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GNS3 exists for Windows, Linux and Mac, and can be downloaded from https://www.gns3.com/. You must create an account in order to download GNS3 for free.

You should follow the recommendations pertaining to the hardware configuration of your system. The minimal configuration is made up of a two-core processor, 4 GB of RAM and 1 GB of hard disk space for installation.

Only a few tests can be carried out with this configuration, due to lack of resources. The more powerful the system configuration, the more new routers, switches and other virtual servers can be added, and the larger the scale of the tests that can be conducted.

GNS3 uses well-known software programs from the systems and network sphere as components, some of which are required, including WinPcap, Wireshark, Dynamips, VPCS, and other optional programs such as SolarwindsResponse and Virtviewer.