https://docs.vmware.com/en/VMware-Cloud-Foundation/4.5/vcf-admin/GUID-59E5BEE3-B157-426D-A40C-F21171586863.html Before you can deploy vRealize Suite components or implement the Identity and Access Management for VMware Cloud Foundation validated solution, you must deploy Application Virtual Networks in the management domain. An Application Virtual Network (AVN) is a software-defined networking concept based on NSX-T Data Center that allows the hosting of management applications on NSX segments. In NSX-T Data Center, segments are virtual layer-2 domains. You can create overlay-backed NSX segments or VLAN-backed NSX segments. Both options create two NSX segments (Region-A and X-Region) on the NSX Edge cluster deployed in the default management vSphere cluster. Those NSX segments are used when you deploy the vRealize Suite products. Region-A segments are local instance NSX segments and X-Region segments are cross-instance NSX segments.
According to the VMware Cloud Foundation documentation1, an NSX Edge cluster is a group of NSX Edge nodes that provide centralized network services such as routing, load balancing, firewall, and NAT. An NSX segment is a virtual layer-2 domain that can be either overlay-backed or VLAN-backed. AVNs are NSX segments that are used to host management applications such as vRealize Suite components.
NSX Load Balancer is not a component of NSX-T Data Center, but a service that is provided by the NSX Edge nodes. It allows you to distribute network traffic across multiple servers or virtual machines2 NSX Global Manager is not present in VMware Cloud Foundation when AVNs are deployed, because it is only available when NSX Federation is enabled. NSX Federation allows you to manage multiple NSX-T Data Center instances across different sites from a single pane of glass3 NSX Intelligence is not present in VMware Cloud Foundation when AVNs are deployed, because it is an optional feature that requires a separate license and installation. NSX Intelligence is a distributed analytics engine that provides visibility and security recommendations for the NSX-T Data Center environment4