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.
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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.
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.
That diagram hurt my brain
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Modem >>> ROUTER first. United the modem in your diagram is a router combo unit.
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I need to read more about your post in a bit.
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?