is an open source network simulator with which you can experience connections between routers or switches.
After installing the GNS3
application, you can start creating your own project by adding the objects you need, adjusting the attributes of the object to suit your needs, the application supports multiple types of routers and switches, such as Cisco CCNA, CCNP, CCIP , CCSP, CCVP and CCIE, Juniper JNCIA, JNCIS or JNCIE.
Also, if you created a faulty connection, GNS3
displays a warning message to correct your mistake, and you can rest assured that the project you are doing can be applied to real devices without any problems.
In conclusion, GNS3
through the features and objects made available will help you test a particular network topology you've built or study for a Cisco Certification Exam.Documentation / Demo