The answer is to create a custom indicator for the file hash with the action 'Allow and alert'. This is correct because a custom indicator in Microsoft Defender for Endpoint overrides the automatic quarantine verdict by explicitly defining the file as trusted, while still generating an alert for visibility. On the MS-102 exam, this scenario tests your understanding of how to restore a quarantined file and prevent false positives in MDE using indicator-based policies rather than local exclusions, which are device-specific and can be bypassed by cloud protection. A common trap is confusing local antivirus exclusions with cloud-level indicators; remember that indicators apply globally across the Defender stack, whereas exclusions only affect real-time scanning on a single endpoint. Memory tip: think “Allow and alert” as the middle ground—it trusts the file but keeps an eye on it, unlike a full exclusion which blinds the system.
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.
Your organization uses Microsoft Defender for Endpoint. A security analyst reports that a critical file was quarantined on several devices, but the file is a trusted application. You need to restore the file and prevent future false positives. What should you do?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a custom indicator for the file hash with the action 'Allow and alert'.
Option C is correct because adding an indicator for the file hash allows and alerts on the file, preventing future quarantines. Option A is wrong because adding the file to the trusted list in Windows Defender Firewall does not affect Defender for Endpoint. Option B is wrong because allowing the file in Microsoft Defender Antivirus does not prevent it from being blocked by cloud protection. Option D is wrong because excluding the file from real-time protection is a temporary workaround that can be bypassed.
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.
✗
Add the file to the allowed list in Microsoft Defender Antivirus exclusions.
Why it's wrong here
Exclusions only bypass local AV, not cloud-based blocks.
✗
Disable real-time protection on affected devices.
Why it's wrong here
Disabling protection is a security risk and not a recommended solution.
✗
Add the file to the trusted list in Windows Defender Firewall.
Why it's wrong here
Windows Defender Firewall does not control file quarantines.
✓
Create a custom indicator for the file hash with the action 'Allow and alert'.
Why this is correct
Custom indicators in Defender for Endpoint allow you to override detection and prevent false positives.
Related concept
Read the scenario before looking for a memorised answer.
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: Create a custom indicator for the file hash with the action 'Allow and alert'. — Option C is correct because adding an indicator for the file hash allows and alerts on the file, preventing future quarantines. Option A is wrong because adding the file to the trusted list in Windows Defender Firewall does not affect Defender for Endpoint. Option B is wrong because allowing the file in Microsoft Defender Antivirus does not prevent it from being blocked by cloud protection. Option D is wrong because excluding the file from real-time protection is a temporary workaround that can be bypassed.
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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