The answer is that the most likely cause is an incorrect field path for encryptionAtHost in the Azure Policy definition. This is because the policy rule must reference the exact property path, which is 'Microsoft.Compute/virtualMachines/securityProfile/encryptionAtHost', and any deviation—such as a missing or misordered segment—will cause the policy to either fail to evaluate or incorrectly deny compliant resources. On the Microsoft Cybersecurity Architect exam, this scenario tests your ability to read and validate Azure Policy definitions, particularly the distinction between the logical effect (deny) and the technical field path used in the rule. A common trap is assuming the policy logic is wrong when the field path is actually the culprit, so always double-check the property path against the Azure Resource Manager schema. Memory tip: think of the path as a nested folder structure—securityProfile is the parent folder, encryptionAtHost is the file inside it, and the full path must be spelled exactly as in the resource provider.
SC-100 Design security solutions for infrastructure Practice Question
This SC-100 practice question tests your understanding of design security solutions for infrastructure. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 an Azure Policy definition that denies deployment of virtual machines without encryption at host enabled. A developer reports they cannot deploy a VM that already has encryption at host enabled. 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.
The policy applies to all VMs regardless of encryption setting.
Why wrong: The policy only applies if encryptionAtHost equals false; it should not block compliant VMs.
B
The policy effect is 'audit' instead of 'deny', so it does not block deployment.
Why wrong: The policy uses 'deny' effect, so it should block non-compliant deployments.
C
The policy definition uses an incorrect field path for encryptionAtHost.
The field path 'Microsoft.Compute/virtualMachines/securityProfile.encryptionAtHost' uses a dot instead of a slash; the correct path uses slashes. An invalid path may cause the policy to evaluate incorrectly.
D
The policy is missing an exemption for the developer's subscription.
Why wrong: No exemption is needed if the VM is compliant.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The policy definition uses an incorrect field path for encryptionAtHost.
Option D is correct because the policy rule uses an incorrect field path for encryptionAtHost. The correct property path is 'Microsoft.Compute/virtualMachines/securityProfile/encryptionAtHost'. Option A is wrong because the effect is deny, not audit. Option B is wrong because the policy applies to all VMs, not just those without encryption. Option C is wrong because the deny effect is correctly targeting VMs with encryptionAtHost false, but the field path is wrong.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 policy applies to all VMs regardless of encryption setting.
Why it's wrong here
The policy only applies if encryptionAtHost equals false; it should not block compliant VMs.
✗
The policy effect is 'audit' instead of 'deny', so it does not block deployment.
Why it's wrong here
The policy uses 'deny' effect, so it should block non-compliant deployments.
✓
The policy definition uses an incorrect field path for encryptionAtHost.
Why this is correct
The field path 'Microsoft.Compute/virtualMachines/securityProfile.encryptionAtHost' uses a dot instead of a slash; the correct path uses slashes. An invalid path may cause the policy to evaluate incorrectly.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
The policy is missing an exemption for the developer's subscription.
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SC-100 NAT questions on configuration and troubleshooting.
Design security solutions for infrastructure — This question tests Design security solutions for infrastructure — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The policy definition uses an incorrect field path for encryptionAtHost. — Option D is correct because the policy rule uses an incorrect field path for encryptionAtHost. The correct property path is 'Microsoft.Compute/virtualMachines/securityProfile/encryptionAtHost'. Option A is wrong because the effect is deny, not audit. Option B is wrong because the policy applies to all VMs, not just those without encryption. Option C is wrong because the deny effect is correctly targeting VMs with encryptionAtHost false, but the field path is wrong.
What should I do if I get this SC-100 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SC-100 NAT questions on configuration and troubleshooting.
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?
Static NAT maps one inside address to one outside address.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This SC-100 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SC-100 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.