Certified Kubernetes Administrator (CKA) Practice Test

The primary function of a Kubernetes Node is to host pods and provide the Kubernetes runtime environment. Each node in a Kubernetes cluster is a physical or virtual machine that runs the necessary services to execute pods, which are the smallest deployable units in Kubernetes. Each pod can contain one or more containers that share resources and network settings.

Nodes run the container runtime (like Docker or containerd), which is responsible for running the containers, along with the kubelet, which communicates with the Kubernetes API server and ensures that the containers are running as expected. Additionally, nodes may also run other components such as kube-proxy, which manages network rules for the services in the cluster.

Other choices relate to important aspects of Kubernetes but do not encapsulate the primary function of a node. Commands for resource management are executed by various Kubernetes components rather than the nodes themselves. Network policies define how pods communicate but are not specific functions of nodes. While managing storage resources is an essential aspect of Kubernetes, it is typically a function assigned to the underlying storage systems and controllers rather than being directly managed by the nodes themselves.