The answer is Microsoft Defender for Cloud Apps. This solution is correct because it functions as a Cloud Access Security Broker (CASB), using behavioral analytics to detect anomalous file downloads in third-party cloud apps like Box and Dropbox, especially when triggered by an unusual sign-in location. Once detected, it can automatically suspend the user’s account and initiate an investigation through its integration with Microsoft 365 Defender. On the SC-900 exam, this scenario tests your understanding of how Microsoft’s security solutions map to specific use cases—here, the key is recognizing that anomaly detection for third-party cloud apps is a core CASB capability of Defender for Cloud Apps, not a feature of Microsoft Entra ID or Defender for Endpoint. A common trap is confusing it with Microsoft Purview, which focuses on data governance rather than real-time behavioral detection. Memory tip: think “CASB catches cloud anomalies”—Defender for Cloud Apps is the cloud watchdog for suspicious downloads.
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 team monitors user activities in third-party cloud apps like Box and Dropbox. They want to automatically detect when a user performs an anomalous file download after signing in from an unusual location, and then suspend the user's account and initiate an investigation. Which Microsoft security solution should they use?
Why wrong: Defender for Office 365 focuses on protecting email and Office 365 collaboration tools, not third-party cloud apps like Box.
B
Microsoft Defender for Cloud Apps
Defender for Cloud Apps is designed to secure cloud apps (e.g., Box, Dropbox) with anomaly detection and automated actions such as user suspension.
C
Microsoft Defender for Identity
Why wrong: Defender for Identity monitors on-premises Active Directory for identity-based attacks; it does not directly integrate with third-party cloud apps.
D
Microsoft Defender for Endpoint
Why wrong: Defender for Endpoint protects endpoints (Windows, Linux, macOS) from malware and other threats; it does not provide cloud app session controls.
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 Cloud Apps
Microsoft Defender for Cloud Apps (MDCA) is the correct solution because it provides Cloud Access Security Broker (CASB) functionality, including anomaly detection for user activities across third-party cloud apps like Box and Dropbox. It can automatically detect anomalous file downloads after unusual sign-in locations using behavioral analytics and then trigger automated actions such as suspending the user account and initiating an investigation via integration with Microsoft 365 Defender.
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
Defender for Office 365 focuses on protecting email and Office 365 collaboration tools, not third-party cloud apps like Box.
✓
Microsoft Defender for Cloud Apps
Why this is correct
Defender for Cloud Apps is designed to secure cloud apps (e.g., Box, Dropbox) with anomaly detection and automated actions such as user suspension.
Related concept
Read the scenario before looking for a memorised answer.
✗
Microsoft Defender for Identity
Why it's wrong here
Defender for Identity monitors on-premises Active Directory for identity-based attacks; it does not directly integrate with third-party cloud apps.
✗
Microsoft Defender for Endpoint
Why it's wrong here
Defender for Endpoint protects endpoints (Windows, Linux, macOS) from malware and other threats; it does not provide cloud app session controls.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Microsoft Defender for Cloud Apps with Microsoft Defender for Identity, thinking both handle user behavior, but MDCA focuses on cloud app usage while MDI focuses on on-premises identity attacks.
Detailed technical explanation
How to think about this question
MDCA uses machine learning models to establish a baseline of user behavior, such as typical download volume and sign-in locations, and then flags deviations like a sudden large file download from an unfamiliar IP address. The automated response can leverage the Microsoft 365 Defender API to suspend the user in Azure AD and create an incident in Microsoft 365 Defender for investigation. In a real-world scenario, an attacker using stolen credentials might trigger this detection, and the suspension prevents further data exfiltration while the SOC reviews the alert.
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 Cloud Apps — Microsoft Defender for Cloud Apps (MDCA) is the correct solution because it provides Cloud Access Security Broker (CASB) functionality, including anomaly detection for user activities across third-party cloud apps like Box and Dropbox. It can automatically detect anomalous file downloads after unusual sign-in locations using behavioral analytics and then trigger automated actions such as suspending the user account and initiating an investigation via integration with Microsoft 365 Defender.
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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