GNS3 For Windows

GNS3 is software that simulates complex networks while performing as closely as possible to how real networks perform, all without the need for specialized network hardware such as routers and switches. It can also be used to experiment with features or to check configurations that need to be deployed on real devices later.

Build, design and test your network in a risk-free virtual environment and access the largest online community to help. Whether you're preparing for your first networking exam or building a statewide telecommunications network, GNS3 provides an easy way to design and build networks of any size without hardware. Best of all it's free!