Quick Answer
Azure Data Lake Storage Gen2 (ADLS Gen2) is the correct choice because it uniquely combines a hierarchical namespace with POSIX-like access control lists (ACLs), enabling fine-grained file-level access control essential for healthcare compliance. This architecture allows you to set permissions on individual files or directories, while Azure Storage Service Encryption secures data at rest and TLS 1.2+ protects data in transit, all natively integrated with Microsoft Purview for automated data lineage and cataloging. On the DP-203 exam, this scenario tests your understanding that ADLS Gen2 is the only Azure storage solution offering both ACL-based file-level security and Purview integration, often appearing as a distractor against Azure Blob Storage (which lacks hierarchical namespace) or Azure SQL Database (which is not a data lake). A common trap is assuming Blob Storage supports similar granularity, but remember: no hierarchical namespace means no file-level ACLs. Memory tip: think “Gen2 for granularity and governance” — the “2” reminds you of the two key differentiators: hierarchical namespace and Purview integration.
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.
You are designing a data lake architecture for a healthcare company. The solution must support fine-grained access control at the file level, encryption at rest and in transit, and integration with Microsoft Purview for data lineage. Which storage solution should you recommend?
Azure NetApp Files.
Why wrong: NetApp Files is for high-performance NFS, lacks Purview integration.
Azure Files.
Why wrong: Azure Files is for SMB file shares, not data lake analytics.
Azure Data Lake Storage Gen2 (ADLS Gen2).
ADLS Gen2 provides ACLs, encryption, and Purview integration.
Azure Blob Storage.
Why wrong: Blob Storage does not support file-level ACLs.
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 Data Lake Storage Gen2 (ADLS Gen2).
Azure Data Lake Storage Gen2 (ADLS Gen2) is the correct choice because it combines a hierarchical namespace with POSIX-like access control lists (ACLs) for fine-grained file-level permissions, supports encryption at rest (Azure Storage Service Encryption) and in transit (TLS 1.2+), and natively integrates with Microsoft Purview for automated data lineage and cataloging. This makes it ideal for healthcare scenarios requiring strict compliance and auditability.
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 NetApp Files.
Why it's wrong here
NetApp Files is for high-performance NFS, lacks Purview integration.
Azure Files.
Why it's wrong here
Azure Files is for SMB file shares, not data lake analytics.
Azure Data Lake Storage Gen2 (ADLS Gen2).
Why this is correct
ADLS Gen2 provides ACLs, encryption, and Purview integration.
Related concept
Read the scenario before looking for a memorised answer.
Azure Blob Storage.
Why it's wrong here
Blob Storage does not support file-level ACLs.
Common exam traps
The trap here is that candidates often confuse Azure Blob Storage with ADLS Gen2, assuming blob storage's container-level permissions are sufficient for file-level control, but the hierarchical namespace and POSIX ACLs are exclusive to ADLS Gen2 and required for the fine-grained access described.
Detailed technical explanation
ADLS Gen2 implements a hierarchical namespace by extending Azure Blob Storage with a file system abstraction, allowing directories and files to inherit permissions via ACLs (up to 32 ACL entries per file/directory). Under the hood, it uses Azure Active Directory (Azure AD) for RBAC and POSIX ACLs for granular control, with encryption at rest using 256-bit AES and in transit via TLS 1.2. In a real-world healthcare scenario, this enables a data lake where researchers can access de-identified datasets while clinicians see only their patients' records, with Purview automatically capturing lineage from ingestion to consumption.
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 Data Lake Storage Gen2 (ADLS Gen2). — Azure Data Lake Storage Gen2 (ADLS Gen2) is the correct choice because it combines a hierarchical namespace with POSIX-like access control lists (ACLs) for fine-grained file-level permissions, supports encryption at rest (Azure Storage Service Encryption) and in transit (TLS 1.2+), and natively integrates with Microsoft Purview for automated data lineage and cataloging. This makes it ideal for healthcare scenarios requiring strict compliance and auditability.
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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Same concept, more angles
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Which TWO features are available in Azure Data Lake Storage Gen2 but not in Azure Blob Storage? (Choose two.)
easyWhy A: Azure Data Lake Storage Gen2 (ADLS Gen2) extends Azure Blob Storage by adding a hierarchical namespace, which organizes objects into a directory structure similar to a file system. This enables efficient directory-level operations (e.g., renaming or deleting a directory in O(1) time) and supports POSIX-compliant access control lists (ACLs) for fine-grained permissions. These two features are not available in standard Azure Blob Storage, which uses a flat namespace and only supports container-level access policies.
Variation 2. Which Azure storage solution is best suited for storing large volumes of unstructured data, such as log files and media files, and supports both hierarchical namespace and POSIX-like access control lists?
easyWhy B: Azure Data Lake Storage Gen2 (ADLS Gen2) combines a hierarchical namespace with POSIX-like access control lists (ACLs) on top of Azure Blob Storage. This makes it ideal for storing large volumes of unstructured data (e.g., log files, media files) while supporting fine-grained, POSIX-compliant permissions and directory-level operations that are essential for big data analytics workloads.
Last reviewed: Jun 24, 2026
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