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 preguntas de práctica gratuitas de CNCF KCNA

Preguntas de práctica reales para el examen CNCF Kubernetes and Cloud Native Associate (KCNA), con respuestas y explicaciones detalladas. Actualizado en 2026.

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Duración del examen

90 minutos

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Más de 463 preguntas

A continuación tienes 30 preguntas de práctica reales para el examen CNCF Kubernetes and Cloud Native Associate (KCNA). Cada pregunta muestra la respuesta correcta y una explicación detallada cuando la revelas. Úsalas para medir tu preparación: si obtienes menos del 70 % en estas 30 preguntas, prevé al menos 4 semanas más de estudio antes de reservar.

Preguntas de práctica de 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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Sí. Estas 30 preguntas se han extraído directamente de nuestro banco de Más de 463 preguntas, redactadas y revisadas por profesionales certificados. Reproducen el estilo, la dificultad y el alcance del examen oficial de CNCF KCNA.

¿Es difícil el examen KCNA?+

El examen CNCF Kubernetes and Cloud Native Associate (KCNA) se considera un examen con nota de corte (puntuación de aprobado: 75%). La mayoría de los candidatos necesitan entre 4 y 8 semanas de preparación centrada. Usa estas preguntas gratuitas para saber en qué punto estás antes de comprometerte con un plan de estudio completo.

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30 preguntas de práctica gratuitas de CNCF KCNA

Preguntas de práctica de 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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Preguntas frecuentes

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Aprueba KCNA en el primer intento

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