The correct answer is an anomaly detection policy because this policy type in Microsoft Defender for Cloud Apps is specifically designed to identify unusual behavioral patterns, such as a user downloading more than 100 files from SharePoint in 10 minutes, by comparing activity against a learned baseline or predefined thresholds. Unlike file policies that inspect metadata or content, anomaly detection focuses on deviations from normal user behavior, making it ideal for spotting potential data exfiltration or compromised accounts. On the SC-900 exam, this concept tests your understanding of how Microsoft’s cloud security solutions classify threats—a common trap is confusing anomaly detection with session policies (which control real-time access) or app permission policies (which govern third-party app grants). To remember, think of “anomaly” as “abnormal activity” tied to user behavior patterns, not static file rules.
SC-900 Practice Question: Describe the concepts of security, compliance, and identity
This SC-900 practice question tests your understanding of describe the concepts of security, compliance, and identity. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 deploys Microsoft Defender for Cloud Apps. They want to detect when a user downloads more than 100 files from SharePoint in 10 minutes. Which policy type should they create?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Anomaly detection policy
Option C is correct because an anomaly detection policy in Defender for Cloud Apps can identify unusual file download activities based on predefined thresholds. Option A is wrong because an app permission policy governs permissions granted to third-party apps. Option B is wrong because a session policy enforces real-time controls on user sessions. Option D is wrong because a file policy monitors files based on metadata or content, not behavioral patterns.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
File policy
Why it's wrong here
File policies monitor file attributes and content, not user download patterns.
✓
Anomaly detection policy
Why this is correct
Anomaly detection policies use machine learning to detect unusual user behavior like mass downloads.
Related concept
Static NAT maps one inside address to one outside address.
✗
App permission policy
Why it's wrong here
App permission policies manage permissions for third-party apps, not user behavior.
✗
Session policy
Why it's wrong here
Session policies control user sessions in real time, but are not designed for bulk download detection.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SC-900 NAT questions on configuration and troubleshooting.
Describe the concepts of security, compliance, and identity — This question tests Describe the concepts of security, compliance, and identity — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Anomaly detection policy — Option C is correct because an anomaly detection policy in Defender for Cloud Apps can identify unusual file download activities based on predefined thresholds. Option A is wrong because an app permission policy governs permissions granted to third-party apps. Option B is wrong because a session policy enforces real-time controls on user sessions. Option D is wrong because a file policy monitors files based on metadata or content, not behavioral patterns.
What should I do if I get this SC-900 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SC-900 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
About these practice questions
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These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Your company uses Microsoft Defender for Cloud Apps. You notice that a user is downloading large volumes of data from a sanctioned cloud app that exceeds the normal pattern. Which action should you take to automatically block this activity?
hard
✓ A.Create a session policy to monitor and control downloads
B.Configure a cloud discovery policy
C.Create a Microsoft Purview DLP policy
D.Block the app in Defender for Cloud Apps
Why A: Option B is correct because you can create a session policy that monitors user behavior and blocks downloads exceeding a threshold. Option A is wrong because cloud discovery identifies shadow IT, not blocking. Option C is wrong because DLP policies in Purview are for data classification, not block based on volume. Option D is wrong because blocking the app entirely is too restrictive.
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Question Discussion
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