Guys I have a question regarding internet which is bothering me from a long time an I would like to request if anybody can explain me thoroughly!
Basically in pakistan PTCL, NTC and Wateen have the only independent infrastructure to join link with the entire world and provide facilities like INTERNET etc.. 98% other ISP's in pakistan take internet from PTCL; (Pakistan interent Exchange).

Now my questions are:
1.) From where this internet comes from?
2.) Who manages internet?
3.) Who manages Domain Name system?
4.) Who provides us IP whenever we log on to internet?
5.) Do PTCL have to buy international Bandwidth?
6.) If yes then from whom to buy n what are the bandwidth rates?
7.) How the whole networking/linking the counteries is working; how the submarine cable connects counteries and who owns submarine cable?
8.) Where is the main centre of the internet?

GUYS HELP ME!!
These questions have now really started irritating me!