GNS3

A graphical network simulator to design and configure virtual networks

Build, Design and Test your network in a risk-free virtual environment and access the largest networking community to help. Whether you are studying for your first networking exam or building out a state-wide telecommunications network, GNS3 offers an easy way to design and build networks of any size without the need for hardware. And the best part is it's free!

Minimum Requirements
OS	Windows 7 (64 bit) and later, Mavericks (10.9) and later, Any Linux Distro - Debian/Ubuntu are provided and supported
Processor	2 or more Logical cores - AMD-V / RVI Series or Intel VT-X / EPT - virtualization extensions present and enabled in the BIOS. More resources allows for larger simulation
Memory	4 GB RAM
Storage	1 GB available space (Windows Installation is < 200MB
Additional Notes	More storage is needed for OS and Device Images.

Why should you use GNS3?

Real-time network simulation for pre-deployment testing without the need for network hardware

Run the OS that emulates real behavior of network hardware

Test 20+ different network vendors in risk-free virtual environment

Quickly run and test multiple hardware vendors without the need for hardware

Create dynamic network maps for troubleshooting and proof of concept (POC) testing

Test your networks before you build them to reduce the time it takes to get a production network up and running

Connect GNS3 to any real network

Leverage your existing hardware and expand your current lab by connecting your GNS3 topologies directly to it

Customized topologies and labs within GNS3 for network certification training

GNS3 is the best study tool for aspiring network professional seeking their certifications, without the need for a home lab.