The answer is Microsoft Defender for Endpoint, as it is the Microsoft 365 component designed to automatically isolate a compromised device when a ransomware alert is triggered. This capability stems from Defender for Endpoint’s automated investigation and remediation (AIR) features, which use built-in endpoint detection and response (EDR) playbooks to contain threats by cutting the device off from the network without manual intervention. On the SC-900 exam, this tests your understanding of how Microsoft 365 Defender’s incident response workflow leverages specific workloads for automated actions—a common trap is confusing Defender for Office 365 (which handles email threats) with Defender for Endpoint’s device-level isolation. Remember that device isolation is an endpoint action, so if the scenario involves quarantining a machine, think “Endpoint.” A helpful memory tip: “Isolate the device, Endpoint’s the choice.”
SC-900 Practice Question: Describe the capabilities of Microsoft security solutions
This SC-900 practice question tests your understanding of describe the capabilities of microsoft security solutions. 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.
A company is designing a Microsoft 365 Defender incident response workflow. They want to automatically isolate a compromised device when a ransomware alert is triggered. Which Microsoft 365 component should be used to execute the automated response action?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Microsoft Defender for Endpoint
Microsoft Defender for Endpoint includes automated investigation and remediation (AIR) capabilities that can isolate a device from the network when a ransomware alert is triggered. This is the correct component because it provides endpoint detection and response (EDR) with built-in playbooks for automatic containment actions like device isolation.
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.
✓
Microsoft Defender for Endpoint
Why this is correct
It includes AIR capabilities that can automatically isolate devices upon alert.
Related concept
Read the scenario before looking for a memorised answer.
✗
Microsoft Defender for Office 365
Why it's wrong here
It focuses on email and collaboration threats, not device-level actions.
✗
Microsoft Sentinel
Why it's wrong here
Sentinel can orchestrate responses but is not the native AIR engine for Defender alerts.
✗
Microsoft Purview
Why it's wrong here
Purview is for data governance and compliance, not endpoint response.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Microsoft Sentinel's SOAR capabilities (which can trigger isolation via playbooks) with the native automated response engine in Defender for Endpoint, but Sentinel is an orchestrator, not the component that directly executes the endpoint isolation action.
Detailed technical explanation
How to think about this question
Under the hood, Defender for Endpoint uses a sensor-based agent on Windows 10/11, Windows Server, macOS, or Linux that communicates with the cloud service via HTTPS (port 443). When a ransomware alert triggers an automatic investigation, the AIR engine can execute a 'contain device' action, which uses the Windows Filtering Platform (WFP) to block all network traffic except to the Defender for Endpoint cloud service, effectively isolating the device while still allowing management and telemetry. In a real-world scenario, this prevents lateral movement of ransomware while the SOC investigates.
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-900 question in full detail.
Describe the capabilities of Microsoft security solutions — This question tests Describe the capabilities of Microsoft security solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Microsoft Defender for Endpoint — Microsoft Defender for Endpoint includes automated investigation and remediation (AIR) capabilities that can isolate a device from the network when a ransomware alert is triggered. This is the correct component because it provides endpoint detection and response (EDR) with built-in playbooks for automatic containment actions like device isolation.
What should I do if I get this SC-900 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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