This CKS practice question tests your understanding of cluster setup. 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 THREE of the following are required when setting up a Kubernetes control plane with kubeadm for a production environment?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Ensure the Kubernetes version is not downgraded
Option A is correct because kubeadm enforces a strict version skew policy: the kubelet version must not be newer than the control plane version, and downgrading the control plane (e.g., from v1.28 to v1.27) is not supported. Attempting a downgrade can lead to API version mismatches, schema incompatibilities, and cluster instability. In production, you must plan upgrades carefully and never downgrade the control plane components.
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.
✓
Ensure the Kubernetes version is not downgraded
Why this is correct
kubeadm prevents downgrading.
Related concept
Read the scenario before looking for a memorised answer.
✓
Specify --pod-network-cidr to define the pod network range
Why this is correct
Required for pod networking.
Related concept
Read the scenario before looking for a memorised answer.
✓
Specify --control-plane-endpoint for high availability
Why this is correct
Required for HA control plane setup.
Related concept
Read the scenario before looking for a memorised answer.
✗
Specify --apiserver-advertise-address
Why it's wrong here
Optional; kubeadm auto-detects.
✗
Generate a bootstrap token with kubeadm token create
Why it's wrong here
Token is for joining nodes, not for control plane init.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CNCF often tests the misconception that --apiserver-advertise-address is mandatory for all control plane setups, but it is only needed when the node has multiple network interfaces or you need to override the default IP detection.
Detailed technical explanation
How to think about this question
The --pod-network-cidr flag (Option B) is required because it tells kubeadm to allocate a CIDR range for pod IPs (e.g., 10.244.0.0/16), which is essential for CNI plugins like Flannel or Calico to assign addresses without overlap. The --control-plane-endpoint flag (Option C) is mandatory for high availability setups because it provides a stable DNS name or load balancer IP that all control plane nodes and kubelets use to reach the API server, enabling seamless failover. Under the hood, kubeadm writes this endpoint into the kubeconfig and certificate SANs, so omitting it would break multi-node HA.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CKS question in full detail.
Cluster Setup — This question tests Cluster Setup — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Ensure the Kubernetes version is not downgraded — Option A is correct because kubeadm enforces a strict version skew policy: the kubelet version must not be newer than the control plane version, and downgrading the control plane (e.g., from v1.28 to v1.27) is not supported. Attempting a downgrade can lead to API version mismatches, schema incompatibilities, and cluster instability. In production, you must plan upgrades carefully and never downgrade the control plane components.
What should I do if I get this CKS question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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