- A
Hierarchical namespace
Hierarchical namespace is a core feature of ADLS Gen2 that organizes objects into directories, which is not available in Blob Storage's flat namespace.
- B
Immutable storage
Why wrong: Immutable storage is available in both Blob Storage and ADLS Gen2, so it is not exclusive to ADLS Gen2.
- C
Soft delete for blobs
Why wrong: Soft delete for blobs is a feature available in both services, not exclusive to ADLS Gen2.
- D
Lifecycle management policies
Why wrong: Lifecycle management policies are supported in both Blob Storage and ADLS Gen2, so not exclusive.
- E
POSIX-compliant access control lists
POSIX-compliant ACLs are a key differentiator of ADLS Gen2, providing fine-grained permissions not available in Blob Storage.
Question 270 of 851
ADLS Gen2 vs Blob Storage — Hierarchical Namespace & POSIX ACLs
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.
Which TWO features are available in Azure Data Lake Storage Gen2 but not in Azure Blob Storage? (Choose two.)
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
✓
Hierarchical namespace
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.
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.
- ✓
Hierarchical namespace
Why this is correct
Hierarchical namespace is a core feature of ADLS Gen2 that organizes objects into directories, which is not available in Blob Storage's flat namespace.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Immutable storage
Why it's wrong here
Immutable storage is available in both Blob Storage and ADLS Gen2, so it is not exclusive to ADLS Gen2.
- ✗
Soft delete for blobs
Why it's wrong here
Soft delete for blobs is a feature available in both services, not exclusive to ADLS Gen2.
- ✗
Lifecycle management policies
Why it's wrong here
Lifecycle management policies are supported in both Blob Storage and ADLS Gen2, so not exclusive.
- ✓
POSIX-compliant access control lists
Why this is correct
POSIX-compliant ACLs are a key differentiator of ADLS Gen2, providing fine-grained permissions not available in Blob Storage.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume features like soft delete or lifecycle management are exclusive to ADLS Gen2, when in fact they are shared with Blob Storage, while the hierarchical namespace and POSIX ACLs are the true differentiators.
Detailed technical explanation
How to think about this question
The hierarchical namespace in ADLS Gen2 is implemented as a filesystem abstraction over the blob storage backend, allowing atomic directory rename operations via the REST API (e.g., `Path - Update` with `Rename` action). POSIX ACLs in ADLS Gen2 support both access ACLs and default ACLs, with up to 32 ACE entries per file or directory, enabling fine-grained control for Linux-based workloads like Apache Spark or Hive. In contrast, Azure Blob Storage uses a flat namespace where all objects exist at the same level, and access control is limited to shared access signatures (SAS) or container-level permissions.
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.
Visual reference
Quick reference
Azure Blob Storage Tier Comparison
| Tier | Storage Cost | Retrieval Cost | Latency | Use Case |
|---|---|---|---|---|
| Hot | Highest | Lowest | Immediate | Active data, frequent reads |
| Cool | Lower | Higher | Immediate | Data accessed < once / month |
| Cold | Lower still | Higher | Immediate | Data accessed < once / quarter |
| Archive | Lowest | Highest + rehydration delay | Hours | Long-term compliance retention |
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this DP-203 question test?
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: Hierarchical namespace — 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.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
1 more ways this is tested on DP-203
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 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?
easy- A.Azure Blob Storage
- ✓ B.Azure Data Lake Storage Gen2
- C.Azure Files
- D.Azure SQL Database
Why 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.
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Last reviewed: Jun 24, 2026
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