The answer is an Azure Key Vault with the EnabledForDiskEncryption property set to true and the BitLocker feature being available on the Windows VM. These two requirements are essential because Azure Disk Encryption leverages BitLocker to perform volume-level encryption on the OS and data disks, and the Key Vault must be explicitly configured to allow disk encryption operations by setting the EnabledForDiskEncryption flag, which grants Azure the necessary permissions to access the encryption keys. On the Microsoft Cybersecurity Architect exam, this question tests your understanding of the prerequisites for implementing encryption at rest on Azure VMs, often appearing as a multi-select item where common traps include assuming a public IP or Azure Backup is required. Remember that the VM must be a supported size, but not just any size, and that the Key Vault flag is a non-negotiable configuration step. A useful memory tip is to think of the two pillars: Key Vault access and BitLocker presence—without both, the encryption engine cannot run.
SC-100 Design security solutions for infrastructure Practice Question
This SC-100 practice question tests your understanding of design security solutions for infrastructure. 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.
Which TWO of the following are requirements for implementing Azure Disk Encryption on Windows VMs? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The BitLocker Drive Encryption feature must be available (Windows)
Option B (Key Vault with EnabledForDiskEncryption) and Option E (BitLocker feature available) are requirements. Option A is not required because the VM does not need a public IP. Option C is incorrect because Azure Backup is not required. Option D is incorrect because the VM must be a supported size, but any size is not correct.
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 BitLocker Drive Encryption feature must be available (Windows)
Why this is correct
BitLocker is required; it's available in supported Windows versions.
Related concept
Read the scenario before looking for a memorised answer.
✗
The VM must be a supported VM size
Why it's wrong here
Not any size; some sizes are not supported, but a specific size is not a requirement.
✗
The VM must have a public IP address
Why it's wrong here
Public IP is not required.
✓
An Azure Key Vault with the EnabledForDiskEncryption property set to true
Why this is correct
This is required for key management.
Related concept
Read the scenario before looking for a memorised answer.
✗
An Azure Backup vault in the same region
Why it's wrong here
Backup is not a requirement.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this SC-100 question in full detail.
Identify which SC-100 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 security solutions for infrastructure — This question tests Design security solutions for infrastructure — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The BitLocker Drive Encryption feature must be available (Windows) — Option B (Key Vault with EnabledForDiskEncryption) and Option E (BitLocker feature available) are requirements. Option A is not required because the VM does not need a public IP. Option C is incorrect because Azure Backup is not required. Option D is incorrect because the VM must be a supported size, but any size is not correct.
What should I do if I get this SC-100 question wrong?
Identify which SC-100 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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