4.8.1 Background
A network pool is an object in vCloud that creates and manages isolated networks using vSphere port groups. The vSphere port groups can be pre-provisioned in vSphere or created dynamically by vCloud as needed for organization or vApp networks.
The following types of network pools are available in vCloud Director:

VXLAN (
dynamically created vSphere port groups).

VLAN-backed (
dynamically created vSphere port groups).

vCloud Network Isolation-backed (
dynamically created vSphere port groups).

vSphere port group-backed (
manually created vSp
here port groups).
This example
uses the VLAN-backed network pool.