So I just moved into a new house and noticed that every room has a wall plate containing coax cable hookups and Cat5 ports. My modem-router is in the living room and delivers weak internet via WiFi to my pc in the room down the hall. Can it be as simple as me plugging one cable from the modem to the Cat5 port in the wall near it in the living room, and then another cable from my pc to the Cat5 port in the wall of that room?