The answer is Microsoft Defender for Cloud Apps (MDCA). This solution is correct because it functions as a Cloud Access Security Broker (CASB) with built-in anomaly detection policies that use machine learning to establish a baseline of normal user behavior; when a user downloads a large number of files from a cloud storage app after hours, MDCA identifies this deviation as a potential data exfiltration attempt and triggers an alert. On the SC-900 exam, this scenario tests your understanding of how CASB capabilities map to specific security threats—a common trap is confusing MDCA with Microsoft Purview (which focuses on data classification and DLP) or with Microsoft Sentinel (a SIEM). Remember that MDCA is the go-to for spotting behavioral anomalies in third-party SaaS apps like Salesforce and Box, not just Microsoft 365. Memory tip: think "Cloud App Anomaly = MDCA" to link after-hours downloads with the CASB solution.
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 many third-party SaaS apps like Salesforce and Box. The security team wants to detect when a user downloads a large number of files from a cloud storage app after hours, which may indicate data exfiltration. Which Microsoft security solution should be used to detect such anomalous behavior in cloud apps?
Why wrong: Defender for Office 365 protects against threats in email and collaboration tools like SharePoint and Teams, but not generally third-party cloud apps.
B
Microsoft Defender for Identity
Why wrong: Defender for Identity detects threats in on-premises Active Directory, not in cloud apps.
C
Microsoft Defender for Cloud Apps
Defender for Cloud Apps provides cloud access security broker capabilities, including anomaly detection for third-party SaaS apps.
D
Microsoft Defender for Cloud
Why wrong: Defender for Cloud provides security posture management and threat detection for cloud infrastructure, not for SaaS apps.
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 policies that can identify unusual user behavior such as downloading a large number of files from a cloud storage app after hours. MDCA uses machine learning to establish a baseline of normal user activity and then triggers alerts when deviations like high-volume downloads occur, which is a classic indicator of data exfiltration.
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 protects against threats in email and collaboration tools like SharePoint and Teams, but not generally third-party cloud apps.
✗
Microsoft Defender for Identity
Why it's wrong here
Defender for Identity detects threats in on-premises Active Directory, not in cloud apps.
✓
Microsoft Defender for Cloud Apps
Why this is correct
Defender for Cloud Apps provides cloud access security broker capabilities, including anomaly detection for third-party SaaS apps.
Related concept
Read the scenario before looking for a memorised answer.
✗
Microsoft Defender for Cloud
Why it's wrong here
Defender for Cloud provides security posture management and threat detection for cloud infrastructure, not for SaaS apps.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse Microsoft Defender for Cloud Apps with Microsoft Defender for Cloud, mistakenly thinking the latter covers SaaS app security, when in fact Defender for Cloud is focused on infrastructure workload protection (CSPM/CWPP) and not user behavior in cloud apps.
Detailed technical explanation
How to think about this question
MDCA's anomaly detection leverages the Cloud App Security API to ingest activity logs from connected apps (e.g., via OAuth or API connectors) and applies behavioral analytics with a 21-day learning period to establish per-user baselines. A real-world scenario might involve a compromised user account downloading 500 files from Box at 2 AM, which MDCA would flag as an 'impossible travel' or 'unusual file download' activity, triggering an automated governance action like suspending the user or requiring re-authentication.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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 policies that can identify unusual user behavior such as downloading a large number of files from a cloud storage app after hours. MDCA uses machine learning to establish a baseline of normal user activity and then triggers alerts when deviations like high-volume downloads occur, which is a classic indicator of data exfiltration.
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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