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 deploying Azure Kubernetes Service (AKS) and needs to secure container workloads. You must ensure that only approved container images from a trusted Azure Container Registry (ACR) can be deployed. What should you implement?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Apply an Azure Policy initiative to only allow images from a specific ACR.
Option C is correct because Azure Policy with the 'Only allow approved container images' built-in initiative enforces that containers in AKS must originate from a specified ACR. Option A is incorrect because network policies control traffic, not image source. Option B is incorrect because Azure AD integration controls authentication, not image source. Option D is incorrect because Azure Key Vault stores secrets, not image approval.
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.
✗
Enable Azure AD integration for AKS.
Why it's wrong here
Azure AD integration manages user access, not image approval.
✓
Apply an Azure Policy initiative to only allow images from a specific ACR.
Why this is correct
Azure Policy can enforce image source restrictions.
Related concept
Static NAT maps one inside address to one outside address.
✗
Use Azure Key Vault to store container image credentials.
Why it's wrong here
Key Vault stores secrets; it does not enforce image source.
✗
Configure network policies in AKS to restrict egress traffic.
Why it's wrong here
Network policies do not restrict image sources.
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: Apply an Azure Policy initiative to only allow images from a specific ACR. — Option C is correct because Azure Policy with the 'Only allow approved container images' built-in initiative enforces that containers in AKS must originate from a specified ACR. Option A is incorrect because network policies control traffic, not image source. Option B is incorrect because Azure AD integration controls authentication, not image source. Option D is incorrect because Azure Key Vault stores secrets, not image approval.
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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Question Discussion
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