CKA Practice Question: Cluster Architecture, Installation & Configuration
This CKA practice question tests your understanding of cluster architecture, installation & configuration. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Exhibit
```
$ kubectl get csr
NAME AGE SIGNERNAME REQUESTOR REQUESTDURATION CONDITION
csr-node2 10m kubernetes.io/kube-apiserver-client-kubelet kubelet-bootstrap <none> Pending
$ kubectl describe csr csr-node2
Name: csr-node2
Labels: <none>
Annotations: <none>
CreationTimestamp: Mon, 01 Jan 2024 12:00:00 +0000
Requesting User: kubelet-bootstrap
Signer: kubernetes.io/kube-apiserver-client-kubelet
Status: Pending
Subject:
Common Name: system:node:node2
Organization: system:nodes
Groups:
system:nodes
system:authenticated
$ kubectl get nodes
NAME STATUS ROLES AGE VERSION
master Ready control-plane,master 10d v1.28.0
node1 Ready <none> 10d v1.28.0
node2 NotReady <none> 1m v1.28.0
```
Refer to the exhibit. A new worker node (node2) has been added to the cluster. It shows NotReady status, and a CertificateSigningRequest (CSR) is pending. What step must the cluster administrator take to make node2 ready?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Approve the pending CSR using 'kubectl certificate approve csr-node2'.
When a new node joins, the kubelet creates a CSR for its client certificate. The CSR must be approved by an administrator (or automatically via a controller). Until approved, the node cannot authenticate and remains NotReady.
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.
✓
Approve the pending CSR using 'kubectl certificate approve csr-node2'.
Why this is correct
Correct. The CSR must be approved to allow the node to obtain a certificate and join the cluster.
Related concept
Read the scenario before looking for a memorised answer.
✗
Run 'kubeadm join' again with the correct token.
Why it's wrong here
Incorrect. The CSR is pending, meaning the join command already ran but the certificate approval is missing.
✗
Add the node's IP to the API server's TLS certificate.
Why it's wrong here
Incorrect. The API server's certificate does not need to include worker node IPs; the CSR is for the node's client certificate.
✗
Restart the kubelet on node2.
Why it's wrong here
Incorrect. Restarting kubelet will not approve the CSR; it will just re-request the same pending CSR.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Trap categories for this question
Command / output trap
Incorrect. The CSR is pending, meaning the join command already ran but the certificate approval is missing.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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.
Identify which CKA exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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: Approve the pending CSR using 'kubectl certificate approve csr-node2'. — When a new node joins, the kubelet creates a CSR for its client certificate. The CSR must be approved by an administrator (or automatically via a controller). Until approved, the node cannot authenticate and remains NotReady.
What should I do if I get this CKA question wrong?
Identify which CKA exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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