This device is widely available and comes with a UDM PRO package.
This device is widely available and comes with a UDM PRO package.
To achieve this setup, you'd need two separate lines: one from the Server Room to the front door for WAN, and another for connecting the switch to the UDM-Pro. This would allow you to replace the ISP router instead of daisy-chaining the switch directly to it. Also, consider that the UDM Pro requires a dedicated WAN line rather than relying on the switch to handle both WAN and other connections.
I'll run a second cable if it's straightforward; otherwise, use VLANs to create two separate networks on one cable. I'll connect the UniFi switch for easier management. Make sure the switch is powered by the UDM Pro's LAN, then apply VLANs as needed. You can handle traffic through VLANs too. The diagram should show this configuration.
The setup uses a switch with VLANs to manage both wide area and local network traffic on a single cable.
You should have DSL. Then connect the DSL modem to the UDM or a switch with VLANs configured properly. Yes, you'll need a modem to turn DSL into Ethernet.