Originally posted here by cacosapo
As a source of knowledge, i would recommend that you first (if you know near nothing) read some basic books about the subject (or google it) and after go to rfc to understand more.
Go direct to them can cause brain damage :P
Indeed. RFCs can be really hard to read and understand. But they're an invaluable source of information if you want to know about the nuts and bolts of a protocoll.