CKA Cluster Architecture 2

Question 1

Which component is responsible for maintaining the desired state of objects in a Kubernetes cluster?

Accepted Answer

kube-controller-manager

Answer

The kube-controller-manager runs controllers that continuously watch the cluster state and reconcile it with the desired state.

Question 2

What is the primary function of the kube-scheduler?

Accepted Answer

Assign Pods to Nodes based on resource availability and constraints

Answer

The kube-scheduler watches for unscheduled Pods and selects an appropriate Node based on resource requirements, affinity rules, and other constraints.

Question 3

Which communication protocol does the kubelet use to pull container images and manage container lifecycle?

Accepted Answer

Container Runtime Interface (CRI)

Answer

The kubelet communicates with container runtimes through the Container Runtime Interface (CRI), which is a plugin interface.

Question 4

In a Kubernetes cluster, which component handles east-west (Pod-to-Pod) network traffic routing?

Accepted Answer

kube-proxy

Answer

kube-proxy runs on each Node and maintains network rules (iptables or IPVS) that enable Pod-to-Service and cross-Node Pod communication.

Question 5

What happens to etcd data if all etcd members in a cluster are simultaneously lost without a backup?

Accepted Answer

All cluster state is permanently lost and the cluster cannot recover

Answer

etcd is the sole source of truth for cluster state; without a backup and all members lost, all object definitions, secrets, and configurations are permanently gone.

(CKA) Certified Kubernetes Associate Practice Test

(CKA) Certified Kubernetes Associate Practice Test

CKA Cluster Architecture 2