Network simulation is one of the methods to program and model the behaviour of any network including TCP data transmission. The different between simulation and its real application is the transmission accuracy as the simulator will only give the estimation result based on the ideal case that uses mathematical formula. The software tools used in this assignment is Network Simulator 2 (NS2). It is basically a process of generating a simulation result of a TCP scenario in a simple network topology. Hence, several advantages of this tools are to understand the basic components of TCP transmission, to observe the behaviour of TCP sessions as well as to get used to the NS2 tools. The simple scenario described above can be illustrated in the figure 1. The topology consists of three sources, one gateway and one receiver which the gateway has a TCP packets with droptail queue mechanism.
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