Which Kubernetes object ensures that each node is limited to running no more than one pod?

Unicast is a networking term for one-to-one communication, not a Kubernetes object related to pod deployment.

A Deployment manages a set of identical Pods, ensuring a desired number of replicas are running, but it does not guarantee only one pod per node; multiple pods can run on a single node if resources allow.

A DaemonSet ensures that a copy of a specified Pod runs on all (or some subset of) nodes in a Kubernetes cluster, and critically, it ensures that only one instance of the Pod runs per node. This is ideal for node-level agents like monitoring or logging.

A ReplicaSet ensures a specified number of Pod replicas are running at all times, similar to Deployment, but it doesn't enforce a one-pod-per-node constraint.