I have these meetings the first Saturday of every month where a bunch of folks from the local area get together and talk about computer/network security. I’ve noticed recently that a lot of the presentations are flying over some of the folks heads, like when I started to explain Nmap and OS fingerprinting to someone and found out they did not know what a port was. What I’m asking for is advice on any e-texts I could print off and give to new folks to catch them up on TCP/IP networks, and maybe a 2nd one that covers the basics of computer security. What are the best one stop e-texts out there that I could give out that would get people up to speed enough to understand the more experienced folks presentations? Any suggestions?