Secure, monitor, and optimize data storage and data processing →mediumMultiple ChoiceObjective-mapped
DP-203 Practice Question: Secure, monitor, and optimize data storage and data processing
Your company uses Azure Data Lake Storage Gen2 for a data lake. You need to implement a security strategy that meets the following requirements: 1) All data must be encrypted at rest using customer-managed keys stored in Azure Key Vault. 2) Access to the storage account must be restricted to specific virtual networks. 3) Users must authenticate using Microsoft Entra ID and be granted read-only access to the 'landing' container. You have configured the storage account with Azure Storage Service Encryption (SSE) using customer-managed keys. You have also configured firewall rules to allow access only from the required virtual network. However, users cannot access the 'landing' container even though they have the Storage Blob Data Reader role. What is the most likely issue?
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
✓
The Key Vault firewall is blocking access from the storage account
The most likely issue is that the Key Vault firewall is blocking access from the storage account. When using Azure Storage Service Encryption (SSE) with customer-managed keys, the storage account must be able to access the Key Vault to wrap and unwrap the encryption key. Even though the users have the Storage Blob Data Reader role and the storage account firewall allows the virtual network, if the Key Vault firewall does not permit access from the storage account (e.g., via 'Allow trusted Microsoft services' or a specific network rule), the storage service cannot decrypt the data, resulting in access failures. Option D correctly identifies this. Options A and B are incorrect because the users have the correct RBAC role and the role is effective at the storage account level; the issue is not with user permissions but with the storage account's ability to reach the Key Vault. Option C is incorrect because the firewall rules are correctly configured for the virtual network.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The users have not been granted access to the Key Vault
Why it's wrong here
Users don't need direct Key Vault access; storage account does.
- ✗
The users do not have the Storage Blob Data Reader role assigned at the container scope
Why it's wrong here
Role assignment is correct.
- ✗
The firewall is blocking the users' IP addresses even though they are in the virtual network
Why it's wrong here
Firewall allows the virtual network.
- ✓
The Key Vault firewall is blocking access from the storage account
Why this is correct
Key Vault firewall must allow Azure services or specific storage account.
Quick reference
Access Control Model Comparison
| Model | Acronym | Who Controls Access? | Best For |
|---|---|---|---|
| Discretionary Access Control | DAC | Resource owner | Small teams, file shares |
| Mandatory Access Control | MAC | System / security labels | Classified govt / military |
| Role-Based Access Control | RBAC | Administrator (via roles) | Enterprise environments |
| Attribute-Based Access Control | ABAC | Policy engine (user + resource attributes) | Fine-grained, dynamic policies |
| Rule-Based Access Control | RuBAC | System rules / ACLs | Firewall rules, network ACLs |
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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.