KCNA Networking & Service Discovery 2

Question 1

Which Kubernetes Service type creates an external load balancer in cloud environments?

Accepted Answer

LoadBalancer

Answer

The LoadBalancer Service type provisions an external cloud load balancer that routes traffic to the backend pods.

Question 2

What does a headless Service (ClusterIP: None) return when queried via DNS?

Accepted Answer

Individual pod IP addresses as DNS A records

Answer

Headless Services bypass kube-proxy and return the individual pod IPs directly as DNS A records, enabling direct pod addressing.

Question 3

Which field in a NetworkPolicy spec restricts which pods can initiate connections TO the selected pods?

Accepted Answer

ingress

Answer

The ingress field defines rules for inbound traffic to the selected pods, specifying allowed sources.

Question 4

In Kubernetes DNS, what is the fully qualified domain name for a Service named 'db' in namespace 'prod'?

Accepted Answer

db.prod.svc.cluster.local

Answer

Kubernetes DNS follows the pattern ..svc., defaulting to cluster.local.

Question 5

What is the purpose of kube-proxy in a Kubernetes cluster?

Accepted Answer

To maintain iptables/IPVS rules that implement Service virtual IPs

Answer

kube-proxy watches the API server and programs iptables or IPVS rules on each node to forward traffic destined for Service ClusterIPs to backend pods.

(KCNA) Kubernetes and Cloud Native Associate Practice Test

(KCNA) Kubernetes and Cloud Native Associate Practice Test

KCNA Networking & Service Discovery 2