The correct actions to secure data at rest in Azure Data Lake Storage Gen2 are enabling customer-managed keys in Azure Key Vault and configuring firewall and virtual network rules. Customer-managed keys provide an additional, independent encryption layer for data at rest, allowing you to control and rotate your own encryption keys rather than relying solely on Azure-managed keys, which is critical for meeting compliance and security policies. Firewall and virtual network rules restrict network-level access to the storage account, preventing unauthorized traffic from reaching the data at rest and complementing encryption by controlling who can even attempt to access the data. On the DP-203 exam, this question tests your understanding of defense-in-depth for Azure Storage, often appearing as a multi-select scenario where you must distinguish between network controls and key management—common traps include confusing Azure-managed keys with customer-managed keys or overlooking firewall rules as a data-at-rest control. Memory tip: think "lock and key"—firewalls lock the door, customer-managed keys control the lock.
DP-203 Design and implement data storage Practice Question
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 actions should be taken to secure data at rest in Azure Data Lake Storage Gen2?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure firewall and virtual network rules
Option B is correct because configuring firewall and virtual network rules restricts network-level access to the storage account, preventing unauthorized traffic from reaching the data at rest. Option C is correct because enabling customer-managed keys (CMK) in Azure Key Vault provides an additional encryption layer for data at rest, allowing you to control and rotate encryption keys independently of Azure-managed keys.
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 soft delete for blobs
Why it's wrong here
Protects against accidental deletion, not security.
✓
Configure firewall and virtual network rules
Why this is correct
Restricts network access to storage.
Related concept
Read the scenario before looking for a memorised answer.
Client-side is not a built-in Azure feature for ADLS; it's possible but not a typical Azure recommendation.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing data protection mechanisms (soft delete, RBAC, client-side encryption) with the specific Azure-native controls for securing data at rest (network isolation and encryption key management).
Detailed technical explanation
How to think about this question
Azure Data Lake Storage Gen2 encrypts data at rest by default using Azure-managed keys (SSE). Enabling customer-managed keys (CMK) with Azure Key Vault allows you to bring your own key (BYOK) and control key rotation, revocation, and auditing via Key Vault logs. Firewall and virtual network rules use Azure's network security layer to block all traffic except from specified VNets or IP ranges, effectively creating a private network boundary for the storage account.
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: Configure firewall and virtual network rules — Option B is correct because configuring firewall and virtual network rules restricts network-level access to the storage account, preventing unauthorized traffic from reaching the data at rest. Option C is correct because enabling customer-managed keys (CMK) in Azure Key Vault provides an additional encryption layer for data at rest, allowing you to control and rotate encryption keys independently of Azure-managed keys.
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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