The correct answer is to configure Azure Storage encryption with customer-managed keys in Azure Key Vault. This is because Azure Storage encryption, when paired with customer-managed keys (CMK), allows you to control the encryption keys used to protect data at rest in Azure Data Lake Storage Gen2, directly meeting the requirement for encrypting PII with your own keys. On the Microsoft Azure Data Engineer Associate DP-203 exam, this scenario tests your understanding of how CMK provides an extra security layer beyond Microsoft-managed keys, enabling you to manage key rotation, revocation, and access policies. A common trap is confusing CMK with Azure Disk Encryption or Transparent Data Encryption, but remember that for Azure Storage, including ADLS Gen2, the native encryption feature is what you enable, and you simply specify your own key in Key Vault. Memory tip: Think “Storage + Key Vault = CMK control” to distinguish it from other encryption methods.
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.
You are designing a data lake on Azure Data Lake Storage Gen2. The data includes customer PII that must be encrypted at rest using customer-managed keys. Which feature should you enable?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure Azure Storage encryption with customer-managed keys in Azure Key Vault
Option B is correct because Azure Storage encryption with customer-managed keys (CMK) in Azure Key Vault allows you to control the encryption keys used to encrypt data at rest in Azure Data Lake Storage Gen2. This meets the requirement for encrypting PII with customer-managed keys, as CMK provides an extra layer of security by letting you manage key rotation, revocation, and 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.
✗
Enable double encryption for Azure Storage
Why it's wrong here
A is wrong because double encryption uses Microsoft-managed keys for infrastructure encryption.
✓
Configure Azure Storage encryption with customer-managed keys in Azure Key Vault
Why this is correct
C is correct because customer-managed keys in Key Vault allow you to control encryption keys.
Related concept
Read the scenario before looking for a memorised answer.
✗
Enable infrastructure encryption
Why it's wrong here
B is wrong because infrastructure encryption uses Microsoft-managed keys.
✗
Use Azure Customer Lockbox for access control
Why it's wrong here
D is wrong because Customer Lockbox controls access to data, not encryption.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse 'double encryption' or 'infrastructure encryption' with customer-managed key control, but only CMK gives you direct ownership of the encryption keys for data at rest.
Detailed technical explanation
How to think about this question
Under the hood, Azure Storage encryption with CMK uses envelope encryption: a data encryption key (DEK) encrypts the data, and the DEK is encrypted by a key encryption key (KEK) stored in Azure Key Vault. This allows you to revoke access by disabling the KEK, effectively making the data inaccessible. In a real-world scenario, if a compliance requirement mandates key rotation every 90 days, CMK enables you to automate this via Key Vault policies without re-encrypting the data.
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 Azure Storage encryption with customer-managed keys in Azure Key Vault — Option B is correct because Azure Storage encryption with customer-managed keys (CMK) in Azure Key Vault allows you to control the encryption keys used to encrypt data at rest in Azure Data Lake Storage Gen2. This meets the requirement for encrypting PII with customer-managed keys, as CMK provides an extra layer of security by letting you manage key rotation, revocation, and 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.
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Question Discussion
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