The answer is to deploy Azure Front Door for routing read requests to the nearest region and to use read-access geo-redundant storage (RA-GRS) for the data lake. This combination works because RA-GRS replicates your data asynchronously to a secondary paired region, providing a read-only endpoint that satisfies data residency requirements by keeping the secondary within the same geography, while Azure Front Door intelligently directs users to the lowest-latency endpoint for reads, ensuring fast multi-region read access without granting write permissions to the secondary. On the DP-203 exam, this scenario tests your understanding of how to balance performance with compliance, often appearing as a trap where candidates mistakenly choose a writable geo-replication option like GRS or GZRS, forgetting that only one region needs write access. A common memory tip is “Front Door for speed, RA-GRS for read-only compliance”—if you need low-latency reads across regions but must lock writes to one region, always pair a read-only replication tier with a global load balancer.
DP-203 Global data lake with low latency Practice Question
This DP-203 practice question tests your understanding of design and implement data storage. 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 multinational corporation is designing a data lake on Azure Data Lake Storage Gen2. The data must be accessible from multiple regions with low latency, but only one region needs writable access. The solution must also comply with data residency requirements. Which two features or configurations should be implemented? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use read-access geo-redundant storage (RA-GRS)
B is correct because read-access geo-redundant storage (RA-GRS) provides a secondary read-only endpoint in a paired region, enabling low-latency reads from multiple regions while maintaining a single writable primary region. This meets the data residency requirement because the secondary region is within the same geography, and RA-GRS ensures data is replicated asynchronously without allowing writes to the secondary.
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.
✗
Enable hierarchical namespace on the storage account
Why it's wrong here
Hierarchical namespace is a feature of ADLS Gen2 but does not provide multi-region low-latency reads or data residency.
✗
Configure geo-replication with manual failover
Why it's wrong here
Manual failover does not provide automatic read access from secondary regions; it requires a manual process to promote the secondary.
✗
Use Azure Data Lake Storage Gen2 with locally redundant storage (LRS)
Why it's wrong here
LRS does not replicate data to another region, so it cannot provide multi-region low-latency reads.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The DP-203 exam frequently reuses these exact scenarios with slightly different constraints.
✓Use read-access geo-redundant storage (RA-GRS)Correct answer▾✗Enable hierarchical namespace on the storage accountWrong answer — click to see why▾
Why this is wrong here
Hierarchical namespace is a feature of ADLS Gen2 but does not provide multi-region low-latency reads or data residency.
✗Configure geo-replication with manual failoverWrong answer — click to see why▾
Why this is wrong here
Manual failover does not provide automatic read access from secondary regions; it requires a manual process to promote the secondary.
✗Use Azure Data Lake Storage Gen2 with locally redundant storage (LRS)Wrong answer — click to see why▾
Why this is wrong here
LRS does not replicate data to another region, so it cannot provide multi-region low-latency reads.
Analysis generated from the official DP-203blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse RA-GRS with GRS or fail to recognize that RA-GRS provides a read-only secondary endpoint, which is essential for low-latency reads without compromising the single-writable-region requirement.
Detailed technical explanation
How to think about this question
RA-GRS replicates data synchronously three times within the primary region and asynchronously three times to a paired secondary region, providing a separate read-only endpoint (e.g., `*.secondary.blob.core.windows.net`). For Azure Data Lake Storage Gen2, RA-GRS is supported but note that the hierarchical namespace does not affect replication; the secondary endpoint serves blob data with eventual consistency, which is acceptable for read-heavy workloads. In a real-world scenario, combining RA-GRS with Azure Front Door (option C) allows intelligent routing of read requests to the nearest endpoint, reducing latency for global users while keeping writes confined to the primary region.
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 DP-203 question in full detail.
Design and implement data storage — This question tests Design and implement data storage — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use read-access geo-redundant storage (RA-GRS) — B is correct because read-access geo-redundant storage (RA-GRS) provides a secondary read-only endpoint in a paired region, enabling low-latency reads from multiple regions while maintaining a single writable primary region. This meets the data residency requirement because the secondary region is within the same geography, and RA-GRS ensures data is replicated asynchronously without allowing writes to the secondary.
What should I do if I get this DP-203 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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