Network simulation is without a doubt one of the most predominant evaluation methodologies in the area of computer networks. It is widely used for the development of new communication architectures and network protocols. This chapter is to introduce various concept of simulation of different types of data networks. Among all the concurrent simulators at present, the supremacy of NS2 as the network simulator is also stated here. A brief description of QoS parameters along with their importance is narrated afterwards. The main motivation behind this thesis is highlighted in the foregoing section. Finally the organization of this dissertation is discussed in brief.
