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Exam Code: KCNA
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Kubernetes and Cloud Native Associate KCNA Practice Test 34

Question 330

A Kubernetes platform team observes this situation: A Pod is too large for every node and priority preemption fails to fix it. Which action BEST addresses the requirement?

  1. Use a nodeSelector or required node affinity matching that label
  2. Right-size its requests or provide a node pool with adequate allocatable capacity
  3. Apply required Pod anti-affinity using a node topology key
  4. Review memory limits against peak needs and adjust efficient application behavior

Explanation

Correct Answer

B:

Right-size its requests or provide a node pool with adequate allocatable capacity. This is appropriate for the described asset and control gap because preemption cannot create a sufficiently large node from several small nodes. If the issue is left untreated, evicting smaller Pods blindly may disrupt services without making room. An assessor can verify remediation when the Pod fits the capacity of an eligible node and schedules without excess disruption.

Incorrect Answers

A:

Use a nodeSelector or required node affinity matching that label. The operation “Use a nodeSelector or required node affinity matching that label” does not address the particular Kubernetes requirement “Right-size its requests or provide a node pool with adequate allocatable capacity”.

C:

Apply required Pod anti-affinity using a node topology key. The operation “Apply required Pod anti-affinity using a node topology key” does not address the particular Kubernetes requirement “Right-size its requests or provide a node pool with adequate allocatable capacity”.

D:

Review memory limits against peak needs and adjust efficient application behavior. The operation “Review memory limits against peak needs and adjust efficient application behavior” does not address the particular Kubernetes requirement “Right-size its requests or provide a node pool with adequate allocatable capacity”.

Question 331

The team has not corrected this condition: A deployment repeatedly OOMKills when traffic surges above its memory limit. Which risk is MOST relevant?

  1. Forcing a Pod onto another zone can leave the volume unattached
  2. An undefined topology domain can lead to unexpected scheduling outcomes
  3. Raising CPU requests alone will not prevent memory-related kills
  4. A replica count alone does not ensure zone diversity

Explanation

Correct Answer

C:

Raising CPU requests alone will not prevent memory-related kills. This is the direct concern in the stated scenario because exceeding a container memory limit can trigger termination independent of CPU usage. The matching mitigation is to review memory limits against peak needs and adjust efficient application behavior. Successful verification would show that the container stays within a tested memory budget and avoids OOMKilled restarts.

Incorrect Answers

A:

Persistent storage topology can limit where a Pod may safely start. That explains the warning “Forcing a Pod onto another zone can leave the volume unattached”; this case instead concerns “Raising CPU requests alone will not prevent memory-related kills”. Exceeding a container memory limit can trigger termination independent of CPU usage.

B:

Affinity decisions depend on consistent node topology-key labels. That explains the warning “An undefined topology domain can lead to unexpected scheduling outcomes”; this case instead concerns “Raising CPU requests alone will not prevent memory-related kills”. Exceeding a container memory limit can trigger termination independent of CPU usage.

D:

Topology spread helps distribute matching Pods across failure domains. That explains the warning “A replica count alone does not ensure zone diversity”; this case instead concerns “Raising CPU requests alone will not prevent memory-related kills”. Exceeding a container memory limit can trigger termination independent of CPU usage.

Question 332

Given the requirement "A developer says creating a Service automatically provides end-to-end transport encryption", the proposed fix is "Use application TLS or an approved mesh policy for required encrypted connections". Which principle explains why it works?

  1. ClusterIP exposes an in-cluster virtual service endpoint by default
  2. CNI plugins configure Pod network connectivity across the cluster
  3. Dual-stack configuration controls IPv4 and IPv6 allocation and Service behavior
  4. A Kubernetes Service is an abstraction for reachability, not inherent encryption

Explanation

Correct Answer

D:

A Kubernetes Service is an abstraction for reachability, not inherent encryption. That principle directly explains the selected remediation, use application TLS or an approved mesh policy for required encrypted connections, for this case. Without the distinction, sending credentials over an unencrypted Service path can expose them on the network. The expected confirmation is that a packet capture confirms TLS-protected sessions between service endpoints.

Incorrect Answers

A:

ClusterIP exposes an in-cluster virtual service endpoint by default. The operation “ClusterIP exposes an in-cluster virtual service endpoint by default” does not address the particular Kubernetes requirement “A Kubernetes Service is an abstraction for reachability, not inherent encryption”.

B:

CNI plugins configure Pod network connectivity across the cluster. The operation “CNI plugins configure Pod network connectivity across the cluster” does not address the particular Kubernetes requirement “A Kubernetes Service is an abstraction for reachability, not inherent encryption”.

C:

Dual-stack configuration controls IPv4 and IPv6 allocation and Service behavior. The operation “Dual-stack configuration controls IPv4 and IPv6 allocation and Service behavior” does not address the particular Kubernetes requirement “A Kubernetes Service is an abstraction for reachability, not inherent encryption”.

Question 333

A Kubernetes platform team observes this situation: An auditor must reconstruct who changed a critical cluster role during an incident. Which action BEST addresses the requirement?

  1. Enable appropriate control-plane audit logging with protected retention
  2. Create a dedicated minimally privileged service account and binding
  3. Configure supported Pod Security Admission labels and verify enforcement levels
  4. Grant a namespaced Role and RoleBinding containing only read verbs

Explanation

Correct Answer

A:

Enable appropriate control-plane audit logging with protected retention. This is appropriate for the described asset and control gap because kubernetes audit records provide context on authenticated API requests. If the issue is left untreated, application stdout alone does not identify every control-plane authorization change. An assessor can verify remediation when a test role modification has an auditable actor and request record.

Incorrect Answers

B:

Create a dedicated minimally privileged service account and binding. The operation “Create a dedicated minimally privileged service account and binding” does not address the particular Kubernetes requirement “Enable appropriate control-plane audit logging with protected retention”.

C:

Configure supported Pod Security Admission labels and verify enforcement levels. The operation “Configure supported Pod Security Admission labels and verify enforcement levels” does not address the particular Kubernetes requirement “Enable appropriate control-plane audit logging with protected retention”.

D:

Grant a namespaced Role and RoleBinding containing only read verbs. The operation “Grant a namespaced Role and RoleBinding containing only read verbs” does not address the particular Kubernetes requirement “Enable appropriate control-plane audit logging with protected retention”.

Question 334

A platform engineer recommends: Apply preferred node affinity with a documented scheduling weight. The original problem is: A reporting workload prefers a low-cost node pool but can run elsewhere. Which concept explains the remedy?

  1. Topology spread helps distribute matching Pods across failure domains
  2. Preferred scheduling preferences rank candidates without making placement mandatory
  3. Affinity decisions depend on consistent node topology-key labels
  4. Pod anti-affinity can keep matching Pods on separate topology domains

Explanation

Correct Answer

B:

Preferred scheduling preferences rank candidates without making placement mandatory. That principle directly explains the selected remediation, apply preferred node affinity with a documented scheduling weight, for this case. Without the distinction, using a hard requirement can leave the service Pending during capacity shortage. The expected confirmation is that the scheduler chooses preferred nodes when available and falls back otherwise.

Incorrect Answers

A:

Topology spread helps distribute matching Pods across failure domains. The operation “Topology spread helps distribute matching Pods across failure domains” does not address the particular Kubernetes requirement “Preferred scheduling preferences rank candidates without making placement mandatory”.

C:

Affinity decisions depend on consistent node topology-key labels. The operation “Affinity decisions depend on consistent node topology-key labels” does not address the particular Kubernetes requirement “Preferred scheduling preferences rank candidates without making placement mandatory”.

D:

Pod anti-affinity can keep matching Pods on separate topology domains. The operation “Pod anti-affinity can keep matching Pods on separate topology domains” does not address the particular Kubernetes requirement “Preferred scheduling preferences rank candidates without making placement mandatory”.

Question 335

Consider this Kubernetes scenario: A local developer needs temporary access to a private Pod port for diagnosis. What is the BEST next action?

  1. Use kubectl debug or a suitable ephemeral debug container where permitted
  2. Add a suitable liveness probe with safe thresholds for recovery
  3. Use a scoped kubectl port-forward session and terminate it after testing
  4. Inspect container restart count, previous logs, and termination reason

Explanation

Correct Answer

C:

Use a scoped kubectl port-forward session and terminate it after testing. This is appropriate for the described asset and control gap because port forwarding establishes an explicit temporary API-mediated connection path. If the issue is left untreated, exposing the service publicly for local debugging can introduce unnecessary access. An assessor can verify remediation when the local probe succeeds while no new externally reachable Service is created.

Incorrect Answers

A:

Use kubectl debug or a suitable ephemeral debug container where permitted. The operation “Use kubectl debug or a suitable ephemeral debug container where permitted” does not address the particular Kubernetes requirement “Use a scoped kubectl port-forward session and terminate it after testing”.

B:

Add a suitable liveness probe with safe thresholds for recovery. The operation “Add a suitable liveness probe with safe thresholds for recovery” does not address the particular Kubernetes requirement “Use a scoped kubectl port-forward session and terminate it after testing”.

D:

Inspect container restart count, previous logs, and termination reason. The operation “Inspect container restart count, previous logs, and termination reason” does not address the particular Kubernetes requirement “Use a scoped kubectl port-forward session and terminate it after testing”.

Question 336

A team implemented the proposed remedy for this problem: A rollout appears stalled and business owners need to know whether it has completed. Which evidence BEST shows it works?

  1. The inventory includes deployments from each permitted namespace
  2. The reported warning identifies the blocked scheduling or image-pull step
  3. The command returns only payments resources and excludes other namespaces
  4. The rollout reaches completion only after updated replicas satisfy readiness

Explanation

Correct Answer

D:

The rollout reaches completion only after updated replicas satisfy readiness. This is stronger than observing a saved configuration because it tests the actual outcome of check Deployment rollout status and its progressing and available conditions. The underlying principle is that rollout observability distinguishes declared updates from successful availability. The original risk was that a successful manifest apply does not guarantee replacement Pods became healthy.

Incorrect Answers

A:

The default kubectl namespace view excludes resources in other namespaces. The observation “The inventory includes deployments from each permitted namespace” would validate that property, rather than the required “The rollout reaches completion only after updated replicas satisfy readiness”. Rollout observability distinguishes declared updates from successful availability.

B:

Object descriptions expose controller and scheduler diagnostics beyond names and phases. The observation “The reported warning identifies the blocked scheduling or image-pull step” would validate that property, rather than the required “The rollout reaches completion only after updated replicas satisfy readiness”. Rollout observability distinguishes declared updates from successful availability.

C:

Namespaced API queries avoid mixing identical resource names from other teams. The observation “The command returns only payments resources and excludes other namespaces” would validate that property, rather than the required “The rollout reaches completion only after updated replicas satisfy readiness”. Rollout observability distinguishes declared updates from successful availability.

Question 337

A platform engineer recommends: Use a NodePort Service when this exposure model is explicitly appropriate. The original problem is: Operators require temporary direct access to an application through each worker node address. Which concept explains the remedy?

  1. NodePort makes a selected port accessible via nodes and forwards to the Service
  2. CNI plugins configure Pod network connectivity across the cluster
  3. HTTP routing objects require a working controller to implement actual data-plane behavior
  4. Egress-deny policies also affect support dependencies such as DNS resolution

Explanation

Correct Answer

A:

NodePort makes a selected port accessible via nodes and forwards to the Service. That principle directly explains the selected remediation, use a NodePort Service when this exposure model is explicitly appropriate, for this case. Without the distinction, assuming NodePort is a private-only endpoint can expose unintended access. The expected confirmation is that requests to approved node ports reach the correct backend under firewall controls.

Incorrect Answers

B:

CNI plugins configure Pod network connectivity across the cluster. The operation “CNI plugins configure Pod network connectivity across the cluster” does not address the particular Kubernetes requirement “NodePort makes a selected port accessible via nodes and forwards to the Service”.

C:

HTTP routing objects require a working controller to implement actual data-plane behavior. The operation “HTTP routing objects require a working controller to implement actual data-plane behavior” does not address the particular Kubernetes requirement “NodePort makes a selected port accessible via nodes and forwards to the Service”.

D:

Egress-deny policies also affect support dependencies such as DNS resolution. The operation “Egress-deny policies also affect support dependencies such as DNS resolution” does not address the particular Kubernetes requirement “NodePort makes a selected port accessible via nodes and forwards to the Service”.

Question 338

Consider this Kubernetes scenario: A new hire wants to use cloud-native projects but cannot distinguish maintainers from end users. What is the BEST next action?

  1. Follow Kubernetes release notes, enhancement proposals, and SIG documentation
  2. Describe contributor, maintainer, adopter, and platform operator responsibilities
  3. Review actual project scope, maturity, licensing, and stewardship before adoption
  4. Submit a reproducible issue and reviewed pull request following project contribution rules

Explanation

Correct Answer

B:

Describe contributor, maintainer, adopter, and platform operator responsibilities. This is appropriate for the described asset and control gap because community roles and technical roles have different ownership and decision rights. If the issue is left untreated, assuming every user can approve an upstream release obscures project governance. An assessor can verify remediation when an onboarding guide maps each responsibility to the appropriate project process.

Incorrect Answers

A:

Follow Kubernetes release notes, enhancement proposals, and SIG documentation. The operation “Follow Kubernetes release notes, enhancement proposals, and SIG documentation” does not address the particular Kubernetes requirement “Describe contributor, maintainer, adopter, and platform operator responsibilities”.

C:

Review actual project scope, maturity, licensing, and stewardship before adoption. The operation “Review actual project scope, maturity, licensing, and stewardship before adoption” does not address the particular Kubernetes requirement “Describe contributor, maintainer, adopter, and platform operator responsibilities”.

D:

Submit a reproducible issue and reviewed pull request following project contribution rules. The operation “Submit a reproducible issue and reviewed pull request following project contribution rules” does not address the particular Kubernetes requirement “Describe contributor, maintainer, adopter, and platform operator responsibilities”.

Question 339

A Kubernetes platform team observes this situation: A batch conversion should run to completion once and a cleanup must repeat nightly. Which action BEST addresses the requirement?

  1. Update the desired-state manifest or controlling resource instead of manual drift
  2. Use the Kubernetes API server rather than editing etcd or node files directly
  3. Use a Job for completion work and a CronJob for the recurring schedule
  4. Inspect kubelet health and container-runtime interaction on the assigned node

Explanation

Correct Answer

C:

Use a Job for completion work and a CronJob for the recurring schedule. This is appropriate for the described asset and control gap because jobs manage finite tasks while CronJobs create Jobs on a time schedule. If the issue is left untreated, long-running Deployments do not naturally model completion or scheduled batch execution. An assessor can verify remediation when one conversion reaches Complete and the next scheduled cleanup Job is created.

Incorrect Answers

A:

Update the desired-state manifest or controlling resource instead of manual drift. The operation “Update the desired-state manifest or controlling resource instead of manual drift” does not address the particular Kubernetes requirement “Use a Job for completion work and a CronJob for the recurring schedule”.

B:

Use the Kubernetes API server rather than editing etcd or node files directly. The operation “Use the Kubernetes API server rather than editing etcd or node files directly” does not address the particular Kubernetes requirement “Use a Job for completion work and a CronJob for the recurring schedule”.

D:

Inspect kubelet health and container-runtime interaction on the assigned node. The operation “Inspect kubelet health and container-runtime interaction on the assigned node” does not address the particular Kubernetes requirement “Use a Job for completion work and a CronJob for the recurring schedule”.

Question 340

A cloud-native operations team faces this condition: A namespace quota rejects a new Pod despite a node with free capacity. Which response is MOST appropriate?

  1. Inspect requested CPU and node allocatable resources before changing placement
  2. Give the approved agent a matching toleration and restrict other workloads
  3. Combine required node affinity with the correct tolerations for the isolated pool
  4. Check ResourceQuota usage and the Pod's requested resources

Explanation

Correct Answer

D:

Check ResourceQuota usage and the Pod's requested resources. This is appropriate for the described asset and control gap because admission quota checks operate independently from node scheduling capacity. If the issue is left untreated, increasing the number of nodes does not automatically increase namespace quota. An assessor can verify remediation when the namespace receives approved quota capacity and the Pod is admitted.

Incorrect Answers

A:

Inspect requested CPU and node allocatable resources before changing placement. The operation “Inspect requested CPU and node allocatable resources before changing placement” does not address the particular Kubernetes requirement “Check ResourceQuota usage and the Pod's requested resources”.

B:

Give the approved agent a matching toleration and restrict other workloads. The operation “Give the approved agent a matching toleration and restrict other workloads” does not address the particular Kubernetes requirement “Check ResourceQuota usage and the Pod's requested resources”.

C:

Combine required node affinity with the correct tolerations for the isolated pool. The operation “Combine required node affinity with the correct tolerations for the isolated pool” does not address the particular Kubernetes requirement “Check ResourceQuota usage and the Pod's requested resources”.

Kubernetes and Cloud Native Associate (KCNA) Practice Tests

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