- A
Trigger a Microsoft Purview data loss prevention policy.
Why wrong: DLP policies prevent data loss but do not isolate devices.
- B
Run a Microsoft Entra ID playbook to disable the device.
Why wrong: Microsoft Entra ID cannot isolate devices from the network.
- C
Run a playbook that triggers a Microsoft Defender for Endpoint 'Isolate device' action.
This action isolates the device from the network, containing the exfiltration.
- D
Create an automation rule in Microsoft Intune to wipe the device.
Why wrong: Wiping is destructive and not immediate containment.
Question 77 of 1,639
Automate Device Isolation Using Sentinel Playbooks — Respond to Data Exfiltration
This SC-200 practice question tests your understanding of respond to security incidents. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 XDR. During an incident investigation, you find that a device is exfiltrating data to an external IP. You need to isolate the device from the network using automated response. Which action should you configure in an automation rule?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Run a playbook that triggers a Microsoft Defender for Endpoint 'Isolate device' action.
Option C is correct because the scenario requires network isolation of a device that is actively exfiltrating data. Microsoft Defender for Endpoint provides a built-in 'Isolate device' action that can be triggered via a playbook from a Microsoft Sentinel automation rule. This action immediately blocks all inbound and outbound network traffic to and from the device, except for communication with the Defender for Endpoint service, effectively containing the threat.
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.
- ✗
Trigger a Microsoft Purview data loss prevention policy.
Why it's wrong here
DLP policies prevent data loss but do not isolate devices.
- ✗
Run a Microsoft Entra ID playbook to disable the device.
Why it's wrong here
Microsoft Entra ID cannot isolate devices from the network.
- ✓
Run a playbook that triggers a Microsoft Defender for Endpoint 'Isolate device' action.
Why this is correct
This action isolates the device from the network, containing the exfiltration.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Create an automation rule in Microsoft Intune to wipe the device.
Why it's wrong here
Wiping is destructive and not immediate containment.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse 'disabling a device' in Entra ID (which only revokes authentication) with true network isolation, or they may think a DLP policy can stop active network-level exfiltration, when in fact only a Defender for Endpoint isolation action blocks all network traffic at the host level.
Detailed technical explanation
How to think about this question
The 'Isolate device' action in Microsoft Defender for Endpoint leverages the Windows Filtering Platform (WFP) to apply a firewall rule that blocks all traffic except for Defender for Endpoint cloud connectivity (using specific IP ranges and ports). This isolation can be either 'Full' (blocks all traffic) or 'Selective' (allows certain Microsoft services). In an automation rule, you would configure a playbook that calls the 'Isolate machine' API (e.g., POST /api/machines/{machineId}/isolate) to execute the action on the specific device ID identified during the incident.
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.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this SC-200 question test?
Respond to security incidents — This question tests Respond to security incidents — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Run a playbook that triggers a Microsoft Defender for Endpoint 'Isolate device' action. — Option C is correct because the scenario requires network isolation of a device that is actively exfiltrating data. Microsoft Defender for Endpoint provides a built-in 'Isolate device' action that can be triggered via a playbook from a Microsoft Sentinel automation rule. This action immediately blocks all inbound and outbound network traffic to and from the device, except for communication with the Defender for Endpoint service, effectively containing the threat.
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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Last reviewed: Jul 4, 2026
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