How to create a corporate network for a university?

Question

Computer networks

Hello guys.
I wanted to create a corporate network for the university.
The scheme is as follows:

I do not know what equipment to buy. Advise....

Answer 1

what the hell is the converter? routerboard.com/CRS212-1G-10S-1SplusIN
routerboard.com/CRS226-24G-2SplusIN

Answer 2

I don't see the internet here. Why then a proxy server?
Also, I don't see which networks should be connected to which? The same FOCL has two ends (I won’t say when there are more than two so as not to confuse), but according to your scheme, it has three of them.
I also don't see any routers. Do you need all hosts to be on the same local network?
From the equipment that you have drawn on the diagram, you need to calculate how many ports per hub (or switch) you need, buy the cheapest managed lengths (the price depends on the ports). Medics can also take lengths. If you still decide that you need proxy servers (although I doubt it), for them, in your case, you can take some old desktop P IV computers from the warehouses of the university.