GNS3

What is GNS3 ? GNS3 is a graphical network simulator that allows simulation of complex networks.To allow complete simulations, GNS3 is strongly linked with :Dynamips, the core program that allows Cisco IOS emulation. Dynagen, a text-based front-end for Dynamips.Qemu, a generic and open source machine emulator and virtualizer.GNS3 is an excellent complementary tool to real labs for network