The correct choice is server-side encryption with customer-managed keys (CMK) stored in Azure Key Vault. This option meets the requirement for encrypting Azure Blob Storage with customer-managed keys and on-demand rotation because it places the encryption key lifecycle entirely in your hands while Azure handles the underlying encryption process, minimizing administrative overhead. On the AZ-500 exam, this scenario tests your understanding of the shared responsibility model for data at rest—specifically, that CMK gives you control over key rotation and revocation without managing the encryption engine itself. A common trap is confusing client-side encryption (which adds overhead and requires you to manage encryption logic) or Azure-managed keys (which do not allow on-demand rotation). Memory tip: think “CMK = Customer Manages Keys, Azure does the rest”—if you need to rotate on demand, you need your own key in Key Vault.
AZ-500 Secure compute, storage, and databases Practice Question
This AZ-500 practice question tests your understanding of secure compute, storage, and databases. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 confidential data in Azure Blob Storage. They need to ensure that all data at rest is encrypted and they must be able to quickly rotate the encryption key on demand in case of a security breach. They also want to minimize administrative overhead. Which encryption option should they use?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Server-side encryption with customer-managed keys (CMK) stored in Azure Key Vault
Server-side encryption with customer-managed keys (CMK) stored in Azure Key Vault allows the organization to control and rotate the encryption key on demand, meeting the security breach response requirement. This option encrypts data at rest in Azure Blob Storage while minimizing administrative overhead because Azure manages the encryption process, and the customer only manages the key lifecycle in Key Vault.
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.
✗
Server-side encryption with Microsoft-managed keys
Why it's wrong here
Microsoft manages the keys and rotates them automatically. Customers cannot perform on-demand rotation.
✓
Server-side encryption with customer-managed keys (CMK) stored in Azure Key Vault
Why this is correct
CMK allows you to bring your own key and rotate it as needed. Azure Key Vault integration simplifies key management.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Client-side encryption
Why it's wrong here
Client-side encryption requires application changes to encrypt/decrypt data, increasing overhead and complexity.
✗
Azure Disk Encryption
Why it's wrong here
Azure Disk Encryption is for encrypting OS and data disks of VMs, not applicable to Azure Blob Storage.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse Azure Disk Encryption (which encrypts VM disks) with Azure Storage encryption, or assume that Microsoft-managed keys support on-demand rotation, when in fact only customer-managed keys allow the customer to control the key lifecycle.
Detailed technical explanation
How to think about this question
With CMK, Azure Blob Storage uses envelope encryption: a data encryption key (DEK) encrypts the blob, and the DEK is encrypted by a key encryption key (KEK) stored in Azure Key Vault. Rotating the KEK in Key Vault automatically re-encrypts the DEK without rewriting the blob data, enabling rapid key rotation with no performance impact. In a real-world breach scenario, you can disable or delete the KEK in Key Vault to immediately render the blobs inaccessible, providing a cryptographic 'kill switch'.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-500 question in full detail.
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: Server-side encryption with customer-managed keys (CMK) stored in Azure Key Vault — Server-side encryption with customer-managed keys (CMK) stored in Azure Key Vault allows the organization to control and rotate the encryption key on demand, meeting the security breach response requirement. This option encrypts data at rest in Azure Blob Storage while minimizing administrative overhead because Azure manages the encryption process, and the customer only manages the key lifecycle in Key Vault.
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: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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