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.
Which THREE of the following are valid steps in a typical cluster upgrade procedure using kubeadm? (Select 3)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Upgrade kubelet and kubectl on worker nodes after upgrading the control plane
Option B is correct because in a kubeadm cluster upgrade, the control plane components (including kube-apiserver, controller-manager, and scheduler) must be upgraded first to ensure API compatibility. After the control plane is successfully upgraded, the kubelet and kubectl on worker nodes are upgraded to match the new version, as the kubelet must communicate with the upgraded API server. This sequence prevents version skew issues and maintains cluster stability.
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 the container runtime on worker nodes before the control plane
Why it's wrong here
The container runtime can be upgraded independently, but the upgrade order typically starts with control plane.
✓
Upgrade kubelet and kubectl on worker nodes after upgrading the control plane
Why this is correct
Worker nodes are upgraded after the control plane.
Related concept
Read the scenario before looking for a memorised answer.
✗
Delete all pods before upgrading
Why it's wrong here
Pods should be drained, not deleted manually.
✓
Upgrade kubeadm on the control plane node first
Why this is correct
kubeadm upgrade plan and apply are run on the control plane.
Related concept
Read the scenario before looking for a memorised answer.
✓
Drain the control plane node before upgrading it
Why this is correct
Draining ensures pods are evicted before upgrade.
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 the container runtime must be upgraded first (Option A) or that all pods must be deleted (Option C), but the CKA exam tests the official kubeadm upgrade sequence where the control plane is upgraded first, followed by worker nodes, without requiring runtime upgrades or pod deletion.
Detailed technical explanation
How to think about this question
The kubeadm upgrade process uses the `kubeadm upgrade plan` command to check available versions and the `kubeadm upgrade apply` command to upgrade the control plane. Under the hood, kubeadm updates static pod manifests for control plane components, which triggers the kubelet to restart them. Worker node upgrades involve updating the kubelet binary and running `kubeadm upgrade node` to sync the node's configuration, ensuring the kubelet version stays within the supported skew policy (typically one minor version behind the control plane).
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 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 kubelet and kubectl on worker nodes after upgrading the control plane — Option B is correct because in a kubeadm cluster upgrade, the control plane components (including kube-apiserver, controller-manager, and scheduler) must be upgraded first to ensure API compatibility. After the control plane is successfully upgraded, the kubelet and kubectl on worker nodes are upgraded to match the new version, as the kubelet must communicate with the upgraded API server. This sequence prevents version skew issues and maintains cluster stability.
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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