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 version 1.28 to 1.29. What is the correct order of steps?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Upgrade control plane nodes first, then drain each worker node before upgrading it.
Option C is correct because the Kubernetes upgrade process requires upgrading the control plane nodes first to ensure the cluster's management layer is running the new version before worker nodes are upgraded. Draining each worker node before upgrading it is essential to safely evict pods and maintain application availability, as the kubelet on the node must be stopped during the upgrade and the node must be cordoned to prevent new pods from being scheduled.
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 control plane nodes.
Why it's wrong here
Control plane must be upgraded before worker nodes to ensure API compatibility.
✗
Upgrade control plane nodes first, then upgrade worker nodes without draining them.
Why it's wrong here
Worker nodes should be drained before upgrading to minimize disruption.
✓
Upgrade control plane nodes first, then drain each worker node before upgrading it.
Why this is correct
This follows the recommended upgrade procedure: control plane first, then drain and upgrade worker nodes.
Related concept
Read the scenario before looking for a memorised answer.
✗
Upgrade all nodes simultaneously.
Why it's wrong here
Simultaneous upgrade is not recommended; control plane must be upgraded first.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think upgrading worker nodes without draining is acceptable if they use a rolling update strategy, but the CKA exam specifically tests the requirement to drain nodes before upgrading to avoid pod disruption.
Detailed technical explanation
How to think about this question
During a control plane upgrade, the kube-apiserver is updated first, followed by the controller-manager and scheduler, as the API server is the central hub for all cluster operations. The kubelet on worker nodes must be upgraded after the control plane to ensure it can communicate with the new API server version, and draining a node uses `kubectl drain` to evict pods with respect to PodDisruptionBudgets, ensuring zero-downtime for critical workloads. In real-world scenarios, failing to drain a node can lead to orphaned pods or persistent volume claims being left in an inconsistent state.
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 control plane nodes first, then drain each worker node before upgrading it. — Option C is correct because the Kubernetes upgrade process requires upgrading the control plane nodes first to ensure the cluster's management layer is running the new version before worker nodes are upgraded. Draining each worker node before upgrading it is essential to safely evict pods and maintain application availability, as the kubelet on the node must be stopped during the upgrade and the node must be cordoned to prevent new pods from being scheduled.
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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