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.
A Kubernetes cluster has been running for months. Recently, some pods are reporting 'FailedScheduling' due to insufficient memory. The administrator wants to add a new node with 32GB RAM. However, after joining the node, the new node shows 'NotReady' and the kubelet logs indicate 'Failed to update node status: context deadline exceeded'. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
There is a network connectivity issue between the new node and the control plane.
The 'context deadline exceeded' error in the kubelet logs indicates that the kubelet on the new node is unable to communicate with the API server within the expected timeout. This is typically caused by network connectivity issues between the node and the control plane, such as firewall rules, incorrect DNS resolution, or a broken CNI plugin. Without successful node-to-API-server communication, the kubelet cannot post its status, leaving the node in 'NotReady' state.
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.
✗
The kubelet is not configured with the correct node IP.
Why it's wrong here
Incorrect IP would cause registration failure, not intermittent deadline exceeded.
✗
The new node does not have enough disk space for container images.
Why it's wrong here
Disk space would cause image pull failures, not node status update failures.
✓
There is a network connectivity issue between the new node and the control plane.
Why this is correct
Context deadline exceeded indicates timeout reaching the API server.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The API server is overloaded and cannot handle the node update request.
Why it's wrong here
Other nodes are fine, so API server is likely not overloaded.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'context deadline exceeded' with a resource exhaustion issue (like disk or memory) or a kubelet configuration error, when in fact it is a classic symptom of network connectivity failure between the node and the control plane.
Detailed technical explanation
How to think about this question
The kubelet uses a periodic sync loop (default 10s) to post node status to the API server via the /api/v1/nodes/<node-name>/status endpoint. The 'context deadline exceeded' error arises when the HTTP request to the API server does not complete within the kubelet's configured timeout (default 5s). This often occurs due to network misconfiguration, such as missing routes, incorrect kubelet --node-ip, or a non-functional container network interface (CNI) that prevents the node from reaching the control plane's IP or service cluster IP.
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: There is a network connectivity issue between the new node and the control plane. — The 'context deadline exceeded' error in the kubelet logs indicates that the kubelet on the new node is unable to communicate with the API server within the expected timeout. This is typically caused by network connectivity issues between the node and the control plane, such as firewall rules, incorrect DNS resolution, or a broken CNI plugin. Without successful node-to-API-server communication, the kubelet cannot post its status, leaving the node in 'NotReady' state.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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