Certified Kubernetes Application Developer (CKAD) Practice Test

To list all namespaces in a Kubernetes cluster, the command to use is `kubectl get namespaces`. This command specifically queries the Kubernetes API to retrieve a list of all namespaces currently present in the cluster. Namespaces are a way to partition resources in the cluster, and this command directly targets the resource type 'namespaces', providing a clear and concise output of their names and statuses.

Using `kubectl list namespaces` is not a valid command syntax in Kubernetes, as the `list` verb is not recognized in this context. The command `kubectl get all` retrieves all resources in the current namespace, but it does not specifically list namespaces. The option about viewing namespaces only in the dashboard suggests a limitation in functionality that is not the case, as all necessary namespace information can be retrieved through the command line interface.

Understanding the specific command structure and the resources you are interacting with is crucial in Kubernetes, and `kubectl get namespaces` is the correct approach for obtaining the names of all namespaces in the cluster.