VLAN allows you to create a virtual switch within a switch! So assuming you are working with a 24 port switch. You can configure ports 1 - 10 ports to be on VLAN1 (192.168.1.0/24), and ports 11-20 ports to be on VLAN2 (192.168.2.0/24).
So it’s like you have partitioned your switch into two, and now your network looks simpler!
You can combine your dual NICs machines and potentially reduce the latency, and/or double the bandwidth (Not supported with Ubiquiti Unfi).
Isolate any noise between the NAS and the music streamer.
This can be daunting if you have never configure a switch before.
Like #1, devices on VLAN1 cannot communicate with VLAN2 (a router does not exist in this diagram).
Comment from: didG Visitor
Really nice introduction, thanks for sharing and i will follow the next steps for sure. It can be impossible to explain a setup in detail with variety of routers and switchs on the market, but give an example with the main guidelines will be an huge help for that! Happy new year Kith!