GNS3

GNS3 is software that simulates complicated networks as closely as possible to how real networks operate, all without the need for specific network gear such as routers and switches. It can also be used to test features or configurations before deploying them to real devices. 

Build, design, and test your network in a risk-free virtual environment, and get advice from the largest networking community. Whether you're studying for your first networking exam or establishing a state-wide telecommunications network, GNS3 makes it simple to design and build networks of any size without the use of hardware. And the greatest part? It's free!

Why should you use GNS3?

Real-time network simulation for pre-deployment testing that does not require network hardware. 
Run the operating system that simulates the actual behavior of network devices. 

Test over 20 different network providers in a risk-free virtual environment. 
Easily run and test numerous hardware providers without the requirement for hardware. 

Generate dynamic network maps for troubleshooting and proof of concept (POC) testing. 
Test your networks before you build them to shorten the time it takes to get a production network up and operating. 

Connect GNS3 to a real network. 
Use your existing hardware to expand your current lab by connecting your app topologies directly to it. 

GNS3 software offers customized topologies and labs for network certification training, eliminating the requirement for a home lab.

Note: Requires Wireshark.

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