- A
Initiate a Full isolation from the device's action menu.
Full isolation blocks all network traffic except to the Defender service.
- B
Contain the device from the Microsoft Defender XDR portal.
Why wrong: Containment is not an isolation method; it restricts lateral movement but does not block network traffic.
- C
Apply a firewall rule to block all outbound traffic.
Why wrong: Blocking all traffic would prevent the device from communicating with Defender services.
- D
Run a selective isolation to block only external connections.
Why wrong: Selective isolation is not a feature in Defender for Endpoint.
Question 1,009 of 1,639
Full Device Isolation in Microsoft Defender for Endpoint with Defender Service Access
This SC-200 practice question tests your understanding of respond to security incidents. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. A key principle to apply: full isolation. 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 company uses Microsoft Defender XDR. During a ransomware incident, you need to isolate a compromised Windows 10 device from the network while allowing connectivity to the Microsoft Defender for Endpoint service. Which action should you take?
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 Full isolation from the device's action menu.
The correct action is to Initiate a Full isolation from the device's action menu. Full isolation blocks all network traffic except to the Microsoft Defender for Endpoint service, allowing the device to still communicate with Defender for reporting and updates. Option B (Contain the device) is not an isolation action; it prevents the device from communicating with other devices but allows some network traffic. Option C (Apply a firewall rule) would block all outbound traffic, preventing the device from reaching Defender services. Option D (Selective isolation) is not a valid isolation type in Microsoft Defender for Endpoint; only Full isolation is available.
Key principle: Full isolation
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Initiate a Full isolation from the device's action menu.
Why this is correct
Full isolation blocks all network traffic except to the Defender service.
Related concept
Full isolation
- ✗
Contain the device from the Microsoft Defender XDR portal.
Why it's wrong here
Containment is not an isolation method; it restricts lateral movement but does not block network traffic.
- ✗
Apply a firewall rule to block all outbound traffic.
Why it's wrong here
Blocking all traffic would prevent the device from communicating with Defender services.
- ✗
Run a selective isolation to block only external connections.
Why it's wrong here
Selective isolation is not a feature in Defender for Endpoint.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Candidates might confuse Full isolation with Selective isolation, but Selective isolation is not a real isolation type in Microsoft Defender for Endpoint. Only Full isolation exists, which blocks all traffic except to Defender services.
Detailed technical explanation
How to think about this question
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Full isolation
- Contain
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
Full isolation
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 full isolation, 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?
Respond to security incidents — This question tests Respond to security incidents — Full isolation.
What is the correct answer to this question?
The correct answer is: Initiate a Full isolation from the device's action menu. — The correct action is to Initiate a Full isolation from the device's action menu. Full isolation blocks all network traffic except to the Microsoft Defender for Endpoint service, allowing the device to still communicate with Defender for reporting and updates. Option B (Contain the device) is not an isolation action; it prevents the device from communicating with other devices but allows some network traffic. Option C (Apply a firewall rule) would block all outbound traffic, preventing the device from reaching Defender services. Option D (Selective isolation) is not a valid isolation type in Microsoft Defender for Endpoint; only Full isolation is available.
What should I do if I get this SC-200 question wrong?
Review full isolation, then practise related SC-200 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Full isolation
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Last reviewed: Jun 21, 2026
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