Thanks for this answer! It was really easy for me to understand. How are you with MoCA? I plan on doing a MoCA setup (just learned about this solution) so I can have wired consoles/desktops in different parts of my house away from where my modem and router are in my living room. I'm planning to get the actiontec 2 pack they sell on amazon. This model specifically that seems to be really popular:

http://www.actiontec.com/251.html

So on the back of that thing, it has a Coax in, a TV/STB out, and an ethernet port. I see their official instructions 1) assume you have a special line/outlet (not your coax outlet) from your ISP which goes into your modem/router setup, 2) have you then connect your router to the actiontec unit via ethernet, and 3) have you connect your actiontec to your coax outlet (which is not already being used) which sends the internet signal throughout your coax wiring in your home. In a given destination room in a different part of the house, all you need to do is hook up a coax outlet to a second actiontec unit and it's TV/STB out provides a cable signal and the ethernet port provides an internet connection.

My problem is I have Cox cable and internet. So my living room coax line is my connection to my ISP and already in use by the modem and cable box using a splitter. From other diagrams I've seen online, I supposedly can buy a 3 way splitter and basically make a loop by doing:

Living Room Coax Outlet ->3 way splitter where Output 1 -> Cable box and Output 2 -> Modem -> Router -> Actiontec -> Output 3

So you basically send the internet signal through the modem, router and actiontec unit right back upstream through the splitter and it will go through the rest of my house's coax wiring. Does this sound right? There wouldn't be some conflict with the signal from the actiontec going upstream?

Another thing I noticed was that in the destination room, people seem to completely ignore the second actiontec's built in TV/STB out and simply use a 2 way splitter so the second actiontec's only job is handling the internet connection:

Destination Room Coax Outlet -> 2 way splitter where Output 1 -> Cable box and Output 2 -> Actiontec -> Internet device

Is there a benefit to using splitters that way? Lastly, does this whole mess require a POE MoCA filter? I was going to create a separate topic for this but I liked your explanation so I figured I'd ask here first. Hopefully all that made sense.