latencies at the 99th percentile even during regional outages.
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-204 question in full detail.
Develop for Azure storage — This question tests Develop for Azure storage — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Azure Cosmos DB with multi-region writes and automatic failover. — Azure Cosmos DB with multi-region writes and automatic failover is the correct choice because it provides globally distributed, low-latency reads and writes with automatic failover at the database level. It supports multiple consistency models and guarantees single-digit millisecond read latencies, making it ideal for frequently accessed structured data that requires global distribution and high availability.
What should I do if I get this AZ-204 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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