I used to have a Leviton box as my main network access point. I still haven't taken it off the wall but I did replace it's functionality with a nearby rack and gear from Ubiquiti. But right now, all this is working and while it looks like a spaghetti mess, it's really important to understand that you bought a house that is already pre-wired for high speed internet to several rooms. If the wires are labeled, even better. If not, you can test them one by one using some of the techniques others have listed in this thread. But I would do nothing at first and plan what upgrades you would like to accomplish. Good luck.
I used to have a Leviton box as my main network access point. I still haven't taken it off the wall but I did replace it's functionality with a nearby rack and gear from Ubiquiti. But right now, all this is working and while it looks like a spaghetti mess, it's really important to understand that you bought a house that is already pre-wired for high speed internet to several rooms. If the wires are labeled, even better. If not, you can test them one by one using some of the techniques others have listed in this thread. But I would do nothing at first and plan what upgrades you would like to accomplish. Good luck.