20+ practice questions focused on Kubernetes Fundamentals — one of the most tested topics on the Kubernetes and Cloud Native Associate KCNA exam. Each question includes a detailed explanation so you learn why the right answer is correct.
Start Kubernetes Fundamentals PracticeA developer deploys a pod that continuously restarts. 'kubectl describe pod' shows the container exits with code 137. What is the most likely cause?
Explanation: Exit code 137 (128 + 9) indicates the container was killed by SIGKILL. In Kubernetes, this most commonly occurs when the container exceeds its memory limit, triggering the OOM (Out-Of-Memory) killer. The kubelet enforces the resource limits specified in the pod spec, and when memory usage surpasses the limit, the kernel terminates the process with SIGKILL, resulting in exit code 137.
An application requires a unique identifier per replica, stored in an environment variable. Which Kubernetes resource should be used to inject this identifier into each pod without manual updates?
Explanation: A StatefulSet provides stable, unique network identities and persistent storage per replica. The pod name (e.g., pod-0, pod-1) can be exposed via the Downward API or hostname. Option A is correct. Option B is wrong because Deployments create identical pods without ordering. Option C is wrong because DaemonSets run one pod per node. Option D is wrong because Jobs are for batch processing.
A pod is stuck in 'Pending' state. 'kubectl describe pod' shows '0/4 nodes are available: 4 node(s) had taint {node.kubernetes.io/unreachable: }, that the pod didn't tolerate.' What is the most likely cause?
Explanation: The taint `node.kubernetes.io/unreachable` is automatically added by the node controller when a node becomes unreachable (e.g., network failure, kubelet stops heartbeating). The error shows all 4 nodes have this taint and the pod has no matching toleration, meaning the scheduler cannot place the pod. This directly indicates all nodes are unreachable or have been cordoned (which also adds the `node.kubernetes.io/unschedulable` taint, but here the specific taint is `unreachable`).
A team wants to minimize downtime during a Deployment rollout. Which strategy ensures that new pods are created before old pods are terminated?
Explanation: Option C is correct because setting `maxSurge=1` and `maxUnavailable=0` in a RollingUpdate strategy ensures that one additional pod is created above the desired replica count before any existing pod is terminated. This guarantees zero downtime by maintaining full capacity during the rollout, as new pods become ready before old ones are removed.
A pod in a ReplicaSet is failing with 'CrashLoopBackOff'. 'kubectl logs pod' shows 'Error: listen tcp :8080: bind: address already in use'. What is the most likely cause?
Explanation: The error 'address already in use' on port 8080 indicates that when the container restarts, the previous process is still holding the port. This typically happens when the application does not handle SIGTERM properly and does not shut down within the terminationGracePeriodSeconds (default 30s), so the old process lingers while the new one tries to bind to the same port, causing a CrashLoopBackOff.
+15 more Kubernetes Fundamentals questions available
Practice all Kubernetes Fundamentals questions1. Baseline your knowledge
Start with 10 questions to gauge your current understanding of Kubernetes Fundamentals. This tells you whether you need a concept refresher or just practice.
2. Review every explanation
For each question — right or wrong — read the full explanation. Understanding why an answer is correct is more valuable than knowing the answer itself.
3. Focus on exam traps
Kubernetes Fundamentals questions on the KCNA frequently use trap wording. Look for subtle differences in answers that test your precision, not just general knowledge.
4. Reach 80% consistently
Do repeated sessions until you score 80%+ three times in a row. Then move to mixed-mode practice to test cross-topic recall under realistic conditions.
The exact number varies per candidate. Kubernetes Fundamentals is tested as part of the Kubernetes and Cloud Native Associate KCNA blueprint. Practicing with targeted Kubernetes Fundamentals questions ensures you can handle any format or difficulty that appears.
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Difficulty is subjective, but Kubernetes Fundamentals is a high-priority exam concept tested in multiple ways — direct recall, scenario analysis, and command-output interpretation. Consistent practice is the best way to build confidence.
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