I'm quite familiar with IP subnets but still learning about vLANS.
One of our key systems is a client/server accounting system configured with appropriate IP addresses and ports for the clients to access the system. I maintain a 2nd VM of this system as a test/development system. This 2nd system is of course configured with a different IP and ports.
There would be advantages to having the live system and the test system configured identically with same IP and ports, and I'm wondering if the correct application of a vLAN could allow this.
For testing purposes, I would create a clone of a workstation which would go on the same vLAN port.
The test system does not need to communicate with a domain controller.
It does however need to communicate with printers on the main network (and I don't know if allowing this traffic would then create problems).