The correct answer is to use Azure Storage Service Encryption (SSE) with customer-managed keys (CMK) in Azure Key Vault. This method secures data at rest in Azure Data Lake Storage Gen2 by encrypting all written data with a key that you control and can rotate independently, adding a critical layer of separation between the encryption key and the encrypted data. On the Microsoft Azure Data Engineer Associate DP-203 exam, this concept tests your understanding that SSE is always enabled by default with Microsoft-managed keys, but the question specifically asks for valid methods to *secure* data—meaning you must know that using CMK is the only way to meet compliance or security policies requiring key ownership. A common trap is confusing client-side encryption with server-side options; remember that SSE with CMK is the only server-side method that gives you key control without additional application overhead. Memory tip: think "SSE + CMK = You hold the key to the kingdom."
DP-203 Design and implement data security Practice Question
This DP-203 practice question tests your understanding of design and implement data security. 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 of the following are valid methods 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
✓
Use customer-managed keys in Azure Key Vault
Option C is correct because using customer-managed keys (CMK) in Azure Key Vault allows you to control and rotate the encryption keys used for Azure Storage Service Encryption (SSE), providing an additional layer of security for data at rest. This is a valid method to secure data at rest in Azure Data Lake Storage Gen2, as it ensures that only authorized parties with access to the key vault can decrypt the data.
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.
✗
Assign RBAC roles for data access
Why it's wrong here
RBAC controls authorization, not encryption.
✗
Configure storage firewall rules
Why it's wrong here
Firewall restricts access, but does not encrypt data at rest.
✓
Use customer-managed keys in Azure Key Vault
Why this is correct
Customer-managed keys provide additional control over encryption.
Related concept
Read the scenario before looking for a memorised answer.
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse access control methods (RBAC, firewalls) or transport security (TLS) with data at rest encryption, mistakenly thinking they secure the stored data itself, when in fact only encryption mechanisms like SSE or CMK protect data at rest.
Detailed technical explanation
How to think about this question
Azure Storage Service Encryption (SSE) is enabled by default for all storage accounts, including Azure Data Lake Storage Gen2, and encrypts data at rest using 256-bit AES encryption. When using customer-managed keys, the encryption key hierarchy involves a key encryption key (KEK) stored in Azure Key Vault that wraps the data encryption key (DEK), allowing for key rotation and revocation without re-encrypting all data. In a real-world scenario, organizations subject to compliance standards like PCI DSS or HIPAA often require customer-managed keys to meet key management and audit requirements.
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 security — This question tests Design and implement data security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use customer-managed keys in Azure Key Vault — Option C is correct because using customer-managed keys (CMK) in Azure Key Vault allows you to control and rotate the encryption keys used for Azure Storage Service Encryption (SSE), providing an additional layer of security for data at rest. This is a valid method to secure data at rest in Azure Data Lake Storage Gen2, as it ensures that only authorized parties with access to the key vault can decrypt the data.
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 →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This DP-203 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 DP-203 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.