Description

                                                                                 
                                                                                
                                                                                
                                                                                
                                                                                
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                                              Sharing the classics since '07    

"Packet Tracer simulation software can be used to teach complex networking concepts and to supplement classroom equipment. With PT4.1, instructors and students can design, build, configure, and troubleshoot networks using virtual equipment. PT4.1 provides a simulation and visualization environment with continuous real-time updates of underlying network logic and activity. It provides a common environment for instructors to demonstrate technologies and configurations, making it extremely useful for lectures, group and individual labs, homework and competitions. Students use PT4.1 to explore concepts, conduct experiments and test their understanding."

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Plain english, it's a program that will simulate a virtual network in the program, and it goes into pretty good detail setting it up, cause you have to set up IP addresses and subnets and all that good stuff. Great for any aspiring network administrator, or anyone who wants to experiment with it.