Quick Answer
The answer is Azure Cosmos DB, which is the correct choice for mobile app offline data synchronization because it offers a built-in offline data sync capability through the Azure Mobile Apps SDK, allowing user-generated content to be stored locally on the device and automatically synced with the cloud backend when connectivity is restored. This works by leveraging Cosmos DB’s multi-region replication and conflict resolution, ensuring data consistency across offline and online states. On the Microsoft Azure Data Fundamentals DP-900 exam, this scenario tests your understanding of which Azure service provides native offline support for mobile apps, often appearing as a trap where candidates mistakenly choose Azure Blob Storage or Azure SQL Database—Blob Storage lacks sync logic, and SQL Database is relational without offline-first features. A helpful memory tip is to think “Cosmos for mobile sync” because its flexible NoSQL model and SDK handle local storage and conflict resolution seamlessly, making it the go-to for offline-first mobile backends.
This DP-900 practice question tests your understanding of describe considerations for working with non-relational data on azure. 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.
A startup is building a mobile app that requires offline data synchronization. The app needs to store user-generated content locally on the device and sync with Azure when connectivity is available. Which Azure service should they use for the cloud backend?
Azure Cosmos DB
Supports offline data sync with the Azure Mobile Apps SDK.
Azure Blob Storage
Why wrong: No built-in offline sync for mobile apps.
Azure SQL Database
Why wrong: Relational database, not optimized for offline sync.
Azure Table Storage
Why wrong: Lacks offline sync capabilities.
Answer choices
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
Option B is correct because Azure Cosmos DB, combined with offline data sync (via Mobile Apps SDK), provides offline capabilities. Option A is wrong because Azure Blob Storage does not have built-in offline sync for mobile apps. Option C is wrong because Azure SQL Database is relational and not the best for offline sync scenarios. Option D is wrong because Azure Table Storage lacks robust offline sync support.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Azure Cosmos DB
Why this is correct
Supports offline data sync with the Azure Mobile Apps SDK.
Related concept
Read the scenario before looking for a memorised answer.
Azure Blob Storage
Why it's wrong here
No built-in offline sync for mobile apps.
Azure SQL Database
Why it's wrong here
Relational database, not optimized for offline sync.
Azure Table Storage
Why it's wrong here
Lacks offline sync capabilities.
Common exam traps
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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.
What to study next
Identify which DP-900 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
Describe considerations for working with non-relational data on Azure — This question tests Describe considerations for working with non-relational data on Azure — Read the scenario before looking for a memorised answer..
The correct answer is: Azure Cosmos DB — Option B is correct because Azure Cosmos DB, combined with offline data sync (via Mobile Apps SDK), provides offline capabilities. Option A is wrong because Azure Blob Storage does not have built-in offline sync for mobile apps. Option C is wrong because Azure SQL Database is relational and not the best for offline sync scenarios. Option D is wrong because Azure Table Storage lacks robust offline sync support.
Identify which DP-900 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 20, 2026
This DP-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 DP-900 exam.
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