Quick Answer
The answer is Azure Cache for Redis and Azure Cosmos DB. Azure Cache for Redis provides a global low-latency session store with automatic failover through its geo-replication feature, which asynchronously replicates data from a primary cache to a secondary cache in a paired region, ensuring sub-millisecond reads and writes for user session data. Azure Cosmos DB also meets these requirements with its multi-region writes and automatic failover capabilities, offering single-digit millisecond latency and 99.999% availability. On the DP-203 exam, this scenario tests your understanding of choosing between in-memory and NoSQL solutions for global session state, often appearing as a trap where candidates overlook Redis for session data in favor of only Cosmos DB. Remember the key distinction: Redis excels for ephemeral, high-throughput session caching, while Cosmos DB is better for persistent, schema-flexible data with global distribution. A helpful mnemonic is “Redis for rapid sessions, Cosmos for consistent collections.”
This DP-203 practice question tests your understanding of design and implement data 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.
A company is designing a data storage solution for a global application that requires low-latency reads and writes for user session data. The solution must support automatic failover across multiple Azure regions. Which TWO Azure services meet these requirements?
Azure Table Storage
Why wrong: Does not provide automatic cross-region failover.
Azure Cache for Redis
Supports geo-replication and automatic failover.
Azure Blob Storage
Why wrong: Does not support low-latency writes for session data.
Azure Cosmos DB
Supports multi-region writes and automatic failover.
Azure SQL Database
Why wrong: Does not support automatic multi-region failover without additional configuration.
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 Cache for Redis
Azure Cache for Redis is correct because it provides an in-memory data store with sub-millisecond latency for both reads and writes, making it ideal for user session data. It supports automatic failover across Azure regions through geo-replication, where data from a primary cache is asynchronously replicated to a secondary cache in a paired region, ensuring high availability and disaster recovery.
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 Table Storage
Why it's wrong here
Does not provide automatic cross-region failover.
Azure Cache for Redis
Why this is correct
Supports geo-replication and automatic failover.
Related concept
Read the scenario before looking for a memorised answer.
Azure Blob Storage
Why it's wrong here
Does not support low-latency writes for session data.
Azure Cosmos DB
Why this is correct
Supports multi-region writes and automatic failover.
Related concept
Read the scenario before looking for a memorised answer.
Azure SQL Database
Why it's wrong here
Does not support automatic multi-region failover without additional configuration.
Common exam traps
The trap here is that candidates often confuse Azure Cosmos DB's multi-region writes with the specific requirement for low-latency session data, but Cosmos DB, while supporting automatic failover, has higher latency than an in-memory cache like Redis for frequent, small reads and writes typical of session state.
Detailed technical explanation
Azure Cache for Redis uses the Redis protocol (RESP) and supports active geo-replication via the Enterprise tier, which uses conflict-free replicated data types (CRDTs) to allow writes in both regions with automatic conflict resolution. In a real-world scenario, a global e-commerce platform can use this to maintain user shopping cart sessions across regions, ensuring that a failover does not require re-authentication or data loss, as the cache remains consistent within seconds.
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 and implement data storage — This question tests Design and implement data storage — Read the scenario before looking for a memorised answer..
The correct answer is: Azure Cache for Redis — Azure Cache for Redis is correct because it provides an in-memory data store with sub-millisecond latency for both reads and writes, making it ideal for user session data. It supports automatic failover across Azure regions through geo-replication, where data from a primary cache is asynchronously replicated to a secondary cache in a paired region, ensuring high availability and disaster recovery.
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 11, 2026
This DP-203 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-203 exam.
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