Leaf nodeAn overlay network is a computer network that is built on top of another network. Nodes in the overlay network are connected by virtual links., or terminal nodeAn overlay network is a computer network that is built on top of another network. Nodes in the overlay network are connected by virtual links.. is any nodeAn overlay network is a computer network that is built on top of another network. Nodes in the overlay network are connected by virtual links. that does not have child nodes.