CKA Practice Question: Cluster Architecture, Installation and Configuration
This CKA practice question tests your understanding of cluster architecture, installation and configuration. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 preparing to upgrade a Kubernetes cluster from v1.27 to v1.28 using kubeadm. What is the correct order of operations for upgrading the control plane nodes?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Upgrade the first control plane node, then upgrade the remaining control plane nodes, then upgrade worker nodes.
Option B is correct because the recommended upgrade order for a kubeadm-managed cluster is to upgrade the first control plane node (using `kubeadm upgrade apply`), then the remaining control plane nodes (using `kubeadm upgrade node`), and finally the worker nodes. This ensures the cluster's control plane components (etcd, kube-apiserver, kube-controller-manager, kube-scheduler) are updated first, maintaining cluster stability and API server availability during the process.
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.
✗
Upgrade all worker nodes first, then upgrade the control plane nodes.
Why it's wrong here
Worker nodes should be upgraded after the control plane is fully upgraded.
✓
Upgrade the first control plane node, then upgrade the remaining control plane nodes, then upgrade worker nodes.
Why this is correct
This is the standard kubeadm upgrade procedure: control plane first, then workers.
Related concept
Read the scenario before looking for a memorised answer.
✗
Upgrade all nodes simultaneously by running kubeadm upgrade apply on all nodes at once.
Why it's wrong here
Upgrading all nodes simultaneously is not supported; control plane must be upgraded first.
✗
Upgrade worker nodes, then upgrade the control plane nodes, then drain the worker nodes.
Why it's wrong here
Draining is part of the upgrade process but worker nodes should be upgraded after the control plane.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think upgrading all nodes simultaneously is faster or that worker nodes should be upgraded first to avoid downtime, but the CKA expects strict adherence to the kubeadm upgrade workflow where control plane nodes must be upgraded before worker nodes.
Detailed technical explanation
How to think about this question
The upgrade process leverages the Kubernetes version skew policy, which allows kubelets to be up to two minor versions older than the kube-apiserver. By upgrading the control plane first, the API server is updated to v1.28, while worker nodes can remain on v1.27 temporarily without breaking functionality. The `kubeadm upgrade apply` command automatically handles the upgrade of the etcd cluster if it is stacked (co-located with control plane components), and it updates the kubeconfig files and static pod manifests for the new version.
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 practitioner preparing for the CKA exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CKA question in full detail.
Cluster Architecture, Installation and Configuration — This question tests Cluster Architecture, Installation and Configuration — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Upgrade the first control plane node, then upgrade the remaining control plane nodes, then upgrade worker nodes. — Option B is correct because the recommended upgrade order for a kubeadm-managed cluster is to upgrade the first control plane node (using `kubeadm upgrade apply`), then the remaining control plane nodes (using `kubeadm upgrade node`), and finally the worker nodes. This ensures the cluster's control plane components (etcd, kube-apiserver, kube-controller-manager, kube-scheduler) are updated first, maintaining cluster stability and API server availability during the process.
What should I do if I get this CKA 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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