A whole network can be established on a single PC as the application permits you to create several virtual network devices like routers, computers and switches etc. Though the devices are virtual but they have the characteristics of real devices. Network Emulation with NetKit 4 is very easy and requires nothing but writing a simple file which will describe the link level topology of the network which is to be emulated. After writing the file NetKit will start the networking emulation. Networks can also be described by XML language which is known as NetML Please note you can also Download Wireshark which is separate tool for IP & Packet scanning.
On a conclusive note we can say that NetKit 4 is a very handy application which will allow you to perform experiments for understanding the networks thoroughly.