Kubernetes: Node vs Hosts vs Cluster terminology -

http://kubernetes.io/docs/getting-started-guides/centos/centos_manual_config/

"this guide 1 node working. multiple nodes requires functional networking configuration done outside of kubernetes."

so, node made of many hosts?
thought cluster made of many hosts. cluster made of many nodes instead?

each node had master , minions cluster has more 1 master?

• host: machine (physical or virtual)
• master: host running kubernetes api server , other master systems
• node: host running kubelet + kube-proxy pods can scheduled onto
• cluster: collection of 1 or masters + 1 or more nodes