NS2

NS2, or Network Simulator 2, is a software tool used by researchers and network engineers to create virtual models of computer networks. It allows them to simulate and analyze how different network protocols, devices, and configurations perform without needing physical hardware. This helps in understanding network behavior, testing new ideas, and improving existing systems in a controlled, cost-effective environment. Essentially, NS2 acts like a digital laboratory for studying network performance and troubleshooting potential issues before real-world deployment.