Mr Moxture.
I think our "discussion" is wandering away from being useful to the OP.
I volunteer TWO places.
In one, the modem is furnished by Verizon (phone company) and has one Ethernet port. I don't remember the manufacturer / model - but it isn't one that is common in the stores. Maybe Westell. I've connected a switch to that.
In the other location, there is an Ethernet port on the wall which goes to a Linksys router with 4 Ethernet ports and WiFi on the user side. I inherited this in working condition.
I think we owe it to the OP to drop the discussion at this point.
seacue
l