KCNA Container Orchestration 5

Question 1

Which Kubernetes object should you use to expose a set of Pods as a network service with a stable IP and DNS name?

Accepted Answer

Service

Answer

A Service provides a stable virtual IP and DNS name that load-balances traffic across a set of Pods matching its selector.

Question 2

What is the effect of setting `terminationGracePeriodSeconds: 0` on a Pod?

Accepted Answer

The Pod is immediately killed with no grace period

Answer

Setting this to 0 causes the Pod to be force-killed immediately without allowing containers to handle SIGTERM.

Question 3

In Kubernetes, what is the purpose of a Namespace?

Accepted Answer

Partitions cluster resources between multiple users or teams

Answer

Namespaces provide a mechanism to divide cluster resources between multiple users, teams, or projects with logical isolation.

Question 4

What is the primary difference between `kubectl apply` and `kubectl create`?

Accepted Answer

`apply` is declarative and updates existing resources; `create` fails if the resource already exists

Answer

`kubectl apply` is declarative and merges changes into existing resources, while `kubectl create` returns an error if the resource already exists.

Question 5

Which container runtime interface does Kubernetes use to communicate with container runtimes like containerd or CRI-O?

Accepted Answer

Container Runtime Interface (CRI)

Answer

The Container Runtime Interface (CRI) is the API that kubelet uses to interact with compatible container runtimes.

(KCNA) Kubernetes and Cloud Native Associate Practice Test