Definitions for "Network Simulator "
Ns is a discrete event simulator targeted at networking research. It provides substantial support for simulation of TCP, routing, and multicast protocols over wired and wireless networks. It includes an optional network animator .
Network simulator is supposed to be a framework, which aids both protocol developers, and network administers. Protocol developers can develop and test new protocols, and Network administers can construct a "virtual network" before setting up one.
a boxed software product derived from the previously self-published Boson NetSim from Boson Software