Out of these varieties of simulators, it is difficult for one to select network simulator based on the requirement for a specific job. There are many simulators available such as Ns-2, Ns-3, OMNeT++, NetSim, J-SIM, REAL, OPNET, OMNEST, QualNet, GloMoSim, TOSSIM, DRMSim, TraNS, NTCUns etc. These days a wide range of network simulators are accessible, some of them are committed to the wired network, some of them to the wireless network or some dedicated to both type of networks. Hence various simulators act as the prototype of the real system. Practically hardware setup of network topologies is very costly and strenuous to modify often.
Simulation software plays a vital role in real-world implementation.
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