The correct answer is to enable Microsoft Defender for Containers and apply Azure Policy with built-in AKS initiatives. Defender for Containers delivers runtime threat detection for your AKS clusters, scanning container registries and alerting on suspicious activity, while Azure Policy enforces compliance by automatically auditing or denying misconfigurations like privileged containers. On the Microsoft Cybersecurity Architect exam, this pairing tests your understanding that securing AKS requires both a detection layer (Defender) and a governance layer (Policy), not just perimeter controls. A common trap is assuming Network Security Groups apply to AKS—they do not, as AKS uses Kubernetes network policies for pod-level filtering. Another pitfall is thinking Azure Firewall is mandatory, but it is an optional egress control, not a core security requirement. Remember the mnemonic "DAP" for Defender, Azure Policy—the two pillars that cover threats and compliance without extra infrastructure.
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.
Which TWO actions should you take to secure an Azure Kubernetes Service (AKS) cluster using Microsoft Defender for Cloud?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Apply built-in Azure Policy initiatives for AKS
Options A and D are correct because enabling Defender for Containers provides threat detection, and Azure Policy with built-in AKS policies ensures compliance. Option B is wrong because AKS does not support NSGs; network policies are used. Option C is wrong because Azure Firewall is not required for AKS security. Option E is wrong because private clusters limit public access but are not a Defender feature.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Apply built-in Azure Policy initiatives for AKS
Why this is correct
Azure Policy ensures cluster compliance with security best practices.
Azure Firewall is optional, not a required security action for Defender.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
CIDR notation defines the prefix length.
Block size helps identify subnet boundaries.
Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
The required host count determines the smallest suitable subnet.
TExam Day Tips
→Write the block size before choosing the subnet.
→Check whether the question asks for hosts, subnets or a specific address range.
→Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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 block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related SC-100 subnetting questions on CIDR, address ranges, and subnet selection.
Design security solutions for infrastructure — This question tests Design security solutions for infrastructure — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Apply built-in Azure Policy initiatives for AKS — Options A and D are correct because enabling Defender for Containers provides threat detection, and Azure Policy with built-in AKS policies ensures compliance. Option B is wrong because AKS does not support NSGs; network policies are used. Option C is wrong because Azure Firewall is not required for AKS security. Option E is wrong because private clusters limit public access but are not a Defender feature.
What should I do if I get this SC-100 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related SC-100 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Question Discussion
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