The Evaluation of the Behavior of Computer Networks by Ns Simulator and the Effect of Queuing Systems in the Performance of Especial Networks

2 Abstract: The current study aimed to evaluated the computer networks behavior by NS simulator version 2 (NS-2) and implementation of the network by this simulator and the investigation of the effect of queuing systems in the network performance. Thus, various queuing systems such as CBQ, SFQ, DRR, FQ, RED and Drop Tail are implemented by the purpose simulator. In an elementary scenario are compared with each other and throughput of the network is calculated for each of them. It can be said that the purpose of this paper is depicting the effect of queuing disciplines in the network and selecting a good system and as the selection of the type of optimized queue discipline depends upon the network topology, the results are dedicated for special topology of the network in this paper and is not generalized.