- A
Enable 'Secure transfer required' on the storage account
Why wrong: Enabling 'Secure transfer required' enforces HTTPS, which encrypts data in transit using Microsoft-managed keys, not customer-managed keys. Therefore, it does not meet the requirement.
- B
Configure a service endpoint and a firewall rule to restrict access to Azure Databricks
Why wrong: Configuring a service endpoint and firewall rule restricts network access but does not provide encryption with customer-managed keys.
- C
Create a customer-managed key in Azure Key Vault and assign it to the storage account for encryption
Creating a customer-managed key in Azure Key Vault and assigning it to the storage account enables Azure Storage encryption with a customer-managed key. While primarily for at-rest encryption, it is the only option that satisfies the requirement for customer-managed keys.
- D
Set the minimum TLS version to 1.2 on the storage account
Why wrong: Setting the minimum TLS version to 1.2 enforces HTTPS with Microsoft-managed keys, not customer-managed keys.
DP-203 Customer-managed keys (CMK) Practice Question
This DP-203 practice question tests your understanding of design and implement data security. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. A key principle to apply: customer-managed keys (CMK). 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 solution in Azure that requires all data in transit between Azure Databricks and Azure Storage to be encrypted using a customer-managed key. Which configuration meets this requirement?
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
Create a customer-managed key in Azure Key Vault and assign it to the storage account for encryption
Option C is correct because enabling Azure Storage encryption with a customer-managed key from Azure Key Vault is the only option that uses a customer-managed key. Although this encryption applies to data at rest, the question's requirement for customer-managed keys cannot be fully met for data in transit since Azure does not support customer-managed keys for TLS. However, among the options, only C involves customer-managed keys, making it the best answer.
Key principle: Customer-managed keys (CMK)
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 'Secure transfer required' on the storage account
Why it's wrong here
Enabling 'Secure transfer required' enforces HTTPS, which encrypts data in transit using Microsoft-managed keys, not customer-managed keys. Therefore, it does not meet the requirement.
- ✗
Configure a service endpoint and a firewall rule to restrict access to Azure Databricks
Why it's wrong here
Configuring a service endpoint and firewall rule restricts network access but does not provide encryption with customer-managed keys.
- ✓
Create a customer-managed key in Azure Key Vault and assign it to the storage account for encryption
Why this is correct
Creating a customer-managed key in Azure Key Vault and assigning it to the storage account enables Azure Storage encryption with a customer-managed key. While primarily for at-rest encryption, it is the only option that satisfies the requirement for customer-managed keys.
Related concept
Customer-managed keys (CMK)
- ✗
Set the minimum TLS version to 1.2 on the storage account
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap is that candidates may select 'Secure transfer required' (Option A) thinking it uses customer-managed keys, but it actually uses Microsoft-managed keys. Option C is the only one that involves customer-managed keys, even though it addresses encryption at rest rather than in transit.
Detailed technical explanation
How to think about this question
Enabling 'Secure transfer required' sets the storage account property 'supportsHttpsTrafficOnly' to true, which rejects any HTTP requests and forces all clients to use HTTPS (TLS). For Azure Databricks, this means all data movement via the DBFS or Azure Blob Storage connector uses encrypted channels. In a real-world scenario, if this setting is disabled, a misconfigured Databricks cluster could accidentally use HTTP, exposing data in transit, which is a common compliance violation for regulated industries.
KKey Concepts to Remember
- Customer-managed keys (CMK)
- Encryption in transit
- Secure transfer required
- Minimum TLS version
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
Customer-managed keys (CMK)
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.
What to study next
Got this wrong? Here's your next step.
Review customer-managed keys (CMK), then practise related DP-203 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this DP-203 question test?
Design and implement data security — This question tests Design and implement data security — Customer-managed keys (CMK).
What is the correct answer to this question?
The correct answer is: Create a customer-managed key in Azure Key Vault and assign it to the storage account for encryption — Option C is correct because enabling Azure Storage encryption with a customer-managed key from Azure Key Vault is the only option that uses a customer-managed key. Although this encryption applies to data at rest, the question's requirement for customer-managed keys cannot be fully met for data in transit since Azure does not support customer-managed keys for TLS. However, among the options, only C involves customer-managed keys, making it the best answer.
What should I do if I get this DP-203 question wrong?
Review customer-managed keys (CMK), then practise related DP-203 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Customer-managed keys (CMK)
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Last reviewed: Jun 11, 2026
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