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CNCF CKA Practice Test 17

Question 160

At Northstar finance, in an isolated training cluster during a scheduled maintenance rehearsal: Node worker-a has passed maintenance checks and must accept normal new workloads again. Work only within the stated target and verify before declaring success. Which operational control most directly prevents this failure or configuration drift?

  1. Reserve and govern security-sensitive scheduling labels through controlled change procedures.
  2. Review service-account subjects when workloads or bindings are renamed.
  3. Include schedulability restoration in maintenance completion checklists.
  4. Store join credentials only in approved short-lived channels and verify the new node is assigned to the intended cluster.

Explanation

Correct Answer

C:

Include schedulability restoration in maintenance completion checklists. This reduces recurrence of the specific operational failure. It reinforces the action: Run kubectl uncordon worker-a. The relevant mechanism is: Uncordon clears the Node's unschedulable status; it does not guarantee any particular Pod will be placed there.

Incorrect Answers

A:

That safeguard is relevant to: Node labels are discoverable metadata matched by selectors; a node label alone does not create a workload restriction. The current failure instead follows from: Uncordon clears the Node's unschedulable status; it does not guarantee any particular Pod will be placed there. Its prevention measure is “Include schedulability restoration in maintenance completion checklists”.

B:

This routine guards against another mechanism: A RoleBinding associates the service account subject with a Role inside the binding namespace. The recurring exposure in the current case is: Uncordon clears the Node's unschedulable status; it does not guarantee any particular Pod will be placed there. The matching preventive check is “Include schedulability restoration in maintenance completion checklists”.

D:

That safeguard is relevant to: A worker joins through trusted control-plane discovery and TLS bootstrap; a random API endpoint or mismatched CA hash is unsafe. The current failure instead follows from: Uncordon clears the Node's unschedulable status; it does not guarantee any particular Pod will be placed there. Its prevention measure is “Include schedulability restoration in maintenance completion checklists”.

Question 161

At Horizon observability, in a disposable simulated environment during a monitored release window: Node worker-b has passed maintenance checks and must accept normal new workloads again. Work only within the stated target and verify before declaring success. Which command or initial safe diagnostic step best addresses the stated lab task?

  1. Run kubectl uncordon worker-b.
  2. Run kubectl create namespace observability and then kubectl label namespace observability owner=platform --overwrite.
  3. Run kubectl -n observability create quota metrics-api-cpu --hard=requests.cpu=6 after checking no conflicting quota exists.
  4. Run kubectl taint nodes worker-b special=dedicated:NoSchedule-.

Explanation

Correct Answer

A:

Run kubectl uncordon worker-b. This is the appropriate command-line action or first safe diagnostic. The technical reason is: Uncordon clears the Node's unschedulable status; it does not guarantee any particular Pod will be placed there. Validate the result with: Run kubectl get node worker-b and verify that SchedulingDisabled is absent. Execute changes only in an authorized disposable lab or after normal production change controls.

Incorrect Answers

B:

The proposed action belongs to the mechanism: A Namespace supplies a scope for namespaced resources while its metadata labels support policy and inventory selectors. Here the stated fault follows a different mechanism: Uncordon clears the Node's unschedulable status; it does not guarantee any particular Pod will be placed there. The corrective choice is “Run kubectl uncordon worker-b”.

C:

The offered action targets: A ResourceQuota caps combined admitted requests in a namespace; per-Pod limits alone do not enforce a namespace-wide budget. The case facts point instead to: Uncordon clears the Node's unschedulable status; it does not guarantee any particular Pod will be placed there. Implement “Run kubectl uncordon worker-b” to address that specific condition.

D:

This alternative is a response to another technical cause: A trailing minus removes the matching taint; adding a new toleration on every Pod would leave unnecessary cluster constraints. The reported case instead depends on: Uncordon clears the Node's unschedulable status; it does not guarantee any particular Pod will be placed there. The action that directly addresses it is “Run kubectl uncordon worker-b”.

Question 162

At Horizon observability, in a disposable simulated environment during a monitored release window: Node worker-b has passed maintenance checks and must accept normal new workloads again. Work only within the stated target and verify before declaring success. Which Kubernetes behavior best explains the required change or diagnosis?

  1. Nodes are cluster-scoped and their access rules belong in a ClusterRole rather than a namespaced Role.
  2. Uncordon clears the Node's unschedulable status; it does not guarantee any particular Pod will be placed there.
  3. Node labels are discoverable metadata matched by selectors; a node label alone does not create a workload restriction.
  4. A namespaced Role expresses allowed resource verbs; it has no effect until a RoleBinding associates a subject.

Explanation

Correct Answer

B:

Uncordon clears the Node's unschedulable status; it does not guarantee any particular Pod will be placed there. This explains the stated condition. The corresponding action is: Run kubectl uncordon worker-b. The direct acceptance evidence is: Run kubectl get node worker-b and verify that SchedulingDisabled is absent.

Incorrect Answers

A:

Nodes are cluster-scoped and their access rules belong in a ClusterRole rather than a namespaced Role. That explanation applies to a different technical failure. Here the controlling principle is: Uncordon clears the Node's unschedulable status; it does not guarantee any particular Pod will be placed there.

C:

This principle describes a separate cause: Node labels are discoverable metadata matched by selectors; a node label alone does not create a workload restriction. The reported condition is governed by: Uncordon clears the Node's unschedulable status; it does not guarantee any particular Pod will be placed there. The two mechanisms should not be conflated.

D:

A namespaced Role expresses allowed resource verbs; it has no effect until a RoleBinding associates a subject. That explanation applies to a different technical failure. Here the controlling principle is: Uncordon clears the Node's unschedulable status; it does not guarantee any particular Pod will be placed there.

Question 163

At Horizon observability, in a disposable simulated environment during a monitored release window: Node worker-b has passed maintenance checks and must accept normal new workloads again. Work only within the stated target and verify before declaring success. Which observation best verifies the requested outcome rather than an unrelated state?

  1. Run kubectl get clusterrole metrics-api-node-reader -o yaml and inspect resources and verbs.
  2. Run kubectl get namespace observability --show-labels and confirm the namespace and owner label exist.
  3. Run kubectl get node worker-b and verify that SchedulingDisabled is absent.
  4. Run kubectl get nodes from the control plane and confirm worker-b becomes Ready after CNI initialization.

Explanation

Correct Answer

C:

Run kubectl get node worker-b and verify that SchedulingDisabled is absent. This validates the affected object or control path, rather than only showing a command completed. The underlying reason is: Uncordon clears the Node's unschedulable status; it does not guarantee any particular Pod will be placed there. The intended action is: Run kubectl uncordon worker-b.

Incorrect Answers

A:

That test belongs to another control with this basis: Nodes are cluster-scoped and their access rules belong in a ClusterRole rather than a namespaced Role. In the current case, the governing reason is: Uncordon clears the Node's unschedulable status; it does not guarantee any particular Pod will be placed there. The direct verification is “Run kubectl get node worker-b and verify that SchedulingDisabled is absent”.

B:

This observation would test a different technical dependency: A Namespace supplies a scope for namespaced resources while its metadata labels support policy and inventory selectors. The current issue is governed by: Uncordon clears the Node's unschedulable status; it does not guarantee any particular Pod will be placed there. Its decisive check is “Run kubectl get node worker-b and verify that SchedulingDisabled is absent”.

D:

That test belongs to another control with this basis: A worker joins through trusted control-plane discovery and TLS bootstrap; a random API endpoint or mismatched CA hash is unsafe. In the current case, the governing reason is: Uncordon clears the Node's unschedulable status; it does not guarantee any particular Pod will be placed there. The direct verification is “Run kubectl get node worker-b and verify that SchedulingDisabled is absent”.

Question 164

At Horizon observability, in a disposable simulated environment during a monitored release window: Node worker-b has passed maintenance checks and must accept normal new workloads again. Work only within the stated target and verify before declaring success. Which operational control most directly prevents this failure or configuration drift?

  1. Review namespace quota headroom after material changes in workload size or tenancy.
  2. Reserve and govern security-sensitive scheduling labels through controlled change procedures.
  3. Use narrowly defined ClusterRoles and periodically audit cluster-wide grants.
  4. Include schedulability restoration in maintenance completion checklists.

Explanation

Correct Answer

D:

Include schedulability restoration in maintenance completion checklists. This reduces recurrence of the specific operational failure. It reinforces the action: Run kubectl uncordon worker-b. The relevant mechanism is: Uncordon clears the Node's unschedulable status; it does not guarantee any particular Pod will be placed there.

Incorrect Answers

A:

This routine guards against another mechanism: A ResourceQuota caps combined admitted requests in a namespace; per-Pod limits alone do not enforce a namespace-wide budget. The recurring exposure in the current case is: Uncordon clears the Node's unschedulable status; it does not guarantee any particular Pod will be placed there. The matching preventive check is “Include schedulability restoration in maintenance completion checklists”.

B:

The suggested review tracks a different technical risk: Node labels are discoverable metadata matched by selectors; a node label alone does not create a workload restriction. Here the sustained control must address: Uncordon clears the Node's unschedulable status; it does not guarantee any particular Pod will be placed there. Choose “Include schedulability restoration in maintenance completion checklists”.

C:

That safeguard is relevant to: Nodes are cluster-scoped and their access rules belong in a ClusterRole rather than a namespaced Role. The current failure instead follows from: Uncordon clears the Node's unschedulable status; it does not guarantee any particular Pod will be placed there. Its prevention measure is “Include schedulability restoration in maintenance completion checklists”.

Question 165

At Pinecrest logistics, in a sandbox Kubernetes cluster during a recovery tabletop exercise: Node worker-c has passed maintenance checks and must accept normal new workloads again. Work only within the stated target and verify before declaring success. Which command or initial safe diagnostic step best addresses the stated lab task?

  1. Run kubectl create clusterrole dispatch-api-node-reader --verb=get,list --resource=nodes.
  2. Run kubectl uncordon worker-c.
  3. Run kubectl label node worker-a workload=restricted --overwrite.
  4. Run kubectl create namespace fulfillment and then kubectl label namespace fulfillment owner=supply --overwrite.

Explanation

Correct Answer

B:

Run kubectl uncordon worker-c. This is the appropriate command-line action or first safe diagnostic. The technical reason is: Uncordon clears the Node's unschedulable status; it does not guarantee any particular Pod will be placed there. Validate the result with: Run kubectl get node worker-c and verify that SchedulingDisabled is absent. Execute changes only in an authorized disposable lab or after normal production change controls.

Incorrect Answers

A:

The proposed action belongs to the mechanism: Nodes are cluster-scoped and their access rules belong in a ClusterRole rather than a namespaced Role. Here the stated fault follows a different mechanism: Uncordon clears the Node's unschedulable status; it does not guarantee any particular Pod will be placed there. The corrective choice is “Run kubectl uncordon worker-c”.

C:

This alternative is a response to another technical cause: Node labels are discoverable metadata matched by selectors; a node label alone does not create a workload restriction. The reported case instead depends on: Uncordon clears the Node's unschedulable status; it does not guarantee any particular Pod will be placed there. The action that directly addresses it is “Run kubectl uncordon worker-c”.

D:

The proposed action belongs to the mechanism: A Namespace supplies a scope for namespaced resources while its metadata labels support policy and inventory selectors. Here the stated fault follows a different mechanism: Uncordon clears the Node's unschedulable status; it does not guarantee any particular Pod will be placed there. The corrective choice is “Run kubectl uncordon worker-c”.

Question 166

At Pinecrest logistics, in a sandbox Kubernetes cluster during a recovery tabletop exercise: Node worker-c has passed maintenance checks and must accept normal new workloads again. Work only within the stated target and verify before declaring success. Which Kubernetes behavior best explains the required change or diagnosis?

  1. Drain cordons the node and requests evictions for eligible Pods; the ignore-daemonsets flag is needed because DaemonSet Pods are not deleted by drain.
  2. A trailing minus removes the matching taint; adding a new toleration on every Pod would leave unnecessary cluster constraints.
  3. Uncordon clears the Node's unschedulable status; it does not guarantee any particular Pod will be placed there.
  4. A worker joins through trusted control-plane discovery and TLS bootstrap; a random API endpoint or mismatched CA hash is unsafe.

Explanation

Correct Answer

C:

Uncordon clears the Node's unschedulable status; it does not guarantee any particular Pod will be placed there. This explains the stated condition. The corresponding action is: Run kubectl uncordon worker-c. The direct acceptance evidence is: Run kubectl get node worker-c and verify that SchedulingDisabled is absent.

Incorrect Answers

A:

The offered statement is true for this other mechanism: Drain cordons the node and requests evictions for eligible Pods; the ignore-daemonsets flag is needed because DaemonSet Pods are not deleted by drain. It does not explain the facts described here, which follow from: Uncordon clears the Node's unschedulable status; it does not guarantee any particular Pod will be placed there.

B:

This principle describes a separate cause: A trailing minus removes the matching taint; adding a new toleration on every Pod would leave unnecessary cluster constraints. The reported condition is governed by: Uncordon clears the Node's unschedulable status; it does not guarantee any particular Pod will be placed there. The two mechanisms should not be conflated.

D:

The offered statement is true for this other mechanism: A worker joins through trusted control-plane discovery and TLS bootstrap; a random API endpoint or mismatched CA hash is unsafe. It does not explain the facts described here, which follow from: Uncordon clears the Node's unschedulable status; it does not guarantee any particular Pod will be placed there.

Question 167

At Pinecrest logistics, in a sandbox Kubernetes cluster during a recovery tabletop exercise: Node worker-c has passed maintenance checks and must accept normal new workloads again. Work only within the stated target and verify before declaring success. Which observation best verifies the requested outcome rather than an unrelated state?

  1. Run kubectl -n fulfillment get serviceaccount sync-bot and inspect the Deployment's serviceAccountName after binding it.
  2. Run kubectl get node worker-b --show-labels and inspect workloads' node selectors.
  3. Run kubectl describe node worker-c and inspect the Taints field for the intended key, value and effect.
  4. Run kubectl get node worker-c and verify that SchedulingDisabled is absent.

Explanation

Correct Answer

D:

Run kubectl get node worker-c and verify that SchedulingDisabled is absent. This validates the affected object or control path, rather than only showing a command completed. The underlying reason is: Uncordon clears the Node's unschedulable status; it does not guarantee any particular Pod will be placed there. The intended action is: Run kubectl uncordon worker-c.

Incorrect Answers

A:

This observation would test a different technical dependency: ServiceAccounts provide workload identity; creating one does not automatically grant extra RBAC permissions. The current issue is governed by: Uncordon clears the Node's unschedulable status; it does not guarantee any particular Pod will be placed there. Its decisive check is “Run kubectl get node worker-c and verify that SchedulingDisabled is absent”.

B:

The alternative verifies a different condition: Node labels are discoverable metadata matched by selectors; a node label alone does not create a workload restriction. The current case instead depends on: Uncordon clears the Node's unschedulable status; it does not guarantee any particular Pod will be placed there. Confirm that “Run kubectl get node worker-c and verify that SchedulingDisabled is absent”.

C:

That test belongs to another control with this basis: A NoSchedule taint repels Pods without a matching toleration but does not automatically evict already running Pods. In the current case, the governing reason is: Uncordon clears the Node's unschedulable status; it does not guarantee any particular Pod will be placed there. The direct verification is “Run kubectl get node worker-c and verify that SchedulingDisabled is absent”.

Question 168

At Pinecrest logistics, in a sandbox Kubernetes cluster during a recovery tabletop exercise: Node worker-c has passed maintenance checks and must accept normal new workloads again. Work only within the stated target and verify before declaring success. Which operational control most directly prevents this failure or configuration drift?

  1. Include schedulability restoration in maintenance completion checklists.
  2. Reconcile taints with workload tolerations and document dedicated-node policies.
  3. Review namespace quota headroom after material changes in workload size or tenancy.
  4. Review service-account subjects when workloads or bindings are renamed.

Explanation

Correct Answer

A:

Include schedulability restoration in maintenance completion checklists. This reduces recurrence of the specific operational failure. It reinforces the action: Run kubectl uncordon worker-c. The relevant mechanism is: Uncordon clears the Node's unschedulable status; it does not guarantee any particular Pod will be placed there.

Incorrect Answers

B:

That safeguard is relevant to: A NoSchedule taint repels Pods without a matching toleration but does not automatically evict already running Pods. The current failure instead follows from: Uncordon clears the Node's unschedulable status; it does not guarantee any particular Pod will be placed there. Its prevention measure is “Include schedulability restoration in maintenance completion checklists”.

C:

This routine guards against another mechanism: A ResourceQuota caps combined admitted requests in a namespace; per-Pod limits alone do not enforce a namespace-wide budget. The recurring exposure in the current case is: Uncordon clears the Node's unschedulable status; it does not guarantee any particular Pod will be placed there. The matching preventive check is “Include schedulability restoration in maintenance completion checklists”.

D:

The suggested review tracks a different technical risk: A RoleBinding associates the service account subject with a Role inside the binding namespace. Here the sustained control must address: Uncordon clears the Node's unschedulable status; it does not guarantee any particular Pod will be placed there. Choose “Include schedulability restoration in maintenance completion checklists”.

Question 169

At Northstar finance, in an isolated training cluster during a scheduled maintenance rehearsal: The kubeadm control plane on worker-a is due for a supported Kubernetes version review before a maintenance upgrade. Work only within the stated target and verify before declaring success. Which command or initial safe diagnostic step best addresses the stated lab task?

  1. Run kubectl taint nodes worker-a special=dedicated:NoSchedule after confirming it is absent.
  2. On the control-plane host with the matching kubeadm package, run sudo kubeadm upgrade apply v1.35.3 after backups and component compatibility checks.
  3. Run sudo kubeadm upgrade plan on the eligible control-plane host after checking package and version prerequisites.
  4. Run sudo kubeadm token create --ttl 15m --print-join-command on an authorized control-plane host and keep the output confidential.

Explanation

Correct Answer

C:

Run sudo kubeadm upgrade plan on the eligible control-plane host after checking package and version prerequisites. This is the appropriate command-line action or first safe diagnostic. The technical reason is: Upgrade plan reports reachable upgrade targets and version skew considerations without applying a new control-plane version. Validate the result with: Inspect the reported current and candidate versions, component compatibility and upgrade preflight warnings. Execute changes only in an authorized disposable lab or after normal production change controls.

Incorrect Answers

A:

The offered action targets: A NoSchedule taint repels Pods without a matching toleration but does not automatically evict already running Pods. The case facts point instead to: Upgrade plan reports reachable upgrade targets and version skew considerations without applying a new control-plane version. Implement “Run sudo kubeadm upgrade plan on the eligible control-plane host after checking package and version prerequisites” to address that specific condition.

B:

This alternative is a response to another technical cause: Kubeadm upgrade apply updates the managed control-plane configuration; kubelet packages and other nodes require separate coordinated work. The reported case instead depends on: Upgrade plan reports reachable upgrade targets and version skew considerations without applying a new control-plane version. The action that directly addresses it is “Run sudo kubeadm upgrade plan on the eligible control-plane host after checking package and version prerequisites”.

D:

The offered action targets: Bootstrap join tokens are sensitive credentials and a short TTL reduces the period in which a leaked token could be abused. The case facts point instead to: Upgrade plan reports reachable upgrade targets and version skew considerations without applying a new control-plane version. Implement “Run sudo kubeadm upgrade plan on the eligible control-plane host after checking package and version prerequisites” to address that specific condition.

Question 170

At Northstar finance, in an isolated training cluster during a scheduled maintenance rehearsal: The kubeadm control plane on worker-a is due for a supported Kubernetes version review before a maintenance upgrade. Work only within the stated target and verify before declaring success. Which Kubernetes behavior best explains the required change or diagnosis?

  1. Bootstrap join tokens are sensitive credentials and a short TTL reduces the period in which a leaked token could be abused.
  2. Node labels are discoverable metadata matched by selectors; a node label alone does not create a workload restriction.
  3. A worker joins through trusted control-plane discovery and TLS bootstrap; a random API endpoint or mismatched CA hash is unsafe.
  4. Upgrade plan reports reachable upgrade targets and version skew considerations without applying a new control-plane version.

Explanation

Correct Answer

D:

Upgrade plan reports reachable upgrade targets and version skew considerations without applying a new control-plane version. This explains the stated condition. The corresponding action is: Run sudo kubeadm upgrade plan on the eligible control-plane host after checking package and version prerequisites. The direct acceptance evidence is: Inspect the reported current and candidate versions, component compatibility and upgrade preflight warnings.

Incorrect Answers

A:

This principle describes a separate cause: Bootstrap join tokens are sensitive credentials and a short TTL reduces the period in which a leaked token could be abused. The reported condition is governed by: Upgrade plan reports reachable upgrade targets and version skew considerations without applying a new control-plane version. The two mechanisms should not be conflated.

B:

Node labels are discoverable metadata matched by selectors; a node label alone does not create a workload restriction. That explanation applies to a different technical failure. Here the controlling principle is: Upgrade plan reports reachable upgrade targets and version skew considerations without applying a new control-plane version.

C:

The offered statement is true for this other mechanism: A worker joins through trusted control-plane discovery and TLS bootstrap; a random API endpoint or mismatched CA hash is unsafe. It does not explain the facts described here, which follow from: Upgrade plan reports reachable upgrade targets and version skew considerations without applying a new control-plane version.