Certified Kubernetes Administrator (CKA) Practice Test

Validating if the nodes are in the correct status after draining is essential to ensure that the drain operation has succeeded and that the nodes are behaving as expected. The drain command is designed to safely evict all pods from a node while respecting the pod disruption budgets. Once the drain command has completed, checking the status of the nodes confirms that they are indeed in a state that reflects the intended operation, such as being 'NotReady' or unschedulable.

By performing this validation after the drain command, you can assess whether all pods were successfully evicted and if there were any issues during the process. This step can help prevent situations where pods are left running unintentionally, which could lead to unforeseen resource allocation issues or service interruptions.

The other choices deal with moments in the process that do not adequately ensure the results of the drain command are as expected or relevant to the current state of the node's operation. Thus, confirming the status after the drain completion is the correct approach for comprehensive validation.