My networking isn’t quite up to par anymore, but you should just need to connect everything to the switch. No need for an a or b. Connecting the nas, server, and two pcs to the single switch would allow them to all talk to each other.
Sorry, i don't understand.
You have a switch, right? Just connect everything to the switch and everything would talk with everything. I don't see the problem.
Modem >>> ROUTER first. United the modem in your diagram is a router combo unit.
I need to read more about your post in a bit.
This is an unusual home network topology. This would be something like a distribution layer, so a and b would be something like a multilayer switch. This would only really be for something like load balancing or redundancy, and isn’t really a home network topology. I guess the question is really, what are you trying to do? If the answer is just dick around with network stuff, a switch is what you need. If you are trying to set up a normal home lab network, I would drop them as other commenters have shown.
That diagram hurt my brain
Why all this mess? Just connect everything to the switch.. it is its purpose!
Furthermore, the router is not present, is it inside the modem?
