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 need to upgrade a Kubernetes cluster from v1.28 to v1.29 using kubeadm. Which TWO steps are REQUIRED as part of the upgrade process? (Choose TWO.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Upgrade the control plane nodes first
Option B is correct because the Kubernetes control plane must be upgraded first to ensure the API server, controller manager, and scheduler are running the new version before worker nodes. This prevents version skew issues where newer node components might rely on API features not yet available on an older control plane. The kubeadm upgrade process explicitly requires upgrading the control plane node(s) before any worker nodes.
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.
✗
Run 'kubeadm upgrade plan' before upgrading
Why it's wrong here
While recommended, it is not strictly required; it shows available versions and upgrade steps.
✓
Upgrade the control plane nodes first
Why this is correct
Control plane must be upgraded before worker nodes.
Related concept
Read the scenario before looking for a memorised answer.
✓
Drain the node before upgrading it
Why this is correct
Draining the node evicts pods and ensures a clean upgrade.
Related concept
Read the scenario before looking for a memorised answer.
✗
Upgrade kubelet and kubeadm on the node at the same time
Why it's wrong here
On each node, you upgrade kubeadm first, then kubelet. They are upgraded sequentially, not at the same time.
✗
Upgrade all nodes simultaneously to minimize downtime
Why it's wrong here
Simultaneous upgrade can cause cluster instability; upgrade nodes one at a time.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often think 'kubeadm upgrade plan' is mandatory because it appears in many tutorials, but the CKA exam tests that only draining the node and upgrading control plane first are required steps, while the plan command is optional.
Trap categories for this question
Command / output trap
While recommended, it is not strictly required; it shows available versions and upgrade steps.
Detailed technical explanation
How to think about this question
The kubeadm upgrade process uses a 'kubeadm upgrade apply' command on the first control plane node, which updates the cluster state (etcd, API server, etc.) to the new version. Worker nodes then run 'kubeadm upgrade node' to join the upgraded cluster. The kubelet version on a node must not be more than one minor version ahead of the kube-apiserver, as per the Kubernetes version skew policy (v1.29 supports kubelet up to v1.28).
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 control plane nodes first — Option B is correct because the Kubernetes control plane must be upgraded first to ensure the API server, controller manager, and scheduler are running the new version before worker nodes. This prevents version skew issues where newer node components might rely on API features not yet available on an older control plane. The kubeadm upgrade process explicitly requires upgrading the control plane node(s) before any worker nodes.
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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