This KCNA practice question tests your understanding of container orchestration. 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 a single control plane node and two worker nodes. The control plane node fails. What is the immediate impact on the workloads running on the worker nodes?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Existing workloads continue running, but no new pods can be scheduled
Option B is correct because in Kubernetes, the control plane is responsible for scheduling new pods and maintaining desired state via the API server, controller manager, and scheduler. When the control plane fails, the kubelets on worker nodes continue to run existing pods based on their local state, but the scheduler cannot assign new pods to nodes, and the API server is unavailable for updates or scaling operations.
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.
✗
All workloads will stop immediately
Why it's wrong here
Workloads continue to run; only management functions are affected.
✓
Existing workloads continue running, but no new pods can be scheduled
Why this is correct
The kubelet on worker nodes keeps existing pods running, but the scheduler cannot assign new pods without the control plane.
Related concept
Read the scenario before looking for a memorised answer.
✗
The kubelet on worker nodes will restart all pods
Why it's wrong here
The kubelet maintains the current state; it does not restart pods automatically.
✗
Workloads will be automatically migrated to another cluster
Why it's wrong here
Kubernetes does not automatically migrate workloads to another cluster.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CNCF often tests the misconception that the control plane is required for all pod operations, leading candidates to assume workloads stop immediately, when in fact the kubelet provides resilience for existing pods.
Detailed technical explanation
How to think about this question
Under the hood, the kubelet uses a local pod manifest cache and continues to enforce the pod's restart policy (e.g., Always, OnFailure) even when the API server is unreachable. However, the kubelet cannot report pod status changes or receive new pod assignments, so the cluster's desired state becomes stale. In a real-world scenario, if a pod crashes on a worker node while the control plane is down, the kubelet will restart it locally, but if the node itself fails, the pod is lost because there is no controller to reschedule it.
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 KCNA 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 KCNA question in full detail.
Container Orchestration — This question tests Container Orchestration — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Existing workloads continue running, but no new pods can be scheduled — Option B is correct because in Kubernetes, the control plane is responsible for scheduling new pods and maintaining desired state via the API server, controller manager, and scheduler. When the control plane fails, the kubelets on worker nodes continue to run existing pods based on their local state, but the scheduler cannot assign new pods to nodes, and the API server is unavailable for updates or scaling operations.
What should I do if I get this KCNA 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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