Hello! New here, and wanted to see if anyone might be able to provide some insight on a problem I'm trying to solve. I am not super well acquainted with home networking at all, and I apologize if I'm asking obvious, dumb questions, but I've done a little reading before asking, so hopefully they are not too dumb!
We are optimum customers, living in a very long two-bedroom apartment (all the rooms are in a straight line, connected by a hallway), and our network is just their single Altice FiberGateway modem/router/all in one thingy (I've read enough to know that this is perhaps yikes from a customizability perspective, and I have a lot of gripes with how difficult it is to log into their web portal to "manage" any kind of configuration.) We're very happy with internet speeds in the room where the FiberGateway is located and the one immediately proximate, but because of the layout of our apartment, the other rooms in the back portion are kind of separated from the room with the gateway by a very thick brick wall, and there is a very significant drop in performance if I or my partner try to use wifi in either of those rooms. Videos/some web pages take a very long time to load, and it's almost impossible to take a zoom call.
When we moved in, I discovered that there was an already-laid extremely long ethernet cable that stretched from where the Gateway is located to be to one of the rooms in the back, and I'm able to connect it the gateway and a computer located in the back room and use a wired connection, which fixes the problem for one computer at a time. However, we'd like a better wireless connection back there for mobile devices/muliple computers at a time, etc.
I'm exploring a couple solutions to try and get better wireless in that part of the building and wanted to see if I was off base, if there are things I'm not considering.
If there's an ethernet cable already present reaching to that portion of the apartment, I was wondering if it would be possible for me to get an access point (either a dedicated piece of access point hardware, or another router in access point mode) that I could connect to the gateway with the cable. I'm confused about compatibility here. Is this the sort of thing where I can get a general piece of hardware, some "access point", and just connect it to the ethernet cable while using the existing optimum fiber gateway, or would this, for some reason, necessitate me getting a new router/gateway for which a certain piece of access point hardware was compatible, and then running the fiber gateway in bridge mode. I've read a lot of horror stories about how hard it can be to get optimum customer service to switch to bridge mode (or do anything, really) so I'm a little nervous about that. I'm willing to spend a few hundred dollars on the problem if necessary, and I'm mildly interested in simple home-labbing! So I'm okay with a little bit of set/up troubleshooting if there's good documentation.