The answer is Microsoft Defender for Cloud Apps session policy. This is the correct choice because session policies use a reverse proxy architecture to monitor and control user activities in real time, allowing you to block upload to personal cloud storage like Dropbox specifically for managed Windows devices while permitting access from compliant mobile devices. On the Microsoft 365 Administrator MS-102 exam, this tests your understanding of Conditional Access App Control, which enforces these policies based on device compliance—a common trap is confusing session policies with app permissions or access policies, which lack real-time activity control. Remember the memory tip: “Session blocks the action, not the app”—the policy targets the upload file activity, not the entire cloud storage service.
MS-102 Practice Question: Manage security and threats by using Microsoft Defender XDR
This MS-102 practice question tests your understanding of manage security and threats by using microsoft defender xdr. 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 security administrator wants to block users from uploading files to personal cloud storage apps (e.g., Dropbox) from managed Windows devices, while allowing access from compliant mobile devices. Which Microsoft 365 Defender feature should be used?
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 session policy
Microsoft Defender for Cloud Apps session policies use reverse proxy architecture to monitor and control user activities in real time. By configuring a session policy with the 'Block' action for the 'Upload file' activity on managed Windows devices, the administrator can prevent file uploads to personal cloud storage apps like Dropbox. Conditional Access App Control enforces this policy based on device compliance, allowing compliant mobile devices to bypass the block.
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 Endpoint Attack Surface Reduction rules
Why it's wrong here
ASR rules focus on device-level behavior, not granular control over cloud app file uploads.
✓
Microsoft Defender for Cloud Apps session policy
Why this is correct
Session policies allow granular control of user sessions in SaaS apps, including blocking file uploads based on device compliance.
Related concept
Read the scenario before looking for a memorised answer.
✗
Microsoft Defender for Office 365 Safe Attachments
Why it's wrong here
Safe Attachments scans email attachments for malware, not control of file uploads to cloud storage.
✗
Microsoft Defender for Identity
Why it's wrong here
Defender for Identity monitors on-premises AD for identity threats, not cloud app file upload activities.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse host-level ASR rules (Option A) with cloud-level session policies, failing to recognize that ASR rules cannot enforce conditional access based on device compliance or control uploads to specific cloud apps.
Detailed technical explanation
How to think about this question
Session policies in Defender for Cloud Apps leverage the reverse proxy of Conditional Access App Control to intercept HTTP/HTTPS traffic to sanctioned and unsanctioned cloud apps. The policy inspects the 'User-Agent' header and device claim from Azure AD to determine if the device is managed (e.g., hybrid Azure AD joined) and then applies actions like 'Block' or 'Protect' (e.g., apply DLP labels) on specific activities such as 'Upload file' or 'Download file'. In a real-world scenario, an organization might allow uploads only from iOS devices with a compliant Intune policy while blocking all Windows devices that are not domain-joined.
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 MS-102 question in full detail.
Manage security and threats by using Microsoft Defender XDR — This question tests Manage security and threats by using Microsoft Defender XDR — 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 session policy — Microsoft Defender for Cloud Apps session policies use reverse proxy architecture to monitor and control user activities in real time. By configuring a session policy with the 'Block' action for the 'Upload file' activity on managed Windows devices, the administrator can prevent file uploads to personal cloud storage apps like Dropbox. Conditional Access App Control enforces this policy based on device compliance, allowing compliant mobile devices to bypass the block.
What should I do if I get this MS-102 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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