A) Creating cloud load balancers: When you create a Kubernetes Service of type LoadBalancer, the Cloud Controller Manager interacts with the underlying cloud provider's API to provision, configure, and manage the lifecycle of an external load balancer that directs traffic to the service's pods. This is a core function of the CCM.
B) Updating node status: The CCM can interact with the cloud provider to check the health and status of the underlying virtual machines or instances that make up the Kubernetes nodes. It updates the Node objects in Kubernetes based on this information (e.g., marking a node as NotReady if the cloud provider reports the VM is stopped or terminated). This is a function of the CCM (specifically the Node Controller within the CCM).
C) Scheduling pods: Deciding which node a pod should run on based on resource requests, limits, affinity rules, taints, tolerations, etc., is the primary responsibility of the kube-scheduler, a core Kubernetes control plane component. This is not handled by the Cloud Controller Manager.
D) Configuring network routes: The CCM often includes a Route Controller that configures network routes within the cloud provider's network (like VPC routes in AWS or UDRs in Azure) to enable communication between pods on different nodes, especially when using certain CNI plugins or network configurations. This is often a responsibility of the CCM.