what happens in Internetworking somebody please tell this doubt

Question

i have read internetworking is done by two  processes

first is 1)Connection oriented /concatenation of virtual circuits subnets

second is 2 )Datagram internet style

what happens in internetworking can somebody please explain with diagram

Answer 1

Hope this tutorial helps you

http://www.computernetworkingnotes.com/ccna-study-guide/internetworking-in-computer-network.html