I have a security camera system I have to help install for a business. There are two ways to install this systems cameras. They’re connected via Ethernet cables one of two ways. First is camera to NVR then NVR to router. Second is camera to PoE switch, switch to router and router to NVR. Can someone please explain in laymen’s terms what the differences are in the two ways of connecting these, please? I can provide a picture of these connections if need be. Thanks guys.