GNS3 is a graphical network simulator and an excellent complementary tool to real labs for network engineers, administrators and people wanting to pass certifications such as CCNA, CCNP, CCIP, CCIE, JNCIA, JNCIS, JNCIE to design complex network topologies.
You may run simulations or configure devices ranging from simple workstations to powerful Cisco routers.
GNS3 is an opensource, free program operates on multiple operating systems. It can also be used to experiment features of Cisco IOS, Juniper JunOS or to check configurations that need to be deployed later on real routers.
This project is an open source, free program that may be used on multiple operating systems, including Windows, Linux, and MacOS X.
httpv://www.youtube.com/watch?v=Ni1v9MyQ0Nc
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