NS2

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The Network Simulator 2 (NS2) is a tool used by network researchers to simulate and evaluate the behaviour of computer networks. It is an open-source program developed by the Lawrence Berkeley National Laboratory and is part of a larger network simulator family which includes NS1, NS2, and NS3. This article will outline the application field and working principle of NS2.

NS2 is used by network engineers, researchers, and students to evaluate, debug, and validate the behaviour and performance of wired and wireless communication networks. The simulation platform is capable of simulating large, complex networks without the need for a large amount of hardware. The NS2 simulator can help save researchers time and money on testing and development by allowing them to create and analyse an entire network virtually.

NS2 was designed to simulate computer networks over a wide range of topologies and protcols including those of the Transport Control Protocol/Internet Protocol (TCP/IP), IEEE 802.11, and ZigBee/IEEE 802.15.4. NS2\'s user-friendly graphical user interface (GUI) allows for the simulation of various network topologies, protocols, and functions. The simulator\'s powerful scripting language supports the extension of the software and provides the user with the ability to create their own simulation scenarios and vary their network parameters.

The NS2 simulator works by simulating network elements such as routers, switches, and hosts. It utilizes discrete event simulator (DES) for simulating the network behaviour and performance of various elements that are part of the network. These elements can be linked together to simulate different communication topologies and protocols. The simulator also allows for the generation of various types of traffic on the network and the measurement of various parameters such as delay, throughput, jitter, and packet loss. Additionally, NS2 supports the addition of other devices such as wireless LAN hubs, firewalls, and intrusion-detection systems.

In addition to the DES that it uses to simulate network behaviour, the NS2 simulator also includes a graphical user interface (GUI). This allows the user to create, modify, and simulate scenarios in an interactive environment. Furthermore, the GUI allows users to graphically view the results of their simulations.

NS2 offers a variety of features that can help researchers evaluate network behaviour and performance in a variety of scenarios. Furthermore, it is a free and open-source product that makes it a widely used tool in the academic and research circles. NS2 simulations can be used to compare different routing protocols and the behaviour of different network elements. Additionally, the NS2 simulator can be used to evaluate the performance of network protocols under different traffic conditions.

In conclusion, the Network Simulator 2 (NS2) is an open-source program that allows researchers, engineers, and students to simulate and evaluate the behaviour and performance of computer networks. It uses a discrete event simulator for simulating networks and allows for the generation of various types of traffic. Additionally, NS2 has a user-friendly GUI that allows the simulation and graphical viewing of the results of simulations. NS2 offers a variety of features for evaluating network behaviour and performance in various scenarios, making it a widely used tool in the academic and research circles.

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