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As the enormous use of internet increases day by day so as security concern is also raise day by day over
the internet. In this paper we discuss the network security and its related threats and also study the types of
protocols and few issues related to protocols in computer networks. We also simulate the design of 5 node
wired network scenario, its packet drop rate analysis through TCP protocol using NS2 as a simulator.
Analyzed the performance of 5-node network when the packet is drop down by graphical method also
called as Xgraph when rate parameter is in mb and also analyzed the performance of same network by
changing the value of rate parameter at same time so no packets would drop down at same time and also
analyzed the performance by Xgraph method.