"Virtual LANs (VLANs) enable a single physical LAN segment to be further isolated so that groups of ports are isolated from one another as if they were on physically different segments." See here:
https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.networking.doc/GUID-7225A28C-DAAB-4E90-AE8C-795A755FBE27.html
The configuration setting that ensures virtual networks on a virtual switch are isolated from each other is:
A. VLAN ID
VLAN (Virtual Local Area Network) ID is a method used to logically divide a physical network into multiple isolated broadcast domains. When applied to virtual switches, assigning different VLAN IDs to different port groups ensures network isolation among the virtual networks. Each VLAN represents a separate broadcast domain, allowing traffic within a VLAN to be kept separate from traffic in other VLANs, thus achieving network isolation for the respective virtual networks connected to the virtual switch.
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