SC-200 Manage a security operations environment Practice Question
This SC-200 practice question tests your understanding of manage a security operations environment. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
You are a security analyst at a company that uses Microsoft Defender XDR. You receive an alert about a potential ransomware activity on a workstation. The alert is generated by Microsoft Defender for Endpoint. You need to contain the threat by isolating the workstation from the network while allowing forensic analysis to proceed. You want to use Microsoft Defender XDR's built-in actions. What should you do?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use the 'Isolate device' action from the Microsoft Defender XDR portal.
The 'Isolate device' action in Microsoft Defender XDR (specifically from the Microsoft Defender for Endpoint component) disconnects the device from all network traffic except for the Defender for Endpoint service and a few authorized services (such as Windows Update and the Microsoft Update Service). This allows forensic analysis tools (like Live Response) to continue communicating with the device while preventing the ransomware from spreading laterally or communicating with command-and-control servers. This is the built-in, recommended containment action for such scenarios.
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 firewall rule in Microsoft Defender for Cloud Apps to block the device's IP.
Why it's wrong here
Not a direct containment action for endpoints.
✓
Use the 'Isolate device' action from the Microsoft Defender XDR portal.
Why this is correct
Isolation blocks most network traffic but allows forensic connections.
Related concept
Read the scenario before looking for a memorised answer.
✗
Unenroll the device from Microsoft Intune.
Why it's wrong here
Unenrolling removes management and does not contain the threat.
✗
Disable the network adapter on the workstation remotely.
Why it's wrong here
Not a built-in action; requires separate tools.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse network isolation with other security controls (like blocking an IP in a CASB or unenrolling from MDM) and fail to recognize that Microsoft Defender XDR's 'Isolate device' is the only built-in action that both contains the threat and preserves forensic access.
Detailed technical explanation
How to think about this question
When you initiate 'Isolate device' from the Microsoft Defender XDR portal, the Defender for Endpoint sensor on the endpoint enforces a Windows Filtering Platform (WFP) firewall rule that blocks all outbound and inbound traffic except for a specific allowlist (Defender service, Windows Update, Microsoft Update, and the Windows Defender Security Center). This isolation mode is full isolation (not 'selective' isolation) and can be reversed only from the portal. Importantly, the device remains connected to the Microsoft Defender for Endpoint cloud service, enabling continued alerting and Live Response sessions for forensic data collection.
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.
TExam Day Tips
→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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this SC-200 question in full detail.
Manage a security operations environment — This question tests Manage a security operations environment — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use the 'Isolate device' action from the Microsoft Defender XDR portal. — The 'Isolate device' action in Microsoft Defender XDR (specifically from the Microsoft Defender for Endpoint component) disconnects the device from all network traffic except for the Defender for Endpoint service and a few authorized services (such as Windows Update and the Microsoft Update Service). This allows forensic analysis tools (like Live Response) to continue communicating with the device while preventing the ransomware from spreading laterally or communicating with command-and-control servers. This is the built-in, recommended containment action for such scenarios.
What should I do if I get this SC-200 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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