- A
Disable the device in Microsoft Intune.
Why wrong: Disabling in Intune prevents management, but the device can still communicate on the network.
- B
Use Microsoft Defender for Endpoint to initiate device isolation.
Device isolation blocks all network traffic except communication with Defender for Endpoint cloud services.
- C
Perform a remote wipe of the device from Microsoft Intune.
Why wrong: Wiping is destructive and slower, and may not be necessary if isolation is sufficient.
- D
Block the user's account in Microsoft Entra ID.
Why wrong: Blocking the user does not isolate the device itself.
Question 1,574 of 1,639
Device Isolation with Microsoft Defender for Endpoint
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.
A security analyst needs to contain a compromised device that is spreading malware in the network. The device is enrolled in Microsoft Intune and managed by Microsoft Defender for Endpoint. What is the fastest way to isolate the device from the network?
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
✓
Use Microsoft Defender for Endpoint to initiate device isolation.
Option B is correct because Microsoft Defender for Endpoint provides a dedicated 'Device isolation' action that immediately blocks all network traffic to and from the device while maintaining connectivity to the Defender service for management and monitoring. This is the fastest containment method as it can be triggered directly from the Defender portal without requiring additional configuration or user interaction.
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.
- ✗
Disable the device in Microsoft Intune.
Why it's wrong here
Disabling in Intune prevents management, but the device can still communicate on the network.
- ✓
Use Microsoft Defender for Endpoint to initiate device isolation.
Why this is correct
Device isolation blocks all network traffic except communication with Defender for Endpoint cloud services.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Perform a remote wipe of the device from Microsoft Intune.
Why it's wrong here
Wiping is destructive and slower, and may not be necessary if isolation is sufficient.
- ✗
Block the user's account in Microsoft Entra ID.
Why it's wrong here
Blocking the user does not isolate the device itself.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse device isolation with account blocking or device wipe, not realizing that isolation is a network-level containment action that preserves the device's ability to communicate with the security management plane.
Detailed technical explanation
How to think about this question
Device isolation in Defender for Endpoint works by deploying a firewall rule on the device that drops all inbound and outbound traffic except for traffic to the Defender cloud service (via specific IP ranges and ports). This is achieved through the Microsoft Defender for Endpoint sensor, which communicates over HTTPS to maintain management capabilities even while the device is isolated. In a real-world scenario, this allows the security team to investigate and remediate the device without risking lateral movement of the malware.
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: Use Microsoft Defender for Endpoint to initiate device isolation. — Option B is correct because Microsoft Defender for Endpoint provides a dedicated 'Device isolation' action that immediately blocks all network traffic to and from the device while maintaining connectivity to the Defender service for management and monitoring. This is the fastest containment method as it can be triggered directly from the Defender portal without requiring additional configuration or user interaction.
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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