GNS3

GNS3 (Graphical Network Simulator-3) is a software tool that allows network professionals and students to design, test, and troubleshoot computer networks in a virtual environment. It mimics real-world networking devices like routers and switches, enabling users to create complex network setups without physical hardware. This helps in learning network concepts, practicing configurations, and preparing for certifications safely and cost-effectively. GNS3 provides a visual interface to build and experiment with network topologies, making it a valuable resource for education and practical network development.