The answer is Azure Logic Apps with managed identity. This is the correct choice because Logic Apps serves as the native platform for creating Sentinel playbooks, enabling automated incident response workflows triggered by analytics rules, while managed identity provides a secure, credential-free authentication method that eliminates the need to store or rotate secrets. On the Microsoft Cybersecurity Architect exam, this question tests your understanding of cloud-native SOC automation versus legacy approaches—a common trap is confusing Azure Automation runbooks with Logic Apps playbooks, but remember that runbooks are for infrastructure automation and playbooks are for security orchestration. The exam emphasizes managed identity over service principals because it simplifies automation at scale and aligns with zero-trust principles. Memory tip: think “Playbooks need Logic, not Runbooks”—and managed identity means you never manage credentials.
SC-100 Design security solutions for infrastructure Practice Question
This SC-100 practice question tests your understanding of design security solutions for infrastructure. 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 company is migrating to a cloud-native security operations center (SOC) using Microsoft Sentinel. You need to design a solution that automatically investigates and remediates common incidents like brute-force attacks on Azure VMs. The solution should use playbooks triggered by analytics rules. Which Microsoft service should you use to create the playbooks, and what is the recommended authentication method?
Why wrong: Power Automate is for business workflows, not recommended for Sentinel automation; user accounts are not suitable for automated authentication.
B
Azure Automation with service principal
Why wrong: Azure Automation is for runbooks, but Sentinel playbooks are built on Logic Apps.
C
Azure Logic Apps with managed identity
Logic Apps supports managed identity for secure, credential-free authentication to Azure resources.
D
Azure Functions with API key
Why wrong: Functions can be used but are not the primary service for playbooks; API keys are less secure.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure Logic Apps with managed identity
Azure Logic Apps is the recommended platform for Sentinel playbooks. Managed identity is the preferred authentication method because it avoids credential management and supports automation. Azure Automation is for runbooks, not playbooks. Service principal is possible but not recommended due to credential management.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Power Automate with user account
Why it's wrong here
Power Automate is for business workflows, not recommended for Sentinel automation; user accounts are not suitable for automated authentication.
✗
Azure Automation with service principal
Why it's wrong here
Azure Automation is for runbooks, but Sentinel playbooks are built on Logic Apps.
✓
Azure Logic Apps with managed identity
Why this is correct
Logic Apps supports managed identity for secure, credential-free authentication to Azure resources.
Related concept
Static NAT maps one inside address to one outside address.
✗
Azure Functions with API key
Why it's wrong here
Functions can be used but are not the primary service for playbooks; API keys are less secure.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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-100 question in full detail.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SC-100 NAT questions on configuration and troubleshooting.
Design security solutions for infrastructure — This question tests Design security solutions for infrastructure — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Azure Logic Apps with managed identity — Azure Logic Apps is the recommended platform for Sentinel playbooks. Managed identity is the preferred authentication method because it avoids credential management and supports automation. Azure Automation is for runbooks, not playbooks. Service principal is possible but not recommended due to credential management.
What should I do if I get this SC-100 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SC-100 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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