The answer is Microsoft Defender for Endpoint. This solution is correct because it delivers endpoint detection and response (EDR) capabilities that automatically detect and remediate advanced attacks, including ransomware and fileless attacks, while providing incident response teams with detailed forensic data and the ability to isolate an infected machine from the network. On the SC-900 exam, this question tests your understanding of how Microsoft 365 security solutions map to specific use cases—a common trap is confusing Microsoft Defender for Endpoint with Microsoft Defender for Office 365, which focuses on email and collaboration threats rather than endpoint-level attacks. Remember that MDE is the go-to for workstation and server protection against sophisticated threats like fileless malware, whereas other Defender products cover different attack surfaces. A helpful memory tip: think of "EDR" as "Endpoint Defender for Ransomware"—if the scenario mentions isolating machines or forensic data on endpoints, MDE is your answer.
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 uses Microsoft 365 and wants to deploy a security solution that can automatically detect and remediate advanced attacks on endpoints (workstations and servers), such as ransomware and fileless attacks. They also want to provide incident response teams with detailed forensic data and the ability to isolate an infected machine from the network. Which Microsoft security solution should they use?
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 automatic detection and remediation of advanced attacks like ransomware and fileless attacks. It also offers detailed forensic data for incident response and the ability to isolate an infected machine from the network, meeting all the specified requirements.
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 Office 365
Why it's wrong here
This solution protects against threats in email, Teams, and SharePoint, not on endpoints.
✓
Microsoft Defender for Endpoint
Why this is correct
Defender for Endpoint provides EDR, automatic investigation, and isolation to protect devices from advanced attacks.
Related concept
Read the scenario before looking for a memorised answer.
✗
Microsoft Defender for Identity
Why it's wrong here
This solution identifies and detects threats in on-premises Active Directory, not on endpoints.
✗
Microsoft Defender for Cloud Apps
Why it's wrong here
This solution discovers and controls usage of cloud applications, not endpoint threats.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse the endpoint-focused capabilities of Microsoft Defender for Endpoint with the email/identity/cloud-specific scopes of the other Defender products, failing to recognize that only MDE provides automated endpoint remediation and network isolation for workstations and servers.
Detailed technical explanation
How to think about this question
MDE uses a built-in sensor on Windows 10/11 and Windows Server to collect behavioral signals, which are analyzed by cloud-based machine learning models to detect fileless attacks that execute in memory without writing to disk. The automated investigation and remediation engine can roll back malicious changes, and the 'Isolate machine' action uses a network-level containment that blocks all inbound and outbound traffic except to the MDE cloud service, preserving forensic data for analysis.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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 automatic detection and remediation of advanced attacks like ransomware and fileless attacks. It also offers detailed forensic data for incident response and the ability to isolate an infected machine from the network, meeting all the specified requirements.
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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