The answer is to create a Microsoft Sentinel automation rule that triggers a playbook to run an Azure Automation runbook to modify the NSG. This works because when Sentinel detects a threat, the automation rule fires the playbook, which executes a runbook that programmatically adds a deny-all rule to the Network Security Group (NSG) associated with the VM’s subnet or NIC, effectively isolating the VM from all network traffic. On the Microsoft Cybersecurity Architect exam, this scenario tests your understanding of how Sentinel’s Security Orchestration, Automation, and Response (SOAR) capabilities integrate with Azure Automation for incident response—a common trap is confusing this with Azure Policy (which enforces compliance, not real-time remediation) or Defender for Cloud’s built-in automation (which lacks the custom playbook flexibility Sentinel provides). Remember the chain: Sentinel triggers the playbook, the playbook calls the runbook, and the runbook locks down the NSG. Memory tip: “Sentinel sees, playbook flees, runbook freezes the NSG.”
SC-100 Practice Question: Design security solutions for applications and data
This SC-100 practice question tests your understanding of design security solutions for applications and data. 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.
Your organization uses Microsoft Sentinel to detect threats. You need to design a solution that automatically remediates a detected threat on an Azure VM by isolating the VM from the network. 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
✓
Create a Microsoft Sentinel automation rule that triggers a playbook to run an Azure Automation runbook to modify the NSG.
Option A is correct because Microsoft Sentinel can trigger a playbook (automation rule) that runs an Azure Automation runbook to modify the NSG and isolate the VM. Option B is wrong because Log Analytics workspace doesn't have remediation actions. Option C is wrong because Azure Policy is for compliance, not incident response. Option D is wrong because Defender for Cloud has some automation, but Sentinel playbook is the designed method for automated response.
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.
✓
Create a Microsoft Sentinel automation rule that triggers a playbook to run an Azure Automation runbook to modify the NSG.
Why this is correct
Sentinel playbooks can automate remediation via Azure Automation.
Related concept
Read the scenario before looking for a memorised answer.
✗
Configure a Log Analytics workspace query to run on a schedule and automatically block the VM.
Why it's wrong here
Log Analytics cannot execute remediation actions.
✗
Use Azure Policy to audit and automatically remediate non-compliant VMs.
Why it's wrong here
Azure Policy is for compliance, not real-time incident response.
✗
Enable Microsoft Defender for Cloud's 'Just-in-time VM access' policy.
Why it's wrong here
JIT reduces attack surface but doesn't automatically isolate a compromised VM.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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 applications and data — This question tests Design security solutions for applications and data — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create a Microsoft Sentinel automation rule that triggers a playbook to run an Azure Automation runbook to modify the NSG. — Option A is correct because Microsoft Sentinel can trigger a playbook (automation rule) that runs an Azure Automation runbook to modify the NSG and isolate the VM. Option B is wrong because Log Analytics workspace doesn't have remediation actions. Option C is wrong because Azure Policy is for compliance, not incident response. Option D is wrong because Defender for Cloud has some automation, but Sentinel playbook is the designed method for automated response.
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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