SC-200 Respond to security incidents Practice Question
This SC-200 practice question tests your understanding of respond to security incidents. 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 and Microsoft Defender for Cloud. During an incident, you need to automatically disable a compromised Azure VM from the network. Which playbook action 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
✓
Add a rule to the VM's network security group to deny all traffic.
Option A is correct because you can use Azure Network Security Group to deny all inbound/outbound traffic to the VM. Option B is wrong because Azure RBAC does not affect network access. Option C is wrong because Azure Policy does not apply runtime network controls. Option D is wrong because Azure Firewall rules are not VM-specific.
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.
✗
Apply an Azure Policy to deny network changes.
Why it's wrong here
Azure Policy is for compliance, not immediate isolation.
✗
Create an Azure Firewall rule to block the VM's IP.
Why it's wrong here
Azure Firewall rules affect all traffic through the firewall, not just the VM.
✓
Add a rule to the VM's network security group to deny all traffic.
Why this is correct
NSG rules can isolate the VM from network traffic.
Related concept
Standard ACLs match source addresses.
✗
Remove the VM's role assignment from Azure RBAC.
Why it's wrong here
RBAC does not affect network connectivity.
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 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-200 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 SC-200 ACL questions on filtering logic and placement.
Respond to security incidents — This question tests Respond to security incidents — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Add a rule to the VM's network security group to deny all traffic. — Option A is correct because you can use Azure Network Security Group to deny all inbound/outbound traffic to the VM. Option B is wrong because Azure RBAC does not affect network access. Option C is wrong because Azure Policy does not apply runtime network controls. Option D is wrong because Azure Firewall rules are not VM-specific.
What should I do if I get this SC-200 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 SC-200 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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