- A
The Key Vault is in a different Azure region than the storage account.
Why wrong: The Key Vault can be in any region as long as the storage account can access it. Cross-region Key Vaults are supported, so this is not the issue.
- B
The storage account does not have a system-assigned managed identity enabled.
Why wrong: For customer-managed keys, the storage account uses a managed identity to access the Key Vault. If the managed identity is missing or not configured, encryption operations would fail, but they would not fall back to Microsoft-managed keys silently. The blobs would not upload successfully or would fail encryption.
- C
A default encryption scope is configured on the blob container that uses a Microsoft-managed key.
Encryption scopes can be set at the container level. A default encryption scope overrides the storage account-level encryption. If the scope uses Microsoft-managed keys, new blobs in that container will not use the customer-managed key.
- D
The customer-managed key in Key Vault is disabled or expired.
Why wrong: If the key is disabled or expired, encryption operations would fail (blobs would not be written), not silently fall back to Microsoft-managed keys.
Quick Answer
The correct answer is that a default encryption scope configured on the blob container using a Microsoft-managed key overrides the storage account’s customer-managed key setting. This happens because encryption scopes applied at the container level take precedence over the account-level encryption policy, so even when infrastructure encryption and a customer-managed key are enabled on the storage account, any blob uploaded to that container will inherit the container’s encryption scope instead. On the AZ-500 exam, this concept tests your understanding of how encryption precedence works in Azure Blob Storage, often appearing as a trap where candidates assume account-level settings always apply. A common memory tip is to remember that “containers can override accounts” — think of the container as having the final say on encryption for blobs within it. To avoid this pitfall, always check whether a default encryption scope is set on the container before troubleshooting customer-managed key issues.
AZ-500 Secure compute, storage, and databases Practice Question
This AZ-500 practice question tests your understanding of secure compute, storage, and databases. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 company stores sensitive documents in an Azure Blob Storage account. They have enabled infrastructure encryption and configured the storage account to use a customer-managed key stored in Azure Key Vault for encryption at rest. Despite this, newly uploaded blobs are still encrypted with Microsoft-managed keys. What is the most likely cause?
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.
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
A default encryption scope is configured on the blob container that uses a Microsoft-managed key.
Option C is correct because when a default encryption scope is set on a blob container, it overrides the storage account's encryption settings for all blobs uploaded to that container. Even if the storage account is configured with a customer-managed key (CMK), the container-level encryption scope with a Microsoft-managed key takes precedence, causing new blobs to be encrypted with Microsoft-managed keys instead.
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 Key Vault is in a different Azure region than the storage account.
Why it's wrong here
The Key Vault can be in any region as long as the storage account can access it. Cross-region Key Vaults are supported, so this is not the issue.
- ✗
The storage account does not have a system-assigned managed identity enabled.
Why it's wrong here
For customer-managed keys, the storage account uses a managed identity to access the Key Vault. If the managed identity is missing or not configured, encryption operations would fail, but they would not fall back to Microsoft-managed keys silently. The blobs would not upload successfully or would fail encryption.
- ✓
A default encryption scope is configured on the blob container that uses a Microsoft-managed key.
Why this is correct
Encryption scopes can be set at the container level. A default encryption scope overrides the storage account-level encryption. If the scope uses Microsoft-managed keys, new blobs in that container will not use the customer-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 customer-managed key in Key Vault is disabled or expired.
Why it's wrong here
If the key is disabled or expired, encryption operations would fail (blobs would not be written), not silently fall back to Microsoft-managed keys.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume the storage account-level CMK setting applies uniformly to all blobs, but they overlook that encryption scopes at the container level can override that setting, causing a silent fallback to Microsoft-managed keys.
Detailed technical explanation
How to think about this question
Encryption scopes in Azure Blob Storage allow administrators to apply a distinct encryption policy at the container or blob level, overriding the storage account's default encryption. When a container has a default encryption scope set to a Microsoft-managed key, any blob uploaded without an explicit encryption scope inherits that container-level scope, bypassing the account-level CMK. This is a common configuration for multi-tenant scenarios where different containers require different encryption keys, but it can cause confusion if not carefully managed.
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.
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
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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Secure compute, storage, and databases — study guide chapter
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Secure compute, storage, and databases practice questions
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FAQ
Questions learners often ask
What does this AZ-500 question test?
Secure compute, storage, and databases — This question tests Secure compute, storage, and databases — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: A default encryption scope is configured on the blob container that uses a Microsoft-managed key. — Option C is correct because when a default encryption scope is set on a blob container, it overrides the storage account's encryption settings for all blobs uploaded to that container. Even if the storage account is configured with a customer-managed key (CMK), the container-level encryption scope with a Microsoft-managed key takes precedence, causing new blobs to be encrypted with Microsoft-managed keys instead.
What should I do if I get this AZ-500 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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.
About these practice questions
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Last reviewed: Jun 11, 2026
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