- A
Use a configuration management tool like Ansible to enforce desired state on each node via periodic runs.
Why wrong: Ansible runs are imperative and can drift or fail; they also allow manual changes between runs.
- B
Apply Kubernetes node labels and taints to categorize nodes and prevent workloads from running on non-standard nodes.
Why wrong: Labels and taints do not prevent configuration drift; they only control pod scheduling.
- C
Create a golden AMI using Packer with all required configurations, then use Auto Scaling groups with a launch template that references the AMI and enable instance refresh for updates.
A golden AMI provides an identical, immutable base. Instance refresh replaces nodes rather than modifying them.
- D
Deploy a DaemonSet that runs a privileged container to enforce node configuration and remove debugging tools.
Why wrong: A DaemonSet cannot modify kernel parameters or system packages reliably, and it does not prevent SSH access.
KCNA Cloud Native Architecture Practice Question
This KCNA practice question tests your understanding of cloud native architecture. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
You are a platform engineer at a fast-growing startup. The company runs a Kubernetes cluster with 50 worker nodes for its production microservices. Recently, the operations team has been struggling with manual configuration drift: developers SSH into nodes to install debugging tools, and some nodes have different kernel parameters or installed packages. This has caused intermittent outages when a pod is scheduled onto a non-standard node. The CTO wants a solution that ensures each node is identical, immutable, and reproducible. The cluster uses kubeadm for bootstrapping and runs on AWS EC2. Which approach best achieves the goal of immutable nodes?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Create a golden AMI using Packer with all required configurations, then use Auto Scaling groups with a launch template that references the AMI and enable instance refresh for updates.
Option C is correct because it uses a golden AMI built with Packer to create identical, immutable nodes that are reproducible via Auto Scaling groups and launch templates. This approach ensures that every EC2 instance launched has the exact same kernel parameters, packages, and configuration, eliminating configuration drift. Instance refresh allows rolling updates to the AMI without manual intervention, aligning with the goal of immutable infrastructure.
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.
- ✗
Use a configuration management tool like Ansible to enforce desired state on each node via periodic runs.
Why it's wrong here
Ansible runs are imperative and can drift or fail; they also allow manual changes between runs.
- ✗
Apply Kubernetes node labels and taints to categorize nodes and prevent workloads from running on non-standard nodes.
Why it's wrong here
Labels and taints do not prevent configuration drift; they only control pod scheduling.
- ✓
Create a golden AMI using Packer with all required configurations, then use Auto Scaling groups with a launch template that references the AMI and enable instance refresh for updates.
Why this is correct
A golden AMI provides an identical, immutable base. Instance refresh replaces nodes rather than modifying them.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Deploy a DaemonSet that runs a privileged container to enforce node configuration and remove debugging tools.
Why it's wrong here
A DaemonSet cannot modify kernel parameters or system packages reliably, and it does not prevent SSH access.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse configuration management (Option A) with immutability, not realizing that periodic enforcement still allows drift and does not guarantee identical nodes at all times.
Detailed technical explanation
How to think about this question
Immutable infrastructure relies on replacing nodes rather than modifying them; a golden AMI built with Packer captures the exact OS, kernel parameters, and packages at build time. When combined with Auto Scaling groups and instance refresh, the cluster can roll out new AMI versions by terminating old instances and launching new ones, ensuring every node is identical. This pattern is fundamental to cloud-native operations and avoids the pitfalls of configuration drift that plague mutable systems.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
- →
Cloud Native Architecture — study guide chapter
Learn the concepts, then practise the questions
- →
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Targeted practice on this topic area only
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FAQ
Questions learners often ask
What does this KCNA question test?
Cloud Native Architecture — This question tests Cloud Native Architecture — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create a golden AMI using Packer with all required configurations, then use Auto Scaling groups with a launch template that references the AMI and enable instance refresh for updates. — Option C is correct because it uses a golden AMI built with Packer to create identical, immutable nodes that are reproducible via Auto Scaling groups and launch templates. This approach ensures that every EC2 instance launched has the exact same kernel parameters, packages, and configuration, eliminating configuration drift. Instance refresh allows rolling updates to the AMI without manual intervention, aligning with the goal of immutable infrastructure.
What should I do if I get this KCNA question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 11, 2026
This KCNA practice question is part of Courseiva's free CNCF 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 KCNA exam.
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