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CNCF CKA Practice Test 104

Question 1030

At Pinecrest logistics, in a sandbox Kubernetes cluster during a recovery tabletop exercise: Clients can resolve Service dispatch-svc in fulfillment but connections fail; Service targetPort does not match the container's actual listener 9000. Work only within the stated target and verify before declaring success. Which Kubernetes behavior best explains the required change or diagnosis?

  1. A hard nodeSelector must match a Node's actual labels; tolerations or Service routing cannot bypass the unmatched selector.
  2. A Service may exist without usable backends because labels or Pod readiness do not match expected routing.
  3. The Service routes to its configured backend target port; working DNS does not establish that the destination process is listening there.
  4. A running container is not necessarily Ready; failing readiness can remove a Pod from ready Service endpoints.

Explanation

Correct Answer

C:

The Service routes to its configured backend target port; working DNS does not establish that the destination process is listening there. This explains the stated condition. The corresponding action is: Run kubectl -n fulfillment describe service dispatch-svc and compare Service targetPort with Pod listening port before patching. The direct acceptance evidence is: Run an in-cluster connection test to Service port 9090 after aligning targetPort with 9000.

Incorrect Answers

A:

The offered statement is true for this other mechanism: A hard nodeSelector must match a Node's actual labels; tolerations or Service routing cannot bypass the unmatched selector. It does not explain the facts described here, which follow from: The Service routes to its configured backend target port; working DNS does not establish that the destination process is listening there.

B:

This principle describes a separate cause: A Service may exist without usable backends because labels or Pod readiness do not match expected routing. The reported condition is governed by: The Service routes to its configured backend target port; working DNS does not establish that the destination process is listening there. The two mechanisms should not be conflated.

D:

The offered statement is true for this other mechanism: A running container is not necessarily Ready; failing readiness can remove a Pod from ready Service endpoints. It does not explain the facts described here, which follow from: The Service routes to its configured backend target port; working DNS does not establish that the destination process is listening there.

Question 1031

At Pinecrest logistics, in a sandbox Kubernetes cluster during a recovery tabletop exercise: Clients can resolve Service dispatch-svc in fulfillment but connections fail; Service targetPort does not match the container's actual listener 9000. Work only within the stated target and verify before declaring success. Which observation best verifies the requested outcome rather than an unrelated state?

  1. Verify the replacement Deployment has matching immutable selector and template labels plus desired available replicas.
  2. Run kubectl -n fulfillment get pod dispatch-api -o wide after an approved matching label or selector correction and confirm a suitable node.
  3. Verify the exact toleration or deliberate taint removal and confirm that the Pod schedules to an eligible node.
  4. Run an in-cluster connection test to Service port 9090 after aligning targetPort with 9000.

Explanation

Correct Answer

D:

Run an in-cluster connection test to Service port 9090 after aligning targetPort with 9000. This validates the affected object or control path, rather than only showing a command completed. The underlying reason is: The Service routes to its configured backend target port; working DNS does not establish that the destination process is listening there. The intended action is: Run kubectl -n fulfillment describe service dispatch-svc and compare Service targetPort with Pod listening port before patching.

Incorrect Answers

A:

This observation would test a different technical dependency: A Deployment selector identifies Pods it owns and is generally immutable after creation; patching Service selectors alone does not repair ownership. The current issue is governed by: The Service routes to its configured backend target port; working DNS does not establish that the destination process is listening there. Its decisive check is “Run an in-cluster connection test to Service port 9090 after aligning targetPort with 9000”.

B:

The alternative verifies a different condition: A hard nodeSelector must match a Node's actual labels; tolerations or Service routing cannot bypass the unmatched selector. The current case instead depends on: The Service routes to its configured backend target port; working DNS does not establish that the destination process is listening there. Confirm that “Run an in-cluster connection test to Service port 9090 after aligning targetPort with 9000”.

C:

That test belongs to another control with this basis: A NoSchedule taint excludes Pods lacking a matching toleration even if the Node has free resources. In the current case, the governing reason is: The Service routes to its configured backend target port; working DNS does not establish that the destination process is listening there. The direct verification is “Run an in-cluster connection test to Service port 9090 after aligning targetPort with 9000”.

Question 1032

At Pinecrest logistics, in a sandbox Kubernetes cluster during a recovery tabletop exercise: Clients can resolve Service dispatch-svc in fulfillment but connections fail; Service targetPort does not match the container's actual listener 9000. Work only within the stated target and verify before declaring success. Which operational control most directly prevents this failure or configuration drift?

  1. Maintain port contracts across workload, Service and probe configuration changes.
  2. Add labels, readiness and EndpointSlice checks to Service deployment acceptance tests.
  3. Test DNS policy and search domains during application Pod template changes.
  4. Choose realistic initial delays or startup probes based on measured application start behavior.

Explanation

Correct Answer

A:

Maintain port contracts across workload, Service and probe configuration changes. This reduces recurrence of the specific operational failure. It reinforces the action: Run kubectl -n fulfillment describe service dispatch-svc and compare Service targetPort with Pod listening port before patching. The relevant mechanism is: The Service routes to its configured backend target port; working DNS does not establish that the destination process is listening there.

Incorrect Answers

B:

That safeguard is relevant to: A Service may exist without usable backends because labels or Pod readiness do not match expected routing. The current failure instead follows from: The Service routes to its configured backend target port; working DNS does not establish that the destination process is listening there. Its prevention measure is “Maintain port contracts across workload, Service and probe configuration changes”.

C:

This routine guards against another mechanism: Cluster DNS search domains and dnsPolicy control short-name resolution; resolving a public hostname is not proof of Kubernetes Service resolution. The recurring exposure in the current case is: The Service routes to its configured backend target port; working DNS does not establish that the destination process is listening there. The matching preventive check is “Maintain port contracts across workload, Service and probe configuration changes”.

D:

The suggested review tracks a different technical risk: Liveness failure triggers restarts, while startup and readiness probes serve different lifecycle purposes. Here the sustained control must address: The Service routes to its configured backend target port; working DNS does not establish that the destination process is listening there. Choose “Maintain port contracts across workload, Service and probe configuration changes”.

Question 1033

At Northstar finance, in an isolated training cluster during a scheduled maintenance rehearsal: Pod invoice-api in namespace ledger resolves external names but cannot resolve local Service invoice-svc; check Pod DNS policy and Service FQDN. 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 -n ledger describe pod invoice-api and inspect readiness failure events and probe configuration.
  2. Run kubectl -n ledger describe service invoice-svc and compare Service targetPort with Pod listening port before patching.
  3. Run kubectl -n ledger exec invoice-api -- cat /etc/resolv.conf and query invoice-svc.ledger.svc.cluster.local from that Pod.
  4. Run kubectl -n observability describe service metrics-svc and compare Service targetPort with Pod listening port before patching.

Explanation

Correct Answer

C:

Run kubectl -n ledger exec invoice-api -- cat /etc/resolv.conf and query invoice-svc.ledger.svc.cluster.local from that Pod. This is the appropriate command-line action or first safe diagnostic. The technical reason is: Cluster DNS search domains and dnsPolicy control short-name resolution; resolving a public hostname is not proof of Kubernetes Service resolution. Validate the result with: Verify both the full Service name and intended short name resolve after DNS configuration correction. Execute changes only in an authorized disposable lab or after normal production change controls.

Incorrect Answers

A:

The offered action targets: A running container is not necessarily Ready; failing readiness can remove a Pod from ready Service endpoints. The case facts point instead to: Cluster DNS search domains and dnsPolicy control short-name resolution; resolving a public hostname is not proof of Kubernetes Service resolution. Implement “Run kubectl -n ledger exec invoice-api -- cat /etc/resolv.conf and query invoice-svc.ledger.svc.cluster.local from that Pod” to address that specific condition.

B:

This alternative is a response to another technical cause: The Service routes to its configured backend target port; working DNS does not establish that the destination process is listening there. The reported case instead depends on: Cluster DNS search domains and dnsPolicy control short-name resolution; resolving a public hostname is not proof of Kubernetes Service resolution. The action that directly addresses it is “Run kubectl -n ledger exec invoice-api -- cat /etc/resolv.conf and query invoice-svc.ledger.svc.cluster.local from that Pod”.

D:

The offered action targets: The Service routes to its configured backend target port; working DNS does not establish that the destination process is listening there. The case facts point instead to: Cluster DNS search domains and dnsPolicy control short-name resolution; resolving a public hostname is not proof of Kubernetes Service resolution. Implement “Run kubectl -n ledger exec invoice-api -- cat /etc/resolv.conf and query invoice-svc.ledger.svc.cluster.local from that Pod” to address that specific condition.

Question 1034

At Northstar finance, in an isolated training cluster during a scheduled maintenance rehearsal: Pod invoice-api in namespace ledger resolves external names but cannot resolve local Service invoice-svc; check Pod DNS policy and Service FQDN. Work only within the stated target and verify before declaring success. Which Kubernetes behavior best explains the required change or diagnosis?

  1. ImagePullBackOff indicates failed image retrieval; cluster DNS, credentials, registry availability and image names are distinct potential causes.
  2. HPA CPU utilization is computed from reported metrics relative to requests; missing metrics or requests can prevent scaling decisions.
  3. A NoSchedule taint excludes Pods lacking a matching toleration even if the Node has free resources.
  4. Cluster DNS search domains and dnsPolicy control short-name resolution; resolving a public hostname is not proof of Kubernetes Service resolution.

Explanation

Correct Answer

D:

Cluster DNS search domains and dnsPolicy control short-name resolution; resolving a public hostname is not proof of Kubernetes Service resolution. This explains the stated condition. The corresponding action is: Run kubectl -n ledger exec invoice-api -- cat /etc/resolv.conf and query invoice-svc.ledger.svc.cluster.local from that Pod. The direct acceptance evidence is: Verify both the full Service name and intended short name resolve after DNS configuration correction.

Incorrect Answers

A:

This principle describes a separate cause: ImagePullBackOff indicates failed image retrieval; cluster DNS, credentials, registry availability and image names are distinct potential causes. The reported condition is governed by: Cluster DNS search domains and dnsPolicy control short-name resolution; resolving a public hostname is not proof of Kubernetes Service resolution. The two mechanisms should not be conflated.

B:

HPA CPU utilization is computed from reported metrics relative to requests; missing metrics or requests can prevent scaling decisions. That explanation applies to a different technical failure. Here the controlling principle is: Cluster DNS search domains and dnsPolicy control short-name resolution; resolving a public hostname is not proof of Kubernetes Service resolution.

C:

The offered statement is true for this other mechanism: A NoSchedule taint excludes Pods lacking a matching toleration even if the Node has free resources. It does not explain the facts described here, which follow from: Cluster DNS search domains and dnsPolicy control short-name resolution; resolving a public hostname is not proof of Kubernetes Service resolution.

Question 1035

At Northstar finance, in an isolated training cluster during a scheduled maintenance rehearsal: Pod invoice-api in namespace ledger resolves external names but cannot resolve local Service invoice-svc; check Pod DNS policy and Service FQDN. Work only within the stated target and verify before declaring success. Which observation best verifies the requested outcome rather than an unrelated state?

  1. Verify both the full Service name and intended short name resolve after DNS configuration correction.
  2. Run an in-cluster connection test to Service port 80 after aligning targetPort with 8080.
  3. Run authorized allowed and denied connectivity probes after creating the precise required policy exception.
  4. Confirm CoreDNS replicas are Ready and a test Pod can resolve a known Service in ledger.

Explanation

Correct Answer

A:

Verify both the full Service name and intended short name resolve after DNS configuration correction. This validates the affected object or control path, rather than only showing a command completed. The underlying reason is: Cluster DNS search domains and dnsPolicy control short-name resolution; resolving a public hostname is not proof of Kubernetes Service resolution. The intended action is: Run kubectl -n ledger exec invoice-api -- cat /etc/resolv.conf and query invoice-svc.ledger.svc.cluster.local from that Pod.

Incorrect Answers

B:

That test belongs to another control with this basis: The Service routes to its configured backend target port; working DNS does not establish that the destination process is listening there. In the current case, the governing reason is: Cluster DNS search domains and dnsPolicy control short-name resolution; resolving a public hostname is not proof of Kubernetes Service resolution. The direct verification is “Verify both the full Service name and intended short name resolve after DNS configuration correction”.

C:

This observation would test a different technical dependency: NetworkPolicy allows only explicitly selected paths once Pod ingress or egress isolation applies, and both directions may matter. The current issue is governed by: Cluster DNS search domains and dnsPolicy control short-name resolution; resolving a public hostname is not proof of Kubernetes Service resolution. Its decisive check is “Verify both the full Service name and intended short name resolve after DNS configuration correction”.

D:

The alternative verifies a different condition: A cluster-wide DNS component failure affects names across workloads and cannot be resolved by changing one Service selector. The current case instead depends on: Cluster DNS search domains and dnsPolicy control short-name resolution; resolving a public hostname is not proof of Kubernetes Service resolution. Confirm that “Verify both the full Service name and intended short name resolve after DNS configuration correction”.

Question 1036

At Northstar finance, in an isolated training cluster during a scheduled maintenance rehearsal: Pod invoice-api in namespace ledger resolves external names but cannot resolve local Service invoice-svc; check Pod DNS policy and Service FQDN. Work only within the stated target and verify before declaring success. Which operational control most directly prevents this failure or configuration drift?

  1. Maintain an inventory of dedicated-node taints and explicitly reviewed workload tolerations.
  2. Test DNS policy and search domains during application Pod template changes.
  3. Validate DaemonSet coverage whenever node labels, pools or taints change.
  4. Govern scheduler labels and include eligible-node checks before promoting hard node selectors.

Explanation

Correct Answer

B:

Test DNS policy and search domains during application Pod template changes. This reduces recurrence of the specific operational failure. It reinforces the action: Run kubectl -n ledger exec invoice-api -- cat /etc/resolv.conf and query invoice-svc.ledger.svc.cluster.local from that Pod. The relevant mechanism is: Cluster DNS search domains and dnsPolicy control short-name resolution; resolving a public hostname is not proof of Kubernetes Service resolution.

Incorrect Answers

A:

That safeguard is relevant to: A NoSchedule taint excludes Pods lacking a matching toleration even if the Node has free resources. The current failure instead follows from: Cluster DNS search domains and dnsPolicy control short-name resolution; resolving a public hostname is not proof of Kubernetes Service resolution. Its prevention measure is “Test DNS policy and search domains during application Pod template changes”.

C:

The suggested review tracks a different technical risk: DaemonSets schedule according to node selection and toleration rules; unavailable node agents can break networking or logging on selected workers. Here the sustained control must address: Cluster DNS search domains and dnsPolicy control short-name resolution; resolving a public hostname is not proof of Kubernetes Service resolution. Choose “Test DNS policy and search domains during application Pod template changes”.

D:

That safeguard is relevant to: A hard nodeSelector must match a Node's actual labels; tolerations or Service routing cannot bypass the unmatched selector. The current failure instead follows from: Cluster DNS search domains and dnsPolicy control short-name resolution; resolving a public hostname is not proof of Kubernetes Service resolution. Its prevention measure is “Test DNS policy and search domains during application Pod template changes”.

Question 1037

At Horizon observability, in a disposable simulated environment during a monitored release window: Pod metrics-api in namespace observability resolves external names but cannot resolve local Service metrics-svc; check Pod DNS policy and Service FQDN. 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 -n observability describe hpa metrics-api and check the metrics API, CPU requests and target Pod selection.
  2. Run kubectl -n observability get deployment metrics-api -o yaml and inspect immutable selector and Pod-template labels before planning controlled replacement.
  3. Run kubectl get nodes -l workload=restricted and compare with kubectl -n observability describe pod metrics-api before changing node labels.
  4. Run kubectl -n observability exec metrics-api -- cat /etc/resolv.conf and query metrics-svc.observability.svc.cluster.local from that Pod.

Explanation

Correct Answer

D:

Run kubectl -n observability exec metrics-api -- cat /etc/resolv.conf and query metrics-svc.observability.svc.cluster.local from that Pod. This is the appropriate command-line action or first safe diagnostic. The technical reason is: Cluster DNS search domains and dnsPolicy control short-name resolution; resolving a public hostname is not proof of Kubernetes Service resolution. Validate the result with: Verify both the full Service name and intended short name resolve after DNS configuration correction. Execute changes only in an authorized disposable lab or after normal production change controls.

Incorrect Answers

A:

This alternative is a response to another technical cause: HPA CPU utilization is computed from reported metrics relative to requests; missing metrics or requests can prevent scaling decisions. The reported case instead depends on: Cluster DNS search domains and dnsPolicy control short-name resolution; resolving a public hostname is not proof of Kubernetes Service resolution. The action that directly addresses it is “Run kubectl -n observability exec metrics-api -- cat /etc/resolv.conf and query metrics-svc.observability.svc.cluster.local from that Pod”.

B:

The proposed action belongs to the mechanism: A Deployment selector identifies Pods it owns and is generally immutable after creation; patching Service selectors alone does not repair ownership. Here the stated fault follows a different mechanism: Cluster DNS search domains and dnsPolicy control short-name resolution; resolving a public hostname is not proof of Kubernetes Service resolution. The corrective choice is “Run kubectl -n observability exec metrics-api -- cat /etc/resolv.conf and query metrics-svc.observability.svc.cluster.local from that Pod”.

C:

The offered action targets: A hard nodeSelector must match a Node's actual labels; tolerations or Service routing cannot bypass the unmatched selector. The case facts point instead to: Cluster DNS search domains and dnsPolicy control short-name resolution; resolving a public hostname is not proof of Kubernetes Service resolution. Implement “Run kubectl -n observability exec metrics-api -- cat /etc/resolv.conf and query metrics-svc.observability.svc.cluster.local from that Pod” to address that specific condition.

Question 1038

At Horizon observability, in a disposable simulated environment during a monitored release window: Pod metrics-api in namespace observability resolves external names but cannot resolve local Service metrics-svc; check Pod DNS policy and Service FQDN. Work only within the stated target and verify before declaring success. Which Kubernetes behavior best explains the required change or diagnosis?

  1. Cluster DNS search domains and dnsPolicy control short-name resolution; resolving a public hostname is not proof of Kubernetes Service resolution.
  2. NetworkPolicy allows only explicitly selected paths once Pod ingress or egress isolation applies, and both directions may matter.
  3. A Deployment selector identifies Pods it owns and is generally immutable after creation; patching Service selectors alone does not repair ownership.
  4. A Service may exist without usable backends because labels or Pod readiness do not match expected routing.

Explanation

Correct Answer

A:

Cluster DNS search domains and dnsPolicy control short-name resolution; resolving a public hostname is not proof of Kubernetes Service resolution. This explains the stated condition. The corresponding action is: Run kubectl -n observability exec metrics-api -- cat /etc/resolv.conf and query metrics-svc.observability.svc.cluster.local from that Pod. The direct acceptance evidence is: Verify both the full Service name and intended short name resolve after DNS configuration correction.

Incorrect Answers

B:

The offered statement is true for this other mechanism: NetworkPolicy allows only explicitly selected paths once Pod ingress or egress isolation applies, and both directions may matter. It does not explain the facts described here, which follow from: Cluster DNS search domains and dnsPolicy control short-name resolution; resolving a public hostname is not proof of Kubernetes Service resolution.

C:

This principle describes a separate cause: A Deployment selector identifies Pods it owns and is generally immutable after creation; patching Service selectors alone does not repair ownership. The reported condition is governed by: Cluster DNS search domains and dnsPolicy control short-name resolution; resolving a public hostname is not proof of Kubernetes Service resolution. The two mechanisms should not be conflated.

D:

A Service may exist without usable backends because labels or Pod readiness do not match expected routing. That explanation applies to a different technical failure. Here the controlling principle is: Cluster DNS search domains and dnsPolicy control short-name resolution; resolving a public hostname is not proof of Kubernetes Service resolution.

Question 1039

At Horizon observability, in a disposable simulated environment during a monitored release window: Pod metrics-api in namespace observability resolves external names but cannot resolve local Service metrics-svc; check Pod DNS policy and Service FQDN. 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 an in-cluster connection test to Service port 80 after aligning targetPort with 8080.
  2. Verify both the full Service name and intended short name resolve after DNS configuration correction.
  3. Run authorized allowed and denied connectivity probes after creating the precise required policy exception.
  4. Run kubectl -n observability get daemonset metrics-api and inspect desired/ready counts after the specific node issue is fixed.

Explanation

Correct Answer

B:

Verify both the full Service name and intended short name resolve after DNS configuration correction. This validates the affected object or control path, rather than only showing a command completed. The underlying reason is: Cluster DNS search domains and dnsPolicy control short-name resolution; resolving a public hostname is not proof of Kubernetes Service resolution. The intended action is: Run kubectl -n observability exec metrics-api -- cat /etc/resolv.conf and query metrics-svc.observability.svc.cluster.local from that Pod.

Incorrect Answers

A:

That test belongs to another control with this basis: The Service routes to its configured backend target port; working DNS does not establish that the destination process is listening there. In the current case, the governing reason is: Cluster DNS search domains and dnsPolicy control short-name resolution; resolving a public hostname is not proof of Kubernetes Service resolution. The direct verification is “Verify both the full Service name and intended short name resolve after DNS configuration correction”.

C:

The alternative verifies a different condition: NetworkPolicy allows only explicitly selected paths once Pod ingress or egress isolation applies, and both directions may matter. The current case instead depends on: Cluster DNS search domains and dnsPolicy control short-name resolution; resolving a public hostname is not proof of Kubernetes Service resolution. Confirm that “Verify both the full Service name and intended short name resolve after DNS configuration correction”.

D:

That test belongs to another control with this basis: DaemonSets schedule according to node selection and toleration rules; unavailable node agents can break networking or logging on selected workers. In the current case, the governing reason is: Cluster DNS search domains and dnsPolicy control short-name resolution; resolving a public hostname is not proof of Kubernetes Service resolution. The direct verification is “Verify both the full Service name and intended short name resolve after DNS configuration correction”.

Question 1040

At Horizon observability, in a disposable simulated environment during a monitored release window: Pod metrics-api in namespace observability resolves external names but cannot resolve local Service metrics-svc; check Pod DNS policy and Service FQDN. Work only within the stated target and verify before declaring success. Which operational control most directly prevents this failure or configuration drift?

  1. Maintain port contracts across workload, Service and probe configuration changes.
  2. Validate DaemonSet coverage whenever node labels, pools or taints change.
  3. Test DNS policy and search domains during application Pod template changes.
  4. Validate selector and template-label consistency before initial resource creation.

Explanation

Correct Answer

C:

Test DNS policy and search domains during application Pod template changes. This reduces recurrence of the specific operational failure. It reinforces the action: Run kubectl -n observability exec metrics-api -- cat /etc/resolv.conf and query metrics-svc.observability.svc.cluster.local from that Pod. The relevant mechanism is: Cluster DNS search domains and dnsPolicy control short-name resolution; resolving a public hostname is not proof of Kubernetes Service resolution.

Incorrect Answers

A:

This routine guards against another mechanism: The Service routes to its configured backend target port; working DNS does not establish that the destination process is listening there. The recurring exposure in the current case is: Cluster DNS search domains and dnsPolicy control short-name resolution; resolving a public hostname is not proof of Kubernetes Service resolution. The matching preventive check is “Test DNS policy and search domains during application Pod template changes”.

B:

The suggested review tracks a different technical risk: DaemonSets schedule according to node selection and toleration rules; unavailable node agents can break networking or logging on selected workers. Here the sustained control must address: Cluster DNS search domains and dnsPolicy control short-name resolution; resolving a public hostname is not proof of Kubernetes Service resolution. Choose “Test DNS policy and search domains during application Pod template changes”.

D:

This routine guards against another mechanism: A Deployment selector identifies Pods it owns and is generally immutable after creation; patching Service selectors alone does not repair ownership. The recurring exposure in the current case is: Cluster DNS search domains and dnsPolicy control short-name resolution; resolving a public hostname is not proof of Kubernetes Service resolution. The matching preventive check is “Test DNS policy and search domains during application Pod template changes”.