Define the Networking supervisors in OpenStack Cloud -...

Flat Network Manager: This places all VMs on a single system using the same subnet and the bridge from made by the administrator. In this way, all VMs share a similar network that can be interconnected and are known to have Flat Network Manager.
Flat DHCP Network Manager: Much like the above aside from that the IP delivers to VM are assigned through DHCP (Dynamic Host Configuration Protocol).
VLAN: Unlike the single system idea, VLAN encourages more secure and separate system to VMs. It has a physical change to offer different virtual network and distinct IP range and extension for each tenant. This is to be sure most ideal decision for multi-inhabitant/venture condition.

Define the Networking supervisors in OpenStack Cloud