The answer is that infrastructure encryption enables double encryption of data at rest. This means your data is encrypted twice: once at the service level using the key you specify (in this case, from Microsoft.Keyvault) and again at the infrastructure or storage node level using a separate Microsoft-managed key. This provides defense in depth, ensuring that even if one encryption layer is compromised, the second layer remains intact. On the Microsoft Azure Solutions Architect Expert AZ-305 exam, this concept tests your understanding of Azure Storage security controls and the difference between single encryption (default) and double encryption. A common trap is confusing infrastructure encryption with client-side encryption or TLS, but remember that infrastructure encryption is purely about encrypting the physical disk writes twice. Memory tip: think of it as a "belt and suspenders" approach—two independent locks on the same data.
AZ-305 Design infrastructure solutions Practice Question
This AZ-305 practice question tests your understanding of design infrastructure solutions. 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.
Refer to the exhibit. You are reviewing the properties of an Azure Storage account. The encryption section shows keySource as Microsoft.Keyvault and infrastructureEncryption enabled. What does infrastructureEncryption mean in this context?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It enables double encryption of data at rest
Infrastructure encryption provides an additional layer of encryption at the infrastructure level, encrypting data twice. Option A is incorrect because it does not refer to the key vault itself. Option C is incorrect because TLS is separate. Option D is incorrect because it is not about automatically rotating keys.
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.
✗
It enforces HTTPS for all data in transit
Why it's wrong here
HTTPS enforcement is controlled by supportsHttpsTrafficOnly property.
✗
It automatically rotates the encryption key daily
Why it's wrong here
Key rotation is managed separately; infrastructure encryption does not imply automatic rotation.
✗
It encrypts the encryption key stored in Key Vault
Why it's wrong here
The key in Key Vault is already encrypted at rest; infrastructure encryption is a separate layer.
✓
It enables double encryption of data at rest
Why this is correct
Infrastructure encryption applies a second layer of encryption using platform-managed keys.
Related concept
Read the scenario before looking for a memorised answer.
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 AZ-305 question in full detail.
Identify which AZ-305 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.
Design infrastructure solutions — This question tests Design infrastructure solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: It enables double encryption of data at rest — Infrastructure encryption provides an additional layer of encryption at the infrastructure level, encrypting data twice. Option A is incorrect because it does not refer to the key vault itself. Option C is incorrect because TLS is separate. Option D is incorrect because it is not about automatically rotating keys.
What should I do if I get this AZ-305 question wrong?
Identify which AZ-305 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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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