The answer is that the missing keyVersion in the customer-managed key encryption ARM template causes Azure Storage to default to a Microsoft-managed key. When you define a customer-managed key in an ARM template, the keyVersion property must specify an exact version of the key; leaving it empty or omitting it tells Azure to use the latest version, but if the key does not already exist in the vault or the vault is inaccessible, the service falls back to platform-managed encryption. This scenario tests your understanding of how Azure handles encryption key resolution in Infrastructure as Code deployments, a common trap on the DP-203 exam where candidates assume an empty keyVersion will dynamically resolve to the latest key. The exam often hides this nuance in ARM template snippets, so remember: a missing keyVersion is not a dynamic reference—it’s a silent fallback to Microsoft-managed keys. Memory tip: “No version, no customer—Azure takes the wheel.”
DP-203 Practice Question: Secure, monitor, and optimize data storage and data processing
This DP-203 practice question tests your understanding of secure, monitor, and optimize data storage and data processing. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Refer to the exhibit. You are creating an Azure Storage account using an ARM template with the above snippet. After deployment, a security auditor reviews the configuration and notes that the storage account is not using a customer-managed key for encryption. What is the most likely reason?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
The 'keyVersion' is missing a specific version, so Azure Storage defaults to Microsoft-managed key.
For customer-managed key, a specific key version is required; an empty version may cause Azure to use the latest but if the key is not accessible, it falls back to Microsoft-managed key.
B
The 'keySource' should be 'Microsoft.Storage' for customer-managed key.
Why wrong: 'Microsoft.Keyvault' is correct for customer-managed key.
C
The storage account requires double encryption to use customer-managed key.
Why wrong: Double encryption is an additional feature but not a prerequisite for customer-managed key.
D
The 'infrastructureEncryption' setting is enabled, which overrides customer-managed key.
Why wrong: Infrastructure encryption works with customer-managed keys; it does not override.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The 'keyVersion' is missing a specific version, so Azure Storage defaults to Microsoft-managed key.
Option B is correct because the keyVersion is empty, which means Azure Storage will use the latest version of the key, but the key must be present in the vault. However, the snippet does not specify the 'keyVaultProperties' correctly; the property 'keyName' is valid, but the 'keyVersion' being empty might cause Azure to default to a Microsoft-managed key if the key does not exist or if the vault is not accessible. Option A is wrong because infrastructure encryption is independent of key source. Option C is wrong because 'infrastructureEncryption' is a separate setting. Option D is wrong because double encryption is not the issue.
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.
✓
The 'keyVersion' is missing a specific version, so Azure Storage defaults to Microsoft-managed key.
Why this is correct
For customer-managed key, a specific key version is required; an empty version may cause Azure to use the latest but if the key is not accessible, it falls back to Microsoft-managed key.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The 'keySource' should be 'Microsoft.Storage' for customer-managed key.
Why it's wrong here
'Microsoft.Keyvault' is correct for customer-managed key.
✗
The storage account requires double encryption to use customer-managed key.
Why it's wrong here
Double encryption is an additional feature but not a prerequisite for customer-managed key.
✗
The 'infrastructureEncryption' setting is enabled, which overrides customer-managed key.
Why it's wrong here
Infrastructure encryption works with customer-managed keys; it does not override.
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-203 question in full detail.
Identify which DP-203 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.
Secure, monitor, and optimize data storage and data processing — This question tests Secure, monitor, and optimize data storage and data processing — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The 'keyVersion' is missing a specific version, so Azure Storage defaults to Microsoft-managed key. — Option B is correct because the keyVersion is empty, which means Azure Storage will use the latest version of the key, but the key must be present in the vault. However, the snippet does not specify the 'keyVaultProperties' correctly; the property 'keyName' is valid, but the 'keyVersion' being empty might cause Azure to default to a Microsoft-managed key if the key does not exist or if the vault is not accessible. Option A is wrong because infrastructure encryption is independent of key source. Option C is wrong because 'infrastructureEncryption' is a separate setting. Option D is wrong because double encryption is not the issue.
What should I do if I get this DP-203 question wrong?
Identify which DP-203 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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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