SC-900 Practice Question: Describe the capabilities of Microsoft security solutions
A company uses Microsoft 365 and stores many business documents in SharePoint Online and OneDrive. The security team wants to automatically detect and block malicious files (e.g., those containing ransomware or other malware) that are uploaded to these document libraries. Files should be scanned and held until proven safe. Which Microsoft security solution should they enable to provide this protection?
⚠ Common exam trap
Candidates often confuse Microsoft Defender for Office 365 with Microsoft Defender for Endpoint, assuming endpoint protection covers cloud storage scanning, but Safe Attachments is a specific feature of Defender for Office 365 that protects SharePoint and OneDrive at the file level.
Answer choices
Why each option matters
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 Office 365
Microsoft Defender for Office 365 includes Safe Attachments for SharePoint, OneDrive, and Microsoft Teams, which automatically scans files uploaded to these document libraries. If a file is detected as malicious (e.g., ransomware or malware), it is blocked and held in quarantine until it is proven safe, providing the exact protection described in the scenario.
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
Why it's wrong here
Microsoft Defender for Endpoint (MDE) is an enterprise endpoint security platform designed to help corporate networks prevent, detect, investigate, and respond to advanced threats. It provides robust protection for devices such as workstations, servers, and mobile devices through capabilities like next-generation protection, endpoint detection and response (EDR), and vulnerability management. While crucial for device security, MDE does not directly scan or protect files residing within Microsoft 365 cloud storage services like SharePoint Online or OneDrive for Business. Its scope is limited to the endpoints themselves, not the cloud repositories.
When this WOULD be correct
A company wants to protect its Windows and macOS devices from malware and detect advanced threats on endpoints. The question asks: 'Which solution should they deploy to provide antivirus, endpoint detection and response (EDR), and automated investigation on corporate laptops?'
- ✗
Microsoft Defender for Identity
Why it's wrong here
Microsoft Defender for Identity (MDI) is a cloud-based security solution that leverages on-premises Active Directory signals to identify, detect, and investigate advanced threats, compromised identities, and malicious insider actions. It primarily focuses on protecting user identities and detecting suspicious activities such as pass-the-hash, pass-the-ticket, and reconnaissance. MDI does not, however, provide capabilities for scanning or protecting files stored in cloud services like SharePoint Online or OneDrive for Business, making it unsuitable for securing business documents directly.
When this WOULD be correct
A question asking which Microsoft solution detects and alerts on suspicious user behavior, such as anomalous logins or privilege escalation attempts, using on-premises Active Directory and cloud identity signals would make Defender for Identity the correct answer.
- ✓
Microsoft Defender for Office 365
Why this is correct
Microsoft Defender for Office 365 (MDO) is specifically designed to protect against threats originating from email and collaboration tools within Microsoft 365. Its Safe Attachments feature extends protection to files stored in SharePoint Online, OneDrive for Business, and Microsoft Teams, proactively scanning documents for malware and blocking access to malicious content. This ensures that business documents stored in these cloud locations are secured against advanced threats like zero-day malware. Furthermore, MDO provides Safe Links and anti-phishing capabilities to safeguard users from malicious URLs and impersonation attempts.
- ✗
Microsoft Defender for Cloud
Why it's wrong here
Microsoft Defender for Cloud (MDC) is a comprehensive solution for cloud security posture management (CSPM) and cloud workload protection (CWP) across Azure, on-premises, and multi-cloud environments. It provides visibility into security posture, strengthens defenses, and protects workloads against threats by offering recommendations and advanced threat protection for VMs, databases, and containers. While it secures the underlying infrastructure and services, MDC does not directly provide granular file scanning or malware protection for content stored within Microsoft 365 collaboration services like SharePoint Online or OneDrive for Business.
When this WOULD be correct
A company runs Azure VMs and wants to detect and respond to threats on those virtual machines, including fileless malware and suspicious process behaviors. Enabling Microsoft Defender for Cloud would be the correct answer.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The SC-900 exam frequently reuses these exact scenarios with slightly different constraints.
✓Microsoft Defender for Office 365Correct answer▾
Why this is correct
Microsoft Defender for Office 365 (MDO) is specifically designed to protect against threats originating from email and collaboration tools within Microsoft 365. Its Safe Attachments feature extends protection to files stored in SharePoint Online, OneDrive for Business, and Microsoft Teams, proactively scanning documents for malware and blocking access to malicious content. This ensures that business documents stored in these cloud locations are secured against advanced threats like zero-day malware. Furthermore, MDO provides Safe Links and anti-phishing capabilities to safeguard users from malicious URLs and impersonation attempts.
✗Microsoft Defender for EndpointWrong answer — click to see why▾
Why this is wrong here
Microsoft Defender for Endpoint protects devices (endpoints) from malware, but does not scan files uploaded to SharePoint Online or OneDrive. The question specifically asks for a solution that scans files in document libraries, which is a workload protected by Defender for Office 365.
★ When this WOULD be the correct answer
A company wants to protect its Windows and macOS devices from malware and detect advanced threats on endpoints. The question asks: 'Which solution should they deploy to provide antivirus, endpoint detection and response (EDR), and automated investigation on corporate laptops?'
Why candidates choose this
Candidates may think that since Defender for Endpoint detects malware on devices, it would also scan files in cloud storage. They overlook that SharePoint and OneDrive are cloud services protected by Defender for Office 365, not endpoint-level solutions.
✗Microsoft Defender for IdentityWrong answer — click to see why▾
Why this is wrong here
Microsoft Defender for Identity focuses on detecting and investigating advanced threats, compromised identities, and malicious insider actions using Active Directory signals, not on scanning files in SharePoint or OneDrive for malware.
★ When this WOULD be the correct answer
A question asking which Microsoft solution detects and alerts on suspicious user behavior, such as anomalous logins or privilege escalation attempts, using on-premises Active Directory and cloud identity signals would make Defender for Identity the correct answer.
Why candidates choose this
Candidates may confuse 'Identity' with 'Office 365' because both involve Microsoft 365 security, or they might think identity protection includes file scanning, not realizing the specific focus on user accounts and authentication.
✗Microsoft Defender for CloudWrong answer — click to see why▾
Why this is wrong here
Microsoft Defender for Cloud is designed to protect cloud workloads (e.g., VMs, containers, PaaS services) across Azure and hybrid environments, not to scan and block malicious files in SharePoint Online or OneDrive document libraries.
★ When this WOULD be the correct answer
A company runs Azure VMs and wants to detect and respond to threats on those virtual machines, including fileless malware and suspicious process behaviors. Enabling Microsoft Defender for Cloud would be the correct answer.
Why candidates choose this
Candidates may confuse 'cloud' with Microsoft 365 cloud services, assuming Defender for Cloud covers all cloud-based threats including SharePoint and OneDrive, when it actually focuses on infrastructure security.
Analysis generated from the official SC-900blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Go deeper
Related to this question
Learn chapter
Core Security Concepts
Key term
Malware
Malware is any software intentionally designed to cause damage, disrupt operations, steal data, or gain unauthorized access to computer systems.
Key term
Security
Security in IT is the practice of protecting systems, networks, and data from unauthorized access, damage, or theft.
About these practice questions
This SC-900 question is part of Courseiva's 1,250-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This SC-900 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SC-900 exam.