The answer is to isolate affected devices from the network using Microsoft Defender for Endpoint, along with reviewing the incident timeline and using advanced hunting. These three actions are correct because a structured investigation requires you to first analyze the chronological sequence of events in the timeline to understand the attack chain, then leverage advanced hunting with KQL queries to uncover hidden threats and gather evidence, and finally contain the threat by isolating compromised devices to prevent lateral movement. On the MS-102 exam, this question tests your ability to prioritize containment and evidence preservation over remediation—a common trap is choosing to delete emails or reset passwords immediately, which can destroy forensic data. Remember the memory tip: "Time, Hunt, Isolate" to lock in the correct sequence before any cleanup actions.
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. 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 investigating an incident in Microsoft Defender XDR. The incident involves multiple alerts from different sources. Which THREE actions should you take during the investigation?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Review the incident timeline to understand the sequence of events.
Options A, C, and D are correct because during investigation, you should analyze alerts, gather evidence, and isolate affected devices. Option B is wrong because immediately deleting all related emails may destroy evidence. Option E is wrong because resetting passwords should be done after analysis.
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.
✓
Review the incident timeline to understand the sequence of events.
Why this is correct
The incident timeline provides a chronological view of alerts and activities.
Related concept
Read the scenario before looking for a memorised answer.
✗
Delete all emails related to the incident from all mailboxes.
Why it's wrong here
Deleting emails prematurely can destroy evidence needed for investigation.
✓
Use advanced hunting to query for related activities across devices and identities.
Why this is correct
Advanced hunting allows in-depth investigation of events across the environment.
Related concept
Read the scenario before looking for a memorised answer.
✓
Isolate affected devices from the network using Microsoft Defender for Endpoint.
Why this is correct
Isolating devices prevents lateral movement and further damage.
Related concept
Read the scenario before looking for a memorised answer.
✗
Reset the passwords of all user accounts involved.
Why it's wrong here
Password reset should be part of remediation after the investigation is complete.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this MS-102 question in full detail.
Identify which MS-102 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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: Review the incident timeline to understand the sequence of events. — Options A, C, and D are correct because during investigation, you should analyze alerts, gather evidence, and isolate affected devices. Option B is wrong because immediately deleting all related emails may destroy evidence. Option E is wrong because resetting passwords should be done after analysis.
What should I do if I get this MS-102 question wrong?
Identify which MS-102 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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