The answer is Microsoft Defender for Endpoint. This solution is correct because it combines endpoint detection and response (EDR) capabilities with behavioral-based detection, using machine learning to identify suspicious activity like a process rapidly encrypting files—a hallmark of ransomware. Once detected, Defender for Endpoint enables device isolation, which severs the infected machine’s network connections while preserving a secure channel for investigation, preventing lateral movement across the organization. On the SC-900 exam, this scenario tests your understanding of how Microsoft 365 Defender’s components map to specific security needs; a common trap is confusing Defender for Endpoint with Microsoft Defender for Cloud Apps or Microsoft Defender for Office 365, which handle different threat vectors. Remember the memory tip: “Endpoint for encryption, isolation for protection”—if the question mentions file encryption and cutting off network access, think Defender for Endpoint.
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.
An organization wants to protect its fleet of Windows 10 laptops from advanced malware and ransomware. The solution must detect suspicious behavior (e.g., a process encrypting files) and provide security teams with the ability to isolate an infected device from the network for investigation. Which Microsoft security solution should they deploy?
Why wrong: Defender for Cloud secures cloud workloads (VMs, containers, etc.) across Azure and hybrid environments, not specifically endpoint devices.
B
Microsoft Defender for Endpoint
Defender for Endpoint provides next-generation protection, endpoint detection and response (EDR), and device isolation capabilities for device security.
C
Microsoft Defender for Cloud Apps
Why wrong: Defender for Cloud Apps is a cloud access security broker (CASB) for controlling access to SaaS applications, not endpoint protection.
D
Microsoft Defender for Office 365
Why wrong: Defender for Office 365 protects email, SharePoint, OneDrive, and Teams from threats like phishing and malware in collaboration content.
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 (MDE) is the correct solution because it provides endpoint detection and response (EDR) capabilities, including behavioral-based detection of advanced malware and ransomware (e.g., detecting a process encrypting files via machine learning and behavioral analytics). It also includes automated investigation and remediation features, such as the ability to isolate an infected device from the network (device isolation) to prevent lateral movement while allowing security teams to investigate.
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 Cloud
Why it's wrong here
Defender for Cloud secures cloud workloads (VMs, containers, etc.) across Azure and hybrid environments, not specifically endpoint devices.
✓
Microsoft Defender for Endpoint
Why this is correct
Defender for Endpoint provides next-generation protection, endpoint detection and response (EDR), and device isolation capabilities for device security.
Related concept
Read the scenario before looking for a memorised answer.
✗
Microsoft Defender for Cloud Apps
Why it's wrong here
Defender for Cloud Apps is a cloud access security broker (CASB) for controlling access to SaaS applications, not endpoint protection.
✗
Microsoft Defender for Office 365
Why it's wrong here
Defender for Office 365 protects email, SharePoint, OneDrive, and Teams from threats like phishing and malware in collaboration content.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Microsoft Defender for Cloud (a cloud workload protection tool) with endpoint protection, or they assume Defender for Office 365 covers all devices, when in fact only Defender for Endpoint provides the specific behavioral detection and device isolation for Windows 10 laptops.
Detailed technical explanation
How to think about this question
Under the hood, MDE uses a combination of cloud-delivered machine learning models and sensor-based behavioral monitoring on the endpoint (via the Microsoft Defender Antivirus engine and the EDR sensor) to detect file-encryption patterns typical of ransomware. Device isolation in MDE works by blocking all inbound and outbound network traffic at the OS level (except traffic to the MDE cloud service), effectively quarantining the device while preserving the investigation trail via the Microsoft 365 Defender portal.
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 (MDE) is the correct solution because it provides endpoint detection and response (EDR) capabilities, including behavioral-based detection of advanced malware and ransomware (e.g., detecting a process encrypting files via machine learning and behavioral analytics). It also includes automated investigation and remediation features, such as the ability to isolate an infected device from the network (device isolation) to prevent lateral movement while allowing security teams to investigate.
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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