It renders the facility to have switches, routers and server’s CLI (command line interface) as well as the choice of adding end devices such as Voice Phone, Laptop, PC, etc. With the help of this software, users can simulate the entire configuration of Cisco switches and routers by using simulated type command-line interface. Related – Cisco Packet Tracer Download & Installation Windows The tool authorizes the users to build network topologies as well as replicate modern era computer networks. On the other hand, Packet Tracer is a popular cross-platform visual simulation tool that has been designed by Cisco Systems. It employs Dynamips emulation software for successful simulation of Cisco IOS. The key function of this emulator is to sanction a combination of real and virtual devices so that an uninterrupted functioning of complex networks can be simulated. GNS3 or Graphical Network Simulator-3 is one of its kind network software emulator that was first released in the year 2008.