KCNA Kubernetes Architecture & Components 4

Question 1

What does kube-proxy use by default to implement Kubernetes Service networking on modern Linux nodes?

Accepted Answer

iptables rules

Answer

By default, kube-proxy uses iptables rules to intercept traffic destined for Service ClusterIPs and redirect it to backend Pod IPs.

Question 2

Which Kubernetes API group contains core objects like Pods, Services, and ConfigMaps?

Accepted Answer

/api/v1 (core group)

Answer

Core objects like Pods, Services, Namespaces, and ConfigMaps belong to the core API group, accessed at /api/v1, not /apis.

Question 3

What is a Kubernetes Operator pattern?

Accepted Answer

A method of packaging, deploying, and managing applications using custom controllers and CRDs

Answer

The Operator pattern extends Kubernetes with custom controllers that encode operational knowledge about an application using Custom Resource Definitions.

Question 4

Which admission controller is responsible for setting default values on Pods that do not specify resource requests and limits?

Accepted Answer

LimitRanger

Answer

LimitRanger enforces default resource requests and limits on Pods in a namespace when LimitRange objects are defined.

Question 5

What is the purpose of a PodDisruptionBudget (PDB) in Kubernetes?

Accepted Answer

To ensure a minimum number of Pods remain available during voluntary disruptions

Answer

A PodDisruptionBudget limits the number of Pods of a replicated application that can be voluntarily disrupted simultaneously during operations like node draining.

(KCNA) Kubernetes and Cloud Native Associate Practice Test

(KCNA) Kubernetes and Cloud Native Associate Practice Test

KCNA Kubernetes Architecture & Components 4