- A
Remove the user account from the device.
Why wrong: Removing user accounts is not an automated action performed by AIR playbooks for device compromise; it is more relevant to identity-related threats.
- B
Execute a full antivirus scan on the device.
Why wrong: A full antivirus scan is a remediation step that may occur after containment, but it is not the containment action itself.
- C
Disable the network adapter.
Why wrong: Disabling the network adapter is not a standard automated action in AIR; device isolation achieves a similar effect without fully disabling the adapter.
- D
Initiate a device isolation.
Device isolation is a standard AIR action that quarantines the device from the network while allowing communication with Microsoft 365 Defender services for management.
SC-200 Mitigate threats using Microsoft Defender XDR Practice Question
This SC-200 practice question tests your understanding of mitigate threats using microsoft defender xdr. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. A key principle to apply: device isolation is a core containment action in Microsoft Defender for Endpoint.. 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 is investigating an incident in Microsoft 365 Defender where a device is detected as infected with a trojan. The analyst wants to use automated investigation to contain the threat. Which action can be automatically taken on the affected device as part of a standard AIR playbook for endpoint detection and response?
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
Initiate a device isolation.
In Microsoft Defender for Endpoint, the Automated Investigation and Response (AIR) playbook for endpoint detection and response includes the ability to isolate a device from the network. This action stops the device from communicating with other devices or the internet, containing the threat while allowing the investigation to continue. Option D is correct because device isolation is a standard containment action in the AIR playbook for trojan infections.
Key principle: Device isolation is a core containment action in Microsoft Defender for Endpoint.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Remove the user account from the device.
Why it's wrong here
Removing user accounts is not an automated action performed by AIR playbooks for device compromise; it is more relevant to identity-related threats.
- ✗
Execute a full antivirus scan on the device.
Why it's wrong here
A full antivirus scan is a remediation step that may occur after containment, but it is not the containment action itself.
- ✗
Disable the network adapter.
Why it's wrong here
Disabling the network adapter is not a standard automated action in AIR; device isolation achieves a similar effect without fully disabling the adapter.
- ✓
Initiate a device isolation.
Why this is correct
Device isolation is a standard AIR action that quarantines the device from the network while allowing communication with Microsoft 365 Defender services for management.
Related concept
Device isolation is a core containment action in Microsoft Defender for Endpoint.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'run a full antivirus scan' (a remediation action) with 'containment' (a first-step action), leading them to select Option B instead of recognizing that isolation is the primary automated containment action in the AIR playbook.
Trap categories for this question
Similar concept trap
Disabling the network adapter is not a standard automated action in AIR; device isolation achieves a similar effect without fully disabling the adapter.
Detailed technical explanation
How to think about this question
Device isolation in Microsoft Defender for Endpoint works by applying a network containment policy that blocks all inbound and outbound traffic except for communication with the Defender cloud service and a limited set of Microsoft services (e.g., Windows Update). This is enforced via the Windows Filtering Platform (WFP) and does not require manual intervention. In a real-world scenario, isolation is critical for preventing lateral movement of a trojan while allowing the security team to remotely investigate and remediate the device.
KKey Concepts to Remember
- Device isolation is a core containment action in Microsoft Defender for Endpoint.
- Isolated devices can still communicate with Microsoft 365 Defender services.
- AIR playbooks can automatically initiate device isolation based on threat severity.
- Isolation prevents lateral movement and further compromise from an infected device.
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
Device isolation is a core containment action in Microsoft Defender for Endpoint.
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.
Review device isolation is a core containment action in Microsoft Defender for Endpoint., then practise related SC-200 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this SC-200 question test?
Mitigate threats using Microsoft Defender XDR — This question tests Mitigate threats using Microsoft Defender XDR — Device isolation is a core containment action in Microsoft Defender for Endpoint..
What is the correct answer to this question?
The correct answer is: Initiate a device isolation. — In Microsoft Defender for Endpoint, the Automated Investigation and Response (AIR) playbook for endpoint detection and response includes the ability to isolate a device from the network. This action stops the device from communicating with other devices or the internet, containing the threat while allowing the investigation to continue. Option D is correct because device isolation is a standard containment action in the AIR playbook for trojan infections.
What should I do if I get this SC-200 question wrong?
Review device isolation is a core containment action in Microsoft Defender for Endpoint., then practise related SC-200 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Device isolation is a core containment action in Microsoft Defender for Endpoint.
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Last reviewed: Jun 11, 2026
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