The answer is that Blob Storage supports lifecycle management policies, while ADLS Gen2 offers a hierarchical namespace and POSIX-like permissions, making these three the valid considerations when comparing Azure Blob Storage and Data Lake Storage Gen2 for a big data analytics workload. This is correct because ADLS Gen2 builds on Blob Storage by adding a hierarchical namespace for efficient directory operations and POSIX-compliant access control lists, which are essential for big data frameworks like Hadoop, whereas Blob Storage’s flat namespace is simpler but lacks these features. On the DP-900 exam, this question tests your understanding of when to choose each service for analytics, often appearing as a trap where candidates assume lifecycle management is exclusive to Blob Storage—but both services support it. A common memory tip is to remember that ADLS Gen2 is Blob Storage with a “hierarchy and POSIX” upgrade, so focus on the namespace and permissions as the differentiators, not lifecycle policies.
DP-900 Practice Question: Describe considerations for working with non-relational data on Azure
This DP-900 practice question tests your understanding of describe considerations for working with non-relational data on azure. 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 THREE of the following are valid considerations when choosing between Azure Blob Storage and Azure Data Lake Storage Gen2 for a big data analytics workload?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
ADLS Gen2 can be optimized for high-throughput analytics workloads
ADLS Gen2 supports a hierarchical namespace, POSIX-like permissions, and is cost-effective for both hot and cool tiers. Blob Storage lacks hierarchical namespace by default. Both support lifecycle management. ADLS Gen2 can be used with Blob APIs but also has additional features.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
ADLS Gen2 can be optimized for high-throughput analytics workloads
Why this is correct
ADLS Gen2 is designed for big data analytics with high throughput.
Related concept
Standard ACLs match source addresses.
✓
ADLS Gen2 supports a hierarchical namespace for folder-level organization
Why this is correct
Hierarchical namespace is a key feature of ADLS Gen2 that Blob Storage does not have by default.
Related concept
Standard ACLs match source addresses.
✗
Blob Storage provides POSIX-compliant access control lists (ACLs)
Why it's wrong here
POSIX ACLs are a feature of ADLS Gen2, not Blob Storage.
✗
ADLS Gen2 cannot use Blob Storage APIs
Why it's wrong here
ADLS Gen2 is built on Blob Storage and supports Blob APIs in addition to its own.
Both Blob Storage and ADLS Gen2 support lifecycle management policies.
Related concept
Standard ACLs match source addresses.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
How this comes up in practice
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this DP-900 question in full detail.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DP-900 ACL questions on filtering logic and placement.
Describe considerations for working with non-relational data on Azure — This question tests Describe considerations for working with non-relational data on Azure — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: ADLS Gen2 can be optimized for high-throughput analytics workloads — ADLS Gen2 supports a hierarchical namespace, POSIX-like permissions, and is cost-effective for both hot and cool tiers. Blob Storage lacks hierarchical namespace by default. Both support lifecycle management. ADLS Gen2 can be used with Blob APIs but also has additional features.
What should I do if I get this DP-900 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DP-900 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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