- A
Azure Data Lake Storage Gen2
ADLS Gen2 combines a hierarchical namespace with POSIX ACLs and Blob API access. It is designed for large-scale analytics workloads and integrates with Spark and Hive.
- B
Azure Data Lake Storage Gen1
Why wrong: ADLS Gen1 also supports a hierarchical namespace and POSIX ACLs but uses the WebHDFS API, not the Blob API. Gen1 is being phased out in favor of Gen2.
- C
Azure Blob Storage
Why wrong: Standard Azure Blob Storage does not support a hierarchical namespace (unless the hierarchical namespace feature is enabled, which creates ADLS Gen2) and does not provide POSIX ACLs natively.
- D
Azure Files
Why wrong: Azure Files is a managed file share for SMB or NFS protocols. It is not designed for petabyte-scale analytics and does not support the Blob API.
AZ-305 Design data storage solutions Practice Question
This AZ-305 practice question tests your understanding of design data storage solutions. 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 building a petabyte-scale data lake for analytics. The workload includes Apache Spark and Hive jobs that read and write large files. The storage solution must support a hierarchical namespace for efficient directory operations, POSIX-like access control lists (ACLs) for fine-grained permissions, and must be accessible via the Azure Blob Storage API for compatibility with existing tools. Furthermore, the solution should be optimized for analytics workloads with high throughput. Which Azure data service should they choose?
Answer choices
Why each option matters
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
Azure Data Lake Storage Gen2 (ADLS Gen2) is the correct choice because it combines a hierarchical namespace with POSIX-like ACLs and is accessible via the Azure Blob Storage API. This service is specifically optimized for analytics workloads like Apache Spark and Hive, providing high throughput for petabyte-scale data lakes. The hierarchical namespace enables efficient directory operations, while the Blob Storage API ensures compatibility with existing tools.
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.
- ✓
Azure Data Lake Storage Gen2
Why this is correct
ADLS Gen2 combines a hierarchical namespace with POSIX ACLs and Blob API access. It is designed for large-scale analytics workloads and integrates with Spark and Hive.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Azure Data Lake Storage Gen1
Why it's wrong here
ADLS Gen1 also supports a hierarchical namespace and POSIX ACLs but uses the WebHDFS API, not the Blob API. Gen1 is being phased out in favor of Gen2.
- ✗
Azure Blob Storage
Why it's wrong here
Standard Azure Blob Storage does not support a hierarchical namespace (unless the hierarchical namespace feature is enabled, which creates ADLS Gen2) and does not provide POSIX ACLs natively.
- ✗
Azure Files
Why it's wrong here
Azure Files is a managed file share for SMB or NFS protocols. It is not designed for petabyte-scale analytics and does not support the Blob API.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse Azure Data Lake Storage Gen1 with Gen2, overlooking that Gen1 lacks Blob Storage API compatibility, or they may assume Azure Blob Storage with hierarchical namespace enabled is a separate service, but ADLS Gen2 is the specific offering that combines all required features.
Detailed technical explanation
How to think about this question
ADLS Gen2 implements a hierarchical namespace by extending Azure Blob Storage with a file system abstraction, allowing atomic directory rename and delete operations that avoid O(n) cost of flat namespace scans. POSIX ACLs in ADLS Gen2 support both access ACLs and default ACLs, enabling fine-grained permissions at the directory and file level, which is critical for multi-user analytics environments. The service achieves high throughput by leveraging Azure Blob Storage's distributed architecture and supporting parallel I/O patterns common in Spark and Hive jobs.
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.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this AZ-305 question test?
Design data storage solutions — This question tests Design data storage solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Azure Data Lake Storage Gen2 — Azure Data Lake Storage Gen2 (ADLS Gen2) is the correct choice because it combines a hierarchical namespace with POSIX-like ACLs and is accessible via the Azure Blob Storage API. This service is specifically optimized for analytics workloads like Apache Spark and Hive, providing high throughput for petabyte-scale data lakes. The hierarchical namespace enables efficient directory operations, while the Blob Storage API ensures compatibility with existing tools.
What should I do if I get this AZ-305 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.
About these practice questions
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Last reviewed: Jun 11, 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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