The answer is to enable Microsoft Defender for Office 365 for real-time scanning of uploaded files and rely on version history and the recycle bin for self-service recovery. This combination works because Defender for Office 365 automatically detects and blocks ransomware-like behavior at the point of upload, preventing malicious files from spreading within SharePoint and OneDrive, while version history and the recycle bin empower users to restore encrypted files without administrative intervention, meeting the requirement for minimal overhead. On the Microsoft Cybersecurity Architect exam, this scenario tests your understanding of layered protection versus a single tool—a common trap is to overcomplicate the solution with Data Loss Prevention or Azure Information Protection, which do not provide real-time malware blocking or user-driven recovery. Remember the memory tip: “Defender blocks, versions restore” to quickly recall that upload scanning handles detection, while native SharePoint features handle recovery.
SC-100 Practice Question: Design solutions that align with security best practices and priorities
This SC-100 practice question tests your understanding of design solutions that align with security best practices and priorities. 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.
You are a security architect for a large enterprise that is migrating to Microsoft 365. The organization has 50,000 users across multiple regions. They have recently experienced a ransomware attack that encrypted files on SharePoint Online and OneDrive for Business. The security team wants to implement a comprehensive protection strategy. Requirements: 1. Automatically detect and block ransomware-like behavior in real-time. 2. Provide users with self-service recovery of files encrypted by ransomware. 3. Ensure that all files in SharePoint and OneDrive are scanned for malware upon upload. 4. Minimize administrative overhead. Which combination of Microsoft 365 security features should you recommend?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable Microsoft Defender for Office 365 to scan files on upload and use version history and recycle bin for recovery.
Option C is correct because Microsoft Defender for Office 365 provides real-time scanning of files uploaded to SharePoint and OneDrive, detecting and blocking known malware. Combined with version history and the recycle bin, users can self-recover files encrypted by ransomware without administrative intervention, satisfying all requirements with minimal overhead.
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.
✗
Use Microsoft Entra ID Protection to detect compromised accounts and automatically block access.
Why it's wrong here
Identity protection does not protect files from ransomware.
✗
Enable Microsoft Endpoint DLP and configure file policies to block encrypted files.
Why it's wrong here
DLP does not detect malware; it only blocks based on sensitive content.
✓
Enable Microsoft Defender for Office 365 to scan files on upload and use version history and recycle bin for recovery.
Why this is correct
Defender for Office 365 provides malware scanning and ransomware detection; version history allows self-recovery.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Configure Microsoft Purview auto-labeling to apply a 'Ransomware' label and then block all labeled files.
Why it's wrong here
Auto-labeling cannot detect ransomware behavior.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse Microsoft Defender for Office 365 with Microsoft Defender for Cloud Apps or Microsoft Purview, but only Defender for Office 365 provides both upload scanning and native version history/recycle bin recovery for SharePoint and OneDrive.
Detailed technical explanation
How to think about this question
Defender for Office 365 uses the same anti-malware engine as Exchange Online Protection (EOP) and scans files in SharePoint and OneDrive at upload time using the 'Common Attachment Filter' and 'MALWARE' detection heuristics. Version history in SharePoint retains previous file versions, allowing users to restore a clean copy even after encryption, while the recycle bin (both first-stage and second-stage) provides a 93-day recovery window for deleted or overwritten files. This combination ensures that ransomware-encrypted files can be rolled back without IT intervention, meeting the self-service recovery requirement.
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-100 question in full detail.
Design solutions that align with security best practices and priorities — This question tests Design solutions that align with security best practices and priorities — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable Microsoft Defender for Office 365 to scan files on upload and use version history and recycle bin for recovery. — Option C is correct because Microsoft Defender for Office 365 provides real-time scanning of files uploaded to SharePoint and OneDrive, detecting and blocking known malware. Combined with version history and the recycle bin, users can self-recover files encrypted by ransomware without administrative intervention, satisfying all requirements with minimal overhead.
What should I do if I get this SC-100 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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