So my first step is to see if I can get a map of what's involved in the network; hence the desire to get NTM working for me. (Or am I going down the wrong road right at the beginning?) I go through the initial "newbie" NTM video, and I'm immediately flummoxed when they talk about SNMP credentials. (As I said, I understand the network ideas at a high level.) Does each device (switch, router, WAP, PC, laptop, mac, etc.) need to have this credential configured as well?
At a higher level, my question is: how can I get a map of my network? I connect my laptop via wired utp to the network, enter the subnet address and mask, and let it scan. It shows me a bunch of ICMP "devices" as well as two printers. It even displays my laptop's system name; all the others are simply listed with IP addresses. It doesn't show any devices connected to the various WiFi WAPs that I know are configured.
Is there some tutorial that goes into all this? The one I went through assumed I knew a lot more than I did (such as the credentials). Or am I asking for a network education first?