Palo Alto Networks (PANW) System Engineer (PSE) Practice Exam

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What is the basic operational unit of Kubernetes?

Node
Container
Kubernetes service
Pod

The correct answer is: Pod

The basic operational unit of Kubernetes is a Pod. A Pod is the smallest deployable unit in Kubernetes, and it can contain one or more containers that share the same network namespace, IP address, and storage resources. This means that containers within a Pod can easily communicate with each other through localhost and can access shared storage volumes, making it efficient for tightly coupled application components. Pods are particularly important because they allow Kubernetes to manage the lifecycle of the contained containers in a holistic manner. When a Pod is created, all its containers are started, and when a Pod is terminated, all its containers are terminated together. This helps ensure that the components of an application are always running together in the expected configuration, which is crucial for maintaining application stability and performance. The other options represent different elements or abstractions used within Kubernetes but do not serve as the smallest deployable unit. Nodes refer to the worker machines that run the Pods, containers are the actual runtime instances of applications, and Kubernetes services abstract the communication between Pods, but none of these encapsulates the deployment and management aspect as effectively as a Pod does.