Quick Answer
The answer is an automation rule with incident closure action. This is correct because automation rules in Microsoft Sentinel allow you to define conditions—such as specific alert names, severity levels, or entity types—that, when matched, automatically trigger an incident closure action, effectively handling known false positives without any human intervention. On the Microsoft Cybersecurity Architect exam, this concept tests your understanding of how to operationalize security operations center efficiency by reducing alert fatigue; a common trap is confusing automation rules with playbooks, but remember that playbooks require a Logic App and are better for complex remediation, whereas a simple closure action is handled directly within the rule itself. For a quick memory tip, think “Close with a rule, not a playbook” to distinguish when a straightforward automation rule suffices for false positive suppression.
This SC-100 practice question tests your understanding of design solutions that align with security best practices and priorities. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 Sentinel for SIEM. You need to ensure that security incidents are automatically responded to without human intervention for known false positives. What should you implement?
An analytics rule with alert suppression
Why wrong: Suppresses alerts, but not automatic incident closure.
A playbook that runs on incident creation
Why wrong: Playbooks often require human approval or manual steps.
An entity behavior analytics rule
Why wrong: Identifies anomalies, doesn't auto-close.
An automation rule with incident closure action
Automation rules can auto-close incidents based on conditions.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
An automation rule with incident closure action
Option D is correct because automation rules in Microsoft Sentinel can be configured to automatically close incidents when specific conditions are met, such as when an incident is identified as a known false positive. This eliminates the need for human intervention by triggering an incident closure action based on predefined criteria, directly addressing the requirement for automated response to false positives.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
An analytics rule with alert suppression
Why it's wrong here
Suppresses alerts, but not automatic incident closure.
A playbook that runs on incident creation
Why it's wrong here
Playbooks often require human approval or manual steps.
An entity behavior analytics rule
Why it's wrong here
Identifies anomalies, doesn't auto-close.
An automation rule with incident closure action
Why this is correct
Automation rules can auto-close incidents based on conditions.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates often confuse alert suppression (which prevents duplicate alerts) with incident closure automation, or they assume a playbook is always required for automation, when in fact a simple automation rule with a closure action is the direct and correct solution for automatically handling known false positives.
Detailed technical explanation
Automation rules in Microsoft Sentinel operate at the incident level and can evaluate conditions such as incident title, severity, or custom tags. When a known false positive pattern is identified—for example, an incident with a specific title like 'Known False Positive: Test Alert'—the automation rule can trigger an incident closure action with a classification of 'FalsePositive' and a comment, ensuring the incident is automatically resolved without analyst review. This leverages the incident's properties and the rule's condition logic to achieve zero-touch response for predictable scenarios.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
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FAQ
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..
The correct answer is: An automation rule with incident closure action — Option D is correct because automation rules in Microsoft Sentinel can be configured to automatically close incidents when specific conditions are met, such as when an incident is identified as a known false positive. This eliminates the need for human intervention by triggering an incident closure action based on predefined criteria, directly addressing the requirement for automated response to false positives.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Same concept, more angles
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Your organization uses Microsoft Sentinel for security operations. You need to design a solution to automatically respond to a DDoS attack detected by Azure DDoS Protection. The response should include blocking the attacker's IP address in Azure Firewall and sending an alert to the security team. Which approach should you use?
hardWhy D: Option D is correct because Microsoft Sentinel automation rules can trigger a playbook (an Azure Logic App) when a DDoS attack detection alert fires. The playbook can execute an action to block the attacker's IP address in Azure Firewall via its REST API or PowerShell cmdlets, and simultaneously send an alert to the security team (e.g., via email or Teams). This provides an automated, orchestrated response directly from the SIEM, aligning with security operations best practices.
Variation 2. Your organization uses Microsoft Sentinel for security operations. The SOC team wants to automatically disable a compromised user account in Microsoft Entra ID when a high-severity alert is generated. Which automation method should you use?
hardWhy A: Automation rules in Microsoft Sentinel can trigger a playbook (an Azure Logic Apps workflow) when a high-severity alert fires. The playbook can then execute an action to disable the user account in Microsoft Entra ID via the Microsoft Graph API. This is the correct method because it provides the necessary integration between Sentinel alerts and Entra ID identity remediation.
Last reviewed: Jun 24, 2026
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