information about network

http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci212644,00.html

(remove any imbedded spaces from the URL)

I'm sorry, but because of the overly broad nature of this question and the lack of space to thoroughly discuss even the smallest of subtopics related to this subject, you either need to narrow the focus of your question, or start your research in your local library and then ask specific question on topics you don't understand.

I'm not trying to be mean-spirited with this reply, but there is no way for anyone to give you any kind of simple, coherent answer to such a question.