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What Are The Advantages And Disadvantages Of Network Simulators

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Chapter 4 Simulation & Experiment
4.1 Network Simulators “According to dictionary, Simulation can be defined as ―reproduction of essential features of something as an aid to study or training.” In simple words, this process is called where we can build one model of math called simulated in order to solve the problem of the system. In order to simulate the ad hoc network Networks or so-called MANET There are many simulation available networks such as QUALNET , OPENET and NS2 etc[25]. First part of this section, we will take the overview of all such networks with their usage, advantages and disadvantages of using it. For our simulation, we have to finalize the one out of them depending on their availability and problem compatibility …show more content…

NS2 is nothing but the discrete event simulator for the researches in the area of networking. As it provides support research for wired and wireless networks and simulation using IP, UDP and TCP and CBR patterns of communication [26]. Network simulation consists of (NS) mainly of two parts, the first part is called (NS) means network simulator and the other part is called (NAM) means network animator. we use the first part which called (NS) to simulate all kinds of protocols such as IP, which is commonly used on wired and wireless networks And also we use second part which called (NAM) it is used to visualize the simulated networks in actual contact patterns.NAM supports the wired network simulation fully as compared to wireless simulation which is possible only partially with the NAM. NS2 is the recent version 2 of the network simulator which was developed and published by the one the university in the Berkeley city called as University of California. But after that, VINT project as well. Initially network simulator was developed only for the wired networks; recently Carnegie Mellon University in 1999, extended the working and simulation of the NS2 for the wireless ad hoc networks means MANET as well. There also some other features of the ns-2 which increases our interests of using the ns2 simulator for the simulation of our network applications such as:
• The …show more content…

• Choice in which the routing is done along multiple paths because its provides the number of routing protocols .
NS2 is developed as the completely object oriented network simulator by Using the technologies such as OTcL and CPP. The class hierarchy which is presented in the OTcL and C++ interpreted is very much supported by the network simulator in which there is one to one mapping in between compile hierarchy and the class in the interpreted hierarchy .
NS2 contain two types of programming languages used that we have discussed above, such as C ++ and OTcl :
• Use C++ : is used for the speed efficiency in the simulation of the networks.
• Use OTcl: the reason is that OTcl language is suitable for the programs and configurations which are demanding for the fast and frequent network changes.
Thus such tool is very flexible for the useNs-2 as it also allows user to existing protocols for their application simulations as well as to develop their network protocol in order to extend the functionality of the tool. Network simulator also helps for the performance measurement from the trace analysis functionality which is very important for the research purposes in order to measure the efficiency of particular application or particular routing protocol. NS2 is open source and free software tool which is widely available for downloads from the Internet. It was initially developed for the UNIX systems

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