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 Kubernetes cluster upgrade procedure using kubeadm?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Drain the control plane node before upgrading it
Option A is correct because draining the control plane node before upgrading it ensures that all workloads are evicted and rescheduled to other nodes, preventing service disruption. This is a standard Kubernetes procedure where 'kubectl drain' marks the node as unschedulable and evicts pods, respecting PodDisruptionBudgets.
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.
✓
Drain the control plane node before upgrading it
Why this is correct
Draining evicts workloads so the node can be upgraded safely.
Related concept
Read the scenario before looking for a memorised answer.
✗
Downgrade the kubelet on worker nodes to match the control plane version
Why it's wrong here
Downgrading is not part of an upgrade procedure; you upgrade to a higher version.
✓
Upgrade the kubeadm binary on the node before upgrading the cluster
Why this is correct
kubeadm must be upgraded on the node to the target version before using it to upgrade the cluster.
Related concept
Read the scenario before looking for a memorised answer.
✓
Run 'kubeadm upgrade plan' to check versions and available upgrades
Why this is correct
'kubeadm upgrade plan' shows the upgrade possibilities and health checks.
Related concept
Read the scenario before looking for a memorised answer.
✗
Uncordon the node before draining it
Why it's wrong here
Uncordon allows scheduling; you should drain first, then uncordon after upgrade.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse the upgrade order (e.g., thinking you can upgrade kubelet before kubeadm) or incorrectly assume that downgrading the kubelet is acceptable, when in fact the kubelet must be at the same or newer version as the control plane, not older.
Detailed technical explanation
How to think about this question
The 'kubeadm upgrade plan' command (Option C) checks the current cluster version and lists available upgrade targets along with the versions of kubeadm, kubelet, and kubectl required. Upgrading the kubeadm binary first (Option D) is essential because kubeadm manages the upgrade process and must be at the target version to execute the upgrade commands correctly. Under the hood, kubeadm uses a phased approach: it upgrades the control plane components (API server, controller manager, scheduler) by updating static pod manifests, then upgrades the kubelet configuration on each node.
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 the control plane node before upgrading it — Option A is correct because draining the control plane node before upgrading it ensures that all workloads are evicted and rescheduled to other nodes, preventing service disruption. This is a standard Kubernetes procedure where 'kubectl drain' marks the node as unschedulable and evicts pods, respecting PodDisruptionBudgets.
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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