Network plugins in Kubernetes come in a few flavors:
CNI plugins: adhere to the Container Network Interface (CNI) specification, designed for interoperability.  Kubernetes follows the v0.4.0 release of the CNI specification.   Kubenet plugin: implements basic cbr0 using the bridge and host-local CNI plugins  Installation The kubelet has a single default network plugin, and a default network common to the entire cluster. It probes for plugins when it starts up, remembers what it finds, and executes the selected plugin at appropriate times in the pod lifecycle (this is only true for Docker, as CRI manages its own CNI plugins).