# GNS3

Skill · IT Infrastructure and Networking

Canonical page: https://career.thegoodapps.co/skills/gns3

GNS3 (Graphical Network Simulator-3) is a free, open-source software tool that lets network engineers design, configure, and test complex network topologies by emulating real routers, switches, and firewalls (including Cisco IOS images and virtual machines). It's widely used by IT professionals studying for certifications like CCNA/CCNP and by network administrators to test configurations before deploying them in production. GNS3 combines a graphical drag-and-drop interface with a backend emulation engine to closely mimic real hardware behavior.

Related skills: [Cisco Packet Tracer](https://career.thegoodapps.co/skills/cisco-packet-tracer), [EVE-NG](https://career.thegoodapps.co/skills/eve-ng)

## Open roles requiring GNS3 (0)

None of the roles we have read name this skill yet. A large share of the visible corpus has not been parsed for skills, so this is at least as likely to be our backlog as the market's verdict.