- A
Revoke the user's session in Microsoft Entra ID
Why wrong: Revoking session does not isolate the device.
- B
Use Microsoft Defender for Endpoint to initiate device isolation
Defender for Endpoint allows immediate isolation of the device.
- C
Open Microsoft Sentinel and run a playbook
Why wrong: Sentinel can automate but immediate isolation is better via endpoint action.
- D
Use Microsoft Intune to wipe the device
Why wrong: Wiping is more severe and not immediate isolation.
Question 56 of 1,411
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 security analyst in your organization receives an alert from Microsoft Defender XDR indicating that a user's device may be infected with ransomware. The analyst needs to immediately isolate the device from the network to prevent further spread. What should the analyst do?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"immediately / without restart"Why it matters: Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
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
Microsoft Defender for Endpoint includes a built-in device isolation capability that can be triggered directly from the Microsoft Defender XDR portal. This action immediately disconnects the device from all network communications (except the Defender service) to contain a confirmed ransomware infection, preventing lateral movement while allowing forensic analysis.
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.
- ✗
Revoke the user's session in Microsoft Entra ID
Why it's wrong here
Revoking session does not isolate the device.
- ✓
Use Microsoft Defender for Endpoint to initiate device isolation
Why this is correct
Defender for Endpoint allows immediate isolation of the device.
Clue confirmation
The clue word "immediately / without restart" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Open Microsoft Sentinel and run a playbook
Why it's wrong here
Sentinel can automate but immediate isolation is better via endpoint action.
- ✗
Use Microsoft Intune to wipe the device
Why it's wrong here
Wiping is more severe and not immediate isolation.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse identity-based controls (session revocation) with endpoint-based network containment, or they overcomplicate the response by thinking a SOAR playbook is required when Defender for Endpoint provides a one-click isolation action directly in the alert workflow.
Detailed technical explanation
How to think about this question
Device isolation in Defender for Endpoint works by applying a network firewall policy that blocks all outbound and inbound traffic except for communication with the Microsoft Defender cloud service (via specific IP ranges and ports). This allows the device to still send telemetry and receive isolation commands while preventing SMB, RDP, and other lateral movement protocols. The isolation can be applied as 'full isolation' (blocks all network traffic) or 'selective isolation' (allows certain Microsoft services), and the analyst can release isolation once the threat is remediated.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this SC-900 question test?
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: Use Microsoft Defender for Endpoint to initiate device isolation — Microsoft Defender for Endpoint includes a built-in device isolation capability that can be triggered directly from the Microsoft Defender XDR portal. This action immediately disconnects the device from all network communications (except the Defender service) to contain a confirmed ransomware infection, preventing lateral movement while allowing forensic analysis.
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.
Are there clue words in this question I should notice?
Yes — watch for: "immediately / without restart". Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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Last reviewed: Jul 4, 2026
This SC-900 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SC-900 exam.
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