Sounds like a dumb question but I bet a lot of people don't know either. I understand servers, clients, modems, routers, ISP's, ect; but what I don't understand is what makes up the backbone structure of the internet. I have never seen any clear UML diagram or description of the backbone of the internet. I have heard things about 7 main servers (don't quote me on that), but who owns each server, when were they built, how old are they, how do they interact? It seems surprisingly hard to find information on this.
All my google searching provides seemingly vague and outdated information.
Edit: Sorry if you found this question vague, not only did I write it late last night, but I have a vague understanding of how the backbone of the net works thus making my question vague.