CKA Practice Question: Cluster Architecture, Installation & Configuration
This CKA practice question tests your understanding of cluster architecture, installation & 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 TWO of the following are valid methods to add a worker node to an existing Kubernetes cluster that was initialized with kubeadm?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use kubeadm token create and then kubeadm join with the token
Option A is correct because `kubeadm token create` generates a bootstrap token that is used by `kubeadm join` to authenticate the new node with the control plane. This is the standard, documented method for adding worker nodes to a cluster initialized with kubeadm, leveraging TLS bootstrap and the Bootstrap Token Authentication protocol.
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.
✓
Use kubeadm token create and then kubeadm join with the token
Why this is correct
This is the standard method to join a worker node.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use kubectl create node command from the control plane
Why it's wrong here
There is no kubectl create node command.
✓
Copy the kubeconfig file and manually configure kubelet with the cluster CA and bootstrap token
Why this is correct
This is a valid manual method.
Related concept
Read the scenario before looking for a memorised answer.
✗
Install kubelet on the worker node and it will automatically join the cluster
Why it's wrong here
kubelet needs to be configured with a bootstrap token or kubeconfig to join.
✗
Run kubeadm init on the worker node and then join
Why it's wrong here
kubeadm initializes a control plane, not a worker node.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse `kubeadm init` (for control plane nodes) with `kubeadm join` (for worker nodes), and assume that simply installing kubelet is sufficient for automatic cluster discovery without any authentication configuration.
Trap categories for this question
Command / output trap
There is no kubectl create node command.
Detailed technical explanation
How to think about this question
The bootstrap token used in `kubeadm join` is a bearer token stored as a Secret in the `kube-system` namespace, and the kubelet uses TLS bootstrapping to request a client certificate from the control plane. In production, tokens have a TTL (default 24 hours) and can be rotated; the manual method in Option C (copying kubeconfig and configuring kubelet) is valid but less common, as it bypasses the automatic certificate signing process and is typically used for static node configuration.
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 & Configuration — This question tests Cluster Architecture, Installation & Configuration — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use kubeadm token create and then kubeadm join with the token — Option A is correct because `kubeadm token create` generates a bootstrap token that is used by `kubeadm join` to authenticate the new node with the control plane. This is the standard, documented method for adding worker nodes to a cluster initialized with kubeadm, leveraging TLS bootstrap and the Bootstrap Token Authentication protocol.
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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