Can I please get 3 different types of Networks and their diagrams.?

Answer 1

I think you might be referring to the 3 common types of network topoligies, in that case it's Bus, Ring and Star, but there's also Tree and Mesh topology types as well... Check these links:
http://en.wikipedia.org/wiki/Network_topology
http://compnetworking.about.com/od/networkdesign/a/topologies.htm