GNS3 is a powerful free software through which you can create your own virtual networks without needing any kind of hardware. Just think about the circuitry through which you will connect all the elements to try out your new virtual environment risk-free.
In GNS3, there is an interface that lets you develop each project without too much hassle. If you have some previous knowledge in this field, it won't be long before you get the hang of how the program works. By adding each part of the structure, you will manage to set up a network that meets the function you were looking for. In fact, before finishing the project, you can always test that everything is working correctly.
Something very convenient in GNS3 is that the program lets you design networks of any size. However complex the structure might look, the tool will provide you with the necessary features to develop each project without spending more time than necessary on it. In fact, you can also create dynamic network maps for solving problems and proofs of concept.
GNS3 is a really easy program to manage that works both for students who are taking their first steps in this field and for professionals in the field. Without needing to rely on hardware or home labs, you can start your own network development in a matter of hours.
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It's simple and flexible to use