The correct choice is Azure Storage encryption with customer-managed keys (CMK) combined with a Key Vault access policy that denies key operations for the admin group. This solution directly addresses the requirement to prevent admin access to storage encryption keys by placing the keys under customer control in Azure Key Vault and then explicitly revoking the admin group’s permissions to perform key operations like get, list, or decrypt. On the AZ-500 exam, this scenario tests your understanding of the separation of duties between storage administrators and key management—a common trap is assuming infrastructure encryption or Microsoft-managed keys block admin access, but they do not. Remember, CMK gives you ownership of the keys, but you must also lock down the Key Vault permissions; otherwise, admins can still retrieve them. A useful memory tip is “CMK + Deny = Admin can’t pry”—the key is not just customer-managed, but also access-denied for the admin group.
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.
You are designing a secure data solution for a financial services company. Data must be encrypted at rest and in transit. Additionally, you need to prevent administrators from accessing the encryption keys. What should you use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure Storage encryption with customer-managed keys and a key vault access policy that denies key operations for the admin group.
Azure Storage encryption with customer-managed keys stored in a key vault with vault access policy set to deny all key operations for administrators meets the requirement. Option A is wrong because infrastructure encryption does not prevent admin access. Option B is wrong because Microsoft-managed keys do not meet the requirement. Option D is wrong because encryption in transit alone does not address at-rest encryption.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Azure Storage encryption with service-side encryption and HTTPS enforced.
Azure Storage encryption with customer-managed keys and a key vault access policy that denies key operations for the admin group.
Why this is correct
CMK with restricted access ensures admins cannot access keys.
Related concept
Standard ACLs match source addresses.
✗
Azure Storage encryption with Microsoft-managed keys.
Why it's wrong here
Microsoft-managed keys allow Microsoft to access keys, not the requirement.
✗
Azure Storage encryption with infrastructure encryption enabled.
Why it's wrong here
Infrastructure encryption encrypts data but does not prevent key access by admins.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related AZ-500 ACL questions on filtering logic and placement.
Secure compute, storage, and databases — This question tests Secure compute, storage, and databases — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Azure Storage encryption with customer-managed keys and a key vault access policy that denies key operations for the admin group. — Azure Storage encryption with customer-managed keys stored in a key vault with vault access policy set to deny all key operations for administrators meets the requirement. Option A is wrong because infrastructure encryption does not prevent admin access. Option B is wrong because Microsoft-managed keys do not meet the requirement. Option D is wrong because encryption in transit alone does not address at-rest encryption.
What should I do if I get this AZ-500 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related AZ-500 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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