SC-100 Practice Question: Design solutions that align with security best practices and priorities
This SC-100 practice question tests your understanding of design solutions that align with security best practices and priorities. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 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?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create an automation rule in Microsoft Sentinel that triggers a playbook to block the IP in Azure Firewall
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.
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.
✗
Configure an alert rule in Azure Monitor to send an email to the security team
Why it's wrong here
Email notification alone does not block the attacker's IP.
✗
Use Azure Policy to deny network traffic from the attacker's IP range
Why it's wrong here
Azure Policy is for compliance, not real-time IP blocking.
✗
Configure a resource lock on the Azure Firewall to prevent changes
Why it's wrong here
Resource locks prevent accidental deletion or modification, not dynamic blocking.
✓
Create an automation rule in Microsoft Sentinel that triggers a playbook to block the IP in Azure Firewall
Why this is correct
Sentinel automation rules with playbooks can orchestrate automated response actions.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse Azure Monitor alert rules (which only notify) with Sentinel automation rules (which can trigger remediation playbooks), or think Azure Policy can dynamically block IPs when it is actually a static compliance enforcement tool.
Detailed technical explanation
How to think about this question
Under the hood, the playbook uses an HTTP trigger from Sentinel's alert, then calls the Azure FirewallREST API (e.g., POST to /subscriptions/{subId}/resourceGroups/{rg}/providers/Microsoft.Network/azureFirewalls/{firewallName}/updateTags) or uses the New-AzFirewallPolicyRuleCollectionGroup cmdlet to add a network rule that denies traffic from the attacker's IP. The playbook can also use the Azure Monitor Alerts action to send an email via Office 365 Outlook connector. In a real-world scenario, the playbook should include error handling and logging to avoid race conditions if multiple alerts fire simultaneously.
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 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 SC-100 question in full detail.
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..
What is the correct answer to this question?
The correct answer is: Create an automation rule in Microsoft Sentinel that triggers a playbook to block the IP in Azure Firewall — 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.
What should I do if I get this SC-100 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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Question Discussion
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