What is the primary responsibility of kube-scheduler?

Assign newly created pods to nodes based on resource requirements and constraints

etcd in a Kubernetes cluster is:

A distributed, consistent key-value store holding all cluster state

A DaemonSet is best used when you need to:

Run one pod per node (or subset of nodes) for cluster-wide agents

A pod is stuck in Pending. Which of these is the LEAST likely cause?

The container inside has crashed repeatedly

What is the defining purpose of a StatefulSet vs a Deployment?

It provides stable network identities (predictable pod names) and stable persistent storage per replica

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30 questions d'entraînement CNCF KCNA gratuites

De vraies questions d'entraînement pour l'examen CNCF Kubernetes and Cloud Native Associate (KCNA), avec les réponses et des explications détaillées. Mis à jour en 2026.

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75%

Durée de l'examen

90 minutes

Banque de questions

Plus de 463 questions

Voici 30 vraies questions d'entraînement pour l'examen CNCF Kubernetes and Cloud Native Associate (KCNA). Chaque question affiche la bonne réponse et une explication détaillée lorsque vous la révélez. Servez-vous en pour évaluer votre niveau : si vous obtenez moins de 70 % à ces 30 questions, prévoyez au moins 4 semaines de révision supplémentaires avant de réserver.

Questions d'entraînement KCNA

FreePracticeQuiz.questionLabelKubernetes Fundamentals
What is the primary responsibility of kube-scheduler?
A
Store cluster configuration and state
B
Maintain network rules on each node
C
Assign newly created pods to nodes based on resource requirements and constraints
D
Execute container images on worker nodes
FreePracticeQuiz.questionLabelKubernetes Fundamentals
etcd in a Kubernetes cluster is:
A
A container runtime
B
The default ingress controller
C
A distributed, consistent key-value store holding all cluster state
D
A load balancer for API requests
FreePracticeQuiz.questionLabelKubernetes Fundamentals
Which component runs on every worker node and ensures containers described in PodSpecs are running?
A
kube-controller-manager
B
kube-proxy
C
kubelet
D
cloud-controller-manager
FreePracticeQuiz.questionLabelKubernetes Fundamentals
A DaemonSet is best used when you need to:
A
Run N replicas of a stateless web app
B
Run a batch job to completion
C
Run one pod per node (or subset of nodes) for cluster-wide agents
D
Run a one-shot task on a schedule
FreePracticeQuiz.questionLabelKubernetes Fundamentals
Which Service type exposes the service on each node's IP at a static port?
A
NodePort
B
LoadBalancer
C
ExternalName
D
ClusterIP
FreePracticeQuiz.questionLabelKubernetes Fundamentals
You need to provide a database password to a pod. Which object is most appropriate?
A
A plain env var in the pod spec
B
PersistentVolume
C
ConfigMap
D
Secret
FreePracticeQuiz.questionLabelKubernetes Fundamentals
A pod is stuck in Pending. Which of these is the LEAST likely cause?
A
A PersistentVolumeClaim cannot be bound
B
The container inside has crashed repeatedly
C
Taints on nodes the pod does not tolerate
D
Insufficient node CPU or memory
FreePracticeQuiz.questionLabelKubernetes Fundamentals
A Deployment directly manages which object?
A
ReplicaSets
B
Pods
C
StatefulSets
D
DaemonSets
FreePracticeQuiz.questionLabelKubernetes Fundamentals
What is the defining purpose of a StatefulSet vs a Deployment?
A
It performs rolling updates faster than a Deployment by skipping readiness checks
B
It provides stable network identities (predictable pod names) and stable persistent storage per replica
C
It enables horizontal scaling without an upper replica limit
D
It automatically provisions PersistentVolumes without needing a StorageClass
FreePracticeQuiz.questionLabelKubernetes Fundamentals
Which kubectl command applies configuration declaratively?
A
kubectl deploy file.yaml
B
kubectl run file.yaml
C
kubectl create -f file.yaml
D
kubectl apply -f file.yaml
FreePracticeQuiz.questionLabelKubernetes Fundamentals
Labels and selectors are used to:
A
Define resource limits
B
Identify and group objects, enabling loose coupling between them
C
Enforce pod-to-pod security
D
Encrypt data at rest
FreePracticeQuiz.questionLabelKubernetes Fundamentals
A namespace in Kubernetes provides:
A
Separate etcd instances
B
Encrypted pod traffic
C
A scope for resource names, enabling multi-tenant division of a cluster
D
Strong security isolation by default
FreePracticeQuiz.questionLabelKubernetes Fundamentals
Which statement about Pods is true?
A
Each container in a pod has its own IP
B
A pod must contain exactly one container
C
Pods automatically survive node failures
D
Containers in a pod share the network namespace and can share volumes
FreePracticeQuiz.questionLabelKubernetes Fundamentals
A PersistentVolumeClaim (PVC) represents:
A
A backup of pod data
B
A compressed log archive
C
A user's request for storage that binds to a PersistentVolume
D
A physical disk on a node
FreePracticeQuiz.questionLabelKubernetes Fundamentals
An Ingress resource provides:
A
DNS resolution
B
HTTP/HTTPS routing rules from outside the cluster to internal Services
C
Container image storage
D
Pod-to-pod encryption
FreePracticeQuiz.questionLabelKubernetes Fundamentals
Which component maintains iptables/IPVS rules on nodes to implement the Service abstraction?
A
CoreDNS
B
kubelet
C
kube-scheduler
D
kube-proxy
FreePracticeQuiz.questionLabelKubernetes Fundamentals
Taints and tolerations are used to:
A
Automatically drain and cordon nodes during cluster upgrades
B
Limit the CPU and memory a pod is allowed to consume
C
Attract pods to specific nodes based on node labels
D
Repel pods from nodes unless the pod explicitly tolerates the taint
FreePracticeQuiz.questionLabelKubernetes Fundamentals
A ReplicaSet's core responsibility is to:
A
Ensure a specified number of pod replicas are running at any time
B
Mount persistent storage
C
Schedule pods across zones
D
Perform rolling updates and rollbacks
FreePracticeQuiz.questionLabelKubernetes Fundamentals
ConfigMaps should NOT be used for:
A
Feature flags
B
Non-sensitive env variables
C
Database passwords and API tokens
D
Application config files
FreePracticeQuiz.questionLabelKubernetes Fundamentals
When a pod is deleted, its IP address:
A
Is tied to the pod name
B
Is released; a new pod gets a different IP
C
Is reserved for that pod if recreated
D
Persists for 5 minutes
FreePracticeQuiz.questionLabelKubernetes Fundamentals
Which is NOT a Kubernetes workload resource?
A
StatefulSet
B
Deployment
C
LoadBalancer
D
Job
FreePracticeQuiz.questionLabelKubernetes Fundamentals
A CronJob creates:
A
A StatefulSet
B
A Deployment
C
Jobs on a time-based schedule
D
A ReplicaSet
FreePracticeQuiz.questionLabelKubernetes Fundamentals
How do control plane components typically talk to worker nodes?
A
Through kube-proxy only
B
Via etcd replication
C
Directly via SSH
D
Through the kubelet on each node, which watches the API server
FreePracticeQuiz.questionLabelKubernetes Fundamentals
The Horizontal Pod Autoscaler (HPA) scales based on:
A
CPU, memory, or custom/external metrics of pods
B
Image size
C
The number of nodes
D
Time of day
FreePracticeQuiz.questionLabelKubernetes Fundamentals
RBAC permissions are granted by which pair of resources?
A
Roles/ClusterRoles and RoleBindings/ClusterRoleBindings
B
Policies and Bindings
C
Users and Groups
D
Namespaces and Labels
FreePracticeQuiz.questionLabelKubernetes Fundamentals
Which statement is true about the container image tag latest?
A
Guarantees the newest secure version
B
Is a mutable pointer that can change, making deployments non-reproducible
C
Cannot be used in production
D
Is immutable and version-pinned
FreePracticeQuiz.questionLabelKubernetes Fundamentals
A pod requests 250m CPU and 256Mi memory with no limits set. What does this mean?
A
It will be OOM-killed if it exceeds 256Mi
B
The pod cannot exceed 250m CPU
C
The pod is guaranteed those resources; can burst higher if node capacity allows
D
It will not be scheduled
FreePracticeQuiz.questionLabelKubernetes Fundamentals
Which probe determines if a container is ready to receive traffic from a Service?
A
Startup probe
B
Liveness probe
C
Health probe
D
Readiness probe
FreePracticeQuiz.questionLabelContainer Orchestration
Which interface standardizes how kubelet talks to container runtimes?
A
CNI
B
OCI
C
CSI
D
CRI
FreePracticeQuiz.questionLabelContainer Orchestration
CNI plugins are responsible for:
A
Storing cluster state
B
Assigning IPs and configuring pod network connectivity
C
Providing DNS
D
Scheduling pods

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Questions d'entraînement KCNA

What is the primary responsibility of kube-scheduler?

etcd in a Kubernetes cluster is:

Which component runs on every worker node and ensures containers described in PodSpecs are running?

A DaemonSet is best used when you need to:

Which Service type exposes the service on each node's IP at a static port?

You need to provide a database password to a pod. Which object is most appropriate?

A pod is stuck in Pending. Which of these is the LEAST likely cause?

A Deployment directly manages which object?

What is the defining purpose of a StatefulSet vs a Deployment?

Which kubectl command applies configuration declaratively?

Labels and selectors are used to:

A namespace in Kubernetes provides:

Which statement about Pods is true?

A PersistentVolumeClaim (PVC) represents:

An Ingress resource provides:

Which component maintains iptables/IPVS rules on nodes to implement the Service abstraction?

Taints and tolerations are used to:

A ReplicaSet's core responsibility is to:

ConfigMaps should NOT be used for:

When a pod is deleted, its IP address:

Which is NOT a Kubernetes workload resource?

A CronJob creates:

How do control plane components typically talk to worker nodes?

The Horizontal Pod Autoscaler (HPA) scales based on:

RBAC permissions are granted by which pair of resources?

Which statement is true about the container image tag latest?

A pod requests 250m CPU and 256Mi memory with no limits set. What does this mean?

Which probe determines if a container is ready to receive traffic from a Service?

Which interface standardizes how kubelet talks to container runtimes?

CNI plugins are responsible for:

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Questions fréquentes

Continuer à réviser

Réussissez KCNA du premier coup

Which statement is true about the container image tag `latest`?