The correct answer is to enable Azure Storage Service Encryption with a customer-managed key stored in Azure Key Vault. This ensures that the medical images in Azure Blob Storage are encrypted at rest using a key you control, while Key Vault’s logging and monitoring features provide the necessary auditing of key access. On the DP-900 exam, this question tests your understanding of encryption responsibilities: Azure Storage always encrypts data at rest by default with Microsoft-managed keys, but switching to customer-managed keys (CMK) gives you control and auditability. A common trap is confusing Blob Storage encryption with Azure Disk Encryption (for VM disks) or Azure SQL Database TDE (for relational databases), both of which are incorrect here. Remember the memory tip: “Blobs need Key Vault, not disks or SQL”—if the data lives in Blob Storage, think Azure Storage Service Encryption plus CMK in Key Vault for audit control.
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.
A hospital stores medical images in Azure Blob Storage. They must ensure that images are encrypted at rest using customer-managed keys (CMK) and that access to the keys is audited. What should you implement?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable Azure Storage Service Encryption with a customer-managed key in Azure Key Vault.
Azure Storage encryption with customer-managed keys stored in Azure Key Vault provides the required control and auditing. Option B is wrong because Azure Disk Encryption is for VMs, not Blob Storage. Option C is wrong because Azure Information Protection is for classification, not encryption at rest. Option D is wrong because Azure SQL Database TDE is for SQL databases.
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.
✗
Use Azure Disk Encryption to encrypt the storage account.
Why it's wrong here
Disk Encryption is for virtual machine disks, not for Blob Storage.
✗
Apply Azure Information Protection labels to the blobs.
Why it's wrong here
Information Protection is for classification, not encryption at rest.
✓
Enable Azure Storage Service Encryption with a customer-managed key in Azure Key Vault.
Why this is correct
This provides encryption at rest with CMK and allows auditing via Key Vault logs.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use Transparent Data Encryption (TDE) on the storage account.
Why it's wrong here
TDE is a feature of SQL databases, not Azure Storage.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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-900 question in full detail.
Identify which DP-900 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Describe considerations for working with non-relational data on Azure — This question tests Describe considerations for working with non-relational data on Azure — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable Azure Storage Service Encryption with a customer-managed key in Azure Key Vault. — Azure Storage encryption with customer-managed keys stored in Azure Key Vault provides the required control and auditing. Option B is wrong because Azure Disk Encryption is for VMs, not Blob Storage. Option C is wrong because Azure Information Protection is for classification, not encryption at rest. Option D is wrong because Azure SQL Database TDE is for SQL databases.
What should I do if I get this DP-900 question wrong?
Identify which DP-900 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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