Network simulation is a driven test system outlined particularly for inquires about in network correspondence systems. Since its beginning in 1989, network simulation has constantly increased gigantic enthusiasm from industry, the scholarly community, and government. Having been under consistent examination and upgrade for a considerable length of time, network simulation now contains modules for various system segments, for example, steering, transport layer convention, and application. To explore arrange execution, scientists can just utilize a simple to-utilize scripting dialect to design a system, and watch comes about produced by network simulation. Without a doubt, network simulation has turned into the most broadly utilized open source arrange test system, and a standout amongst the most generally utilized system test systems. Lamentably, most research needs reproduction modules which are past the extent of the inherent network simulation modules. Consolidating these modules into network simulation requires significant comprehension of network simulation design. As of now, most network simulation tenderfoots depend on online instructional exercises. The greater part of the accessible data principally discloses how to design a system and gather comes about, yet does exclude adequate data for building extra modules in network simulation. By this book it will be productive to the exploration researchers and understudies.