Quick Answer
The answer is system node pools because they are the only AKS node pool type that combines Microsoft-managed control plane, single-tenant isolation, and automatic patching for security updates. System node pools are designed to host critical system pods like CoreDNS and metrics-server, and Azure automatically applies security patches to the underlying worker nodes without manual intervention, ensuring compliance with the company’s requirements. On the AZ-305 exam, this concept tests your understanding of AKS node pool responsibilities and the shared responsibility model—specifically that system node pools handle control plane management and patching, while user node pools require you to manage updates yourself. A common trap is assuming user node pools also get automatic patching, but they do not; only system node pools receive this benefit. Remember the memory tip: “System = Security patched by Azure; User = You update.”
This AZ-305 practice question tests your understanding of design infrastructure solutions. 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.
A company is designing a containerized application on Azure Kubernetes Service (AKS). They need to ensure that the control plane is managed by Microsoft and that the worker nodes are isolated to a single tenant. They also require that the worker nodes be automatically patched for security updates. Which AKS node pool type should they use?
System node pools
System node pools are managed and automatically patched.
Spot node pools
Why wrong: Spot nodes are for cost savings, not automatic patching.
User node pools
Why wrong: User node pools require manual patching.
Virtual nodes (serverless)
Why wrong: Virtual nodes are serverless, not managed nodes.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
System node pools
Option C is correct because system node pools are managed by Azure and provide automatic patching. Option A is incorrect because serverless nodes are for on-demand pods, not managed nodes. Option B is incorrect because user node pools are for user workloads but require manual patching. Option D is incorrect because spot nodes are for non-critical workloads.
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
For each option: why learners choose it and why it is or isn't the right answer here.
System node pools
Why this is correct
System node pools are managed and automatically patched.
Related concept
Static NAT maps one inside address to one outside address.
Spot node pools
Why it's wrong here
Spot nodes are for cost savings, not automatic patching.
User node pools
Why it's wrong here
User node pools require manual patching.
Virtual nodes (serverless)
Why it's wrong here
Virtual nodes are serverless, not managed nodes.
Common exam traps
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
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.
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
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
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 AZ-305 NAT questions on configuration and troubleshooting.
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FAQ
Design infrastructure solutions — This question tests Design infrastructure solutions — Static NAT maps one inside address to one outside address..
The correct answer is: System node pools — Option C is correct because system node pools are managed by Azure and provide automatic patching. Option A is incorrect because serverless nodes are for on-demand pods, not managed nodes. Option B is incorrect because user node pools are for user workloads but require manual patching. Option D is incorrect because spot nodes are for non-critical workloads.
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 AZ-305 NAT questions on configuration and troubleshooting.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 20, 2026
This AZ-305 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the AZ-305 exam.
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