DP-203 Practice Question: Secure, monitor, and optimize data storage and data processing
Your company uses Azure Blob Storage to store backups. You need to ensure that data is encrypted at rest using a customer-managed key stored in Azure Key Vault. Which feature should you enable?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure Storage Service Encryption with customer-managed keys
Azure Storage Service Encryption (SSE) encrypts data at rest and supports customer-managed keys stored in Azure Key Vault. Option A is incorrect because Azure Purview is a data governance service, not for encryption. Option B is incorrect because Azure Disk Encryption is used for virtual machine disks, not Blob Storage. Option D is incorrect because Azure Information Protection is for classification and labeling. Therefore, option C is correct.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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Azure Purview
Why it's wrong here
Purview governs and catalogues data across sources; it does not perform encryption at rest. Blob Storage encryption with a customer-managed key requires configuring an encryption scope or account-level key sourced from Azure Key Vault. Purview would be the right choice for classifying sensitive backup data or mapping its lineage, not for controlling the encryption key.
- ✗
Azure Disk Encryption
Why it's wrong here
Azure Disk Encryption encrypts OS and data disks on IaaS virtual machines, not Blob Storage objects. Backups stored as blobs need an encryption scope or storage account key referencing Azure Key Vault. Disk Encryption would be correct for protecting a VM's attached volumes, but it cannot apply a customer-managed key to blob data.
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Azure Storage Service Encryption with customer-managed keys
Why this is correct
Storage Service Encryption with customer-managed keys wraps the account's data encryption key with a Key Vault key, so Microsoft cannot decrypt the backups. This satisfies the requirement for encryption at rest under your own key control, unlike platform-managed keys.
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Azure Information Protection
Why it's wrong here
Azure Information Protection classifies and labels documents, applying protection as they travel; it does not encrypt a storage account's data at rest. Blob encryption with a customer-managed key needs an encryption scope or account key backed by Azure Key Vault. Information Protection would suit labelling sensitive files, not securing stored backups.
Quick reference
Azure Blob Storage Tier Comparison
| Tier | Storage Cost | Retrieval Cost | Latency | Use Case |
|---|---|---|---|---|
| Hot | Highest | Lowest | Immediate | Active data, frequent reads |
| Cool | Lower | Higher | Immediate | Data accessed < once / month |
| Cold | Lower still | Higher | Immediate | Data accessed < once / quarter |
| Archive | Lowest | Highest + rehydration delay | Hours | Long-term compliance retention |
Go deeper
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.