Every house is different, no need to ask a neighbor. The source rg6 cable comes from the outside box into your garage network/irrigation box. You are going to see a dozen black cables and hopefully some of them are connected to a splitter or maybe just 1 is connected together. Have xfinity turn on your service. If some/all cables are connected, then you have a good chance of being able to put the xfinity modem/router in any of the rooms that are hooked up to this splitter. If there is only 1 black cable connected with a union adopter, then you will have to go from room to room to see if the xfinity box powers up correctly.
Never think that these black rg6 cables are only used for internet or cable. They aren’t, you can use them for other things. For example, I use some of my rg6 cables for a moca network so somebody moving in after us is going to see a lot more THINGS in the network/irrigation box and I’d advise nobody disconnect a black cable if they don’t know what it does, there could be a small voltage on the line.
Also, don’t assume the network box is best placed in your living room. For me (a network guy) it would be the worst location. I needed access to a network cable (I rewired all of my 2-pair phone jacks in every room and in the network/irrigation panel for Ethernet and put a network switch in the garage box), and there is only a couple places in the house that had this, so I used a bedroom to house my xfinity box. I then go out of the xfinity box using Ethernet to the Ethernet port in the wall. I then setup a mesh wired network for the best coverage throughout the home. I saved over $800 rewiring the phone jacks compared to having galaxy do it. It cost me $100 for the tools and fluke tester.
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