The answer is Microsoft 365 Defender (now Microsoft Defender XDR), as it provides the unified investigation experience needed to trace a multi-stage attack from phishing email to lateral movement. This solution correlates signals across email, identity, and endpoint domains into a single incident view, allowing security teams to see the full attack story—from the initial phishing email in Defender for Office 365, to compromised user sign-ins via Defender for Identity, and lateral movement processes on endpoints through Defender for Endpoint—all within one console. On the SC-900 exam, this tests your understanding of how Microsoft’s integrated XDR solution delivers a single pane of glass for cross-domain threat investigation, often appearing as a scenario where you must identify the tool that unifies email, identity, and device data. A common trap is choosing separate tools like Defender for Endpoint alone, but remember: the key phrase is “unified investigation experience.” Memory tip: think “XDR = eXpanded Detection & Response” to recall it covers email, identity, and endpoints together.
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 security operations team investigates a multi-stage attack that began with a phishing email, then moved to credential compromise, and finally to lateral movement on endpoints. They need a single pane of glass to view the entire attack story, including the initial email, the compromised user's sign-in activities, and processes on affected devices. Which Microsoft security solution provides this unified investigation experience?
Why wrong: Sentinel is a cloud-native SIEM that can ingest logs from various sources, but it does not provide native, pre-built correlation across all M365 workloads like Microsoft 365 Defender does.
B
Microsoft Defender for Cloud
Why wrong: Defender for Cloud protects cloud workloads but does not unify email and identity threat data.
C
Microsoft 365 Defender
Microsoft 365 Defender unifies alerts and incidents from Microsoft Defender for Endpoint, Defender for Office 365, Defender for Identity, and Defender for Cloud Apps into a single view.
D
Microsoft Defender for Identity
Why wrong: Defender for Identity focuses on on-premises Active Directory threats; it does not provide the full cross-domain investigation.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Microsoft 365 Defender
Microsoft 365 Defender (now Microsoft Defender XDR) provides a unified investigation experience by correlating signals across email, identity, and endpoint domains into a single incident view. This allows the security team to see the full attack story—from the initial phishing email in Defender for Office 365, to the compromised user's sign-in activities via Defender for Identity, and the lateral movement processes on endpoints through Defender for Endpoint—all within one console.
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 Sentinel
Why it's wrong here
Sentinel is a cloud-native SIEM that can ingest logs from various sources, but it does not provide native, pre-built correlation across all M365 workloads like Microsoft 365 Defender does.
✗
Microsoft Defender for Cloud
Why it's wrong here
Defender for Cloud protects cloud workloads but does not unify email and identity threat data.
✓
Microsoft 365 Defender
Why this is correct
Microsoft 365 Defender unifies alerts and incidents from Microsoft Defender for Endpoint, Defender for Office 365, Defender for Identity, and Defender for Cloud Apps into a single view.
Related concept
Read the scenario before looking for a memorised answer.
✗
Microsoft Defender for Identity
Why it's wrong here
Defender for Identity focuses on on-premises Active Directory threats; it does not provide the full cross-domain investigation.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Microsoft Sentinel (a SIEM) with Microsoft 365 Defender (an XDR), assuming that any cross-domain investigation requires a SIEM, when in fact Microsoft 365 Defender provides the native, pre-correlated attack story across email, identity, and endpoints without needing custom log ingestion.
Detailed technical explanation
How to think about this question
Under the hood, Microsoft 365 Defender uses the Microsoft Graph Security API and the unified XDR correlation engine to automatically merge alerts from Defender for Office 365 (e.g., phishing mail events), Defender for Identity (e.g., anomalous sign-ins, pass-the-hash), and Defender for Endpoint (e.g., process creation, lateral movement commands) into a single incident. This correlation relies on entity matching (e.g., user principal name, device ID, IP addresses) and time-based heuristics to reconstruct the attack chain, enabling a true 'single pane of glass' without manual log stitching. In a real-world scenario, if an attacker uses a compromised mailbox to send internal phishing, the unified incident would show the email, the subsequent sign-in from a suspicious IP, and the execution of a malicious script on the target endpoint—all in one timeline.
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-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 365 Defender — Microsoft 365 Defender (now Microsoft Defender XDR) provides a unified investigation experience by correlating signals across email, identity, and endpoint domains into a single incident view. This allows the security team to see the full attack story—from the initial phishing email in Defender for Office 365, to the compromised user's sign-in activities via Defender for Identity, and the lateral movement processes on endpoints through Defender for Endpoint—all within one console.
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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