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.
You are designing a globally distributed application that requires low-latency reads and writes for a web application with user session data. The solution must support multi-master writes and provide 99.999% availability. Which Azure data service meets these requirements?
Azure SQL Database
Why wrong: SQL Database does not support multi-master writes.
Azure Cosmos DB
Cosmos DB supports multi-region writes and 99.999% SLA.
Azure Cache for Redis
Why wrong: Redis is a cache, not a fully durable data store.
Azure Table Storage
Why wrong: Table Storage does not support multi-master writes.
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
Azure Cosmos DB is the correct choice because it natively supports multi-master writes across multiple regions, enabling low-latency reads and writes globally. It offers a 99.999% availability SLA when configured with multiple write regions, and its turnkey global distribution ensures user session data is replicated with consistency options tailored for web applications.
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 SQL Database
Why it's wrong here
SQL Database does not support multi-master writes.
Azure Cosmos DB
Why this is correct
Cosmos DB supports multi-region writes and 99.999% SLA.
Related concept
Read the scenario before looking for a memorised answer.
Azure Cache for Redis
Why it's wrong here
Redis is a cache, not a fully durable data store.
Azure Table Storage
Why it's wrong here
Table Storage does not support multi-master writes.
Common exam traps
The trap here is that candidates often confuse Azure Cache for Redis's low-latency caching with a durable, multi-master data store, overlooking that it lacks persistence guarantees and multi-master write support required for 99.999% availability.
Detailed technical explanation
Cosmos DB achieves multi-master writes through its multi-region writes feature, which uses a conflict resolution policy (e.g., last-writer-wins with a custom timestamp or custom conflict resolution) to handle concurrent updates across regions. Under the hood, it leverages a globally distributed, multi-tenant database engine with automatic failover and a 99.999% SLA that requires at least two regions configured for writes. In a real-world scenario, a social media platform with users worldwide would use Cosmos DB to ensure session data is written and read from the nearest region, with conflicts resolved transparently.
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
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FAQ
Design data storage solutions — This question tests Design data storage solutions — Read the scenario before looking for a memorised answer..
The correct answer is: Azure Cosmos DB — Azure Cosmos DB is the correct choice because it natively supports multi-master writes across multiple regions, enabling low-latency reads and writes globally. It offers a 99.999% availability SLA when configured with multiple write regions, and its turnkey global distribution ensures user session data is replicated with consistency options tailored for web applications.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
This AZ-305 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-305 exam.
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