The correct answer is to enable immutable storage with a time-based retention policy on the curated zone container. This works because Azure Data Lake Storage Gen2 supports container-level WORM (Write Once, Read Many) policies, which lock data so it cannot be modified or deleted—even by administrators—until the retention period expires, directly meeting compliance requirements for the curated zone while leaving the landing zone container unaffected and modifiable. On the DP-203 exam, this scenario tests your understanding of immutable storage as a compliance feature distinct from role-based access control (RBAC) or soft delete, which can be overridden by privileged users. A common trap is assuming a lifecycle management policy or Azure Policy alone provides immutability, but only container-level WORM policies guarantee true data immutability. Memory tip: think "WORM for WORMholes"—immutable storage seals data in a time-locked vault, while other zones remain open for editing.
DP-203 Design and implement data storage Practice Question
This DP-203 practice question tests your understanding of design and implement data storage. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Your organization is implementing a data lake using Azure Data Lake Storage Gen2. You have a folder structure like '/data/landing/' for raw data and '/data/curated/' for cleaned data. The data is ingested daily from various sources. You need to ensure that data in the curated zone is immutable and cannot be modified or deleted by anyone, including administrators, for compliance reasons. However, data in the landing zone should be modifiable. What should you do?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable immutable storage with a time-based retention policy on the curated zone container
Option A is correct because Azure Data Lake Storage Gen2 supports immutable storage at the container level, which enforces a time-based retention policy that prevents any data from being modified or deleted—even by administrators—until the retention period expires. This directly meets the compliance requirement for the curated zone, while leaving the landing zone container unaffected and modifiable.
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 immutable storage with a time-based retention policy on the curated zone container
Why this is correct
Immutable storage prevents any modification or deletion until the retention period expires.
Related concept
Read the scenario before looking for a memorised answer.
✗
Remove the 'Delete' permission from the storage account key
Why it's wrong here
This does not prevent overwrites or modifications via other methods.
✗
Set ACLs on the curated zone folder to deny write and delete for all users
Why it's wrong here
ACLs can be changed by users with write permission on the ACL.
✗
Use Azure RBAC to deny delete and write permissions for all users on the curated zone folder
Why it's wrong here
RBAC can be bypassed by administrators with Owner role.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume ACLs or RBAC alone can enforce immutability, but they fail to recognize that only container-level immutable storage provides the WORM guarantee that cannot be overridden by administrators or privileged accounts.
Detailed technical explanation
How to think about this question
Immutable storage in Azure Data Lake Storage Gen2 uses a WORM (Write Once, Read Many) model enforced at the container level via a time-based retention policy or legal hold. Under the hood, Azure Blob Storage applies a retention lock that prevents any blob version from being deleted or overwritten, and once the lock is set to 'locked' mode, it cannot be removed—even by Microsoft support—ensuring compliance with regulations like SEC 17a-4(f). In a real-world scenario, you would enable immutable storage on the 'curated' container with a retention period matching your compliance requirements, while the 'landing' container remains mutable for daily ingestion.
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: Enable immutable storage with a time-based retention policy on the curated zone container — Option A is correct because Azure Data Lake Storage Gen2 supports immutable storage at the container level, which enforces a time-based retention policy that prevents any data from being modified or deleted—even by administrators—until the retention period expires. This directly meets the compliance requirement for the curated zone, while leaving the landing zone container unaffected and modifiable.
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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