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 upgrading a Kubernetes cluster from v1.29.0 to v1.30.0 using kubeadm. What is the correct sequence of operations?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Drain control plane node, upgrade kubeadm, kubelet, kubectl, uncordon, then repeat for worker nodes
Option D is correct because upgrading a Kubernetes cluster with kubeadm requires a sequential, node-by-node approach starting with the control plane. The control plane node must be drained to evict workloads, then kubeadm, kubelet, and kubectl are upgraded, and the node is uncordoned before moving to worker nodes. This ensures the cluster control plane remains available and worker nodes are upgraded only after the control plane is stable, preventing cluster downtime.
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 kubeadm on all nodes, then upgrade kubelet on each node without draining
Why it's wrong here
Drain before upgrade to avoid disruption.
✗
Upgrade all nodes simultaneously
Why it's wrong here
Control plane must be upgraded first.
✗
Upgrade worker nodes first, then control plane nodes
Why it's wrong here
Control plane nodes should be upgraded before worker nodes.
✓
Drain control plane node, upgrade kubeadm, kubelet, kubectl, uncordon, then repeat for worker nodes
Why this is correct
This is the correct order: drain control plane, upgrade, uncordon, then workers.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume worker nodes can be upgraded first to minimize control plane downtime, but the CKA tests the strict kubeadm upgrade sequence where the control plane must be upgraded before worker nodes to maintain cluster stability and API version compatibility.
Detailed technical explanation
How to think about this question
The kubeadm upgrade process uses a version skew policy where kubelet can be up to two minor versions older than kube-apiserver, but during an upgrade, the control plane components must be updated first to maintain API compatibility. The `kubeadm upgrade plan` command checks the upgrade path and ensures the cluster can be upgraded without breaking core components like etcd or the scheduler. In a real-world scenario, failing to drain the control plane node can cause critical system pods (e.g., CoreDNS, kube-proxy) to be disrupted, leading to DNS resolution failures across the cluster.
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: Drain control plane node, upgrade kubeadm, kubelet, kubectl, uncordon, then repeat for worker nodes — Option D is correct because upgrading a Kubernetes cluster with kubeadm requires a sequential, node-by-node approach starting with the control plane. The control plane node must be drained to evict workloads, then kubeadm, kubelet, and kubectl are upgraded, and the node is uncordoned before moving to worker nodes. This ensures the cluster control plane remains available and worker nodes are upgraded only after the control plane is stable, preventing cluster downtime.
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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