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Numerous state of the art simulation tools are available for network research. Among the available simulators, NS-2 is the widely used and highly recognized open source network
simulator. The simulation behavior of NS-2 is highly trusted within the research community. It is a dependable and realistic discrete event based simulator tool and proves to be
more practicable. It is primarily designed based on OSI model to support wired networks. CMU wireless extension of NS2 extensively supports wireless networks.
An unique opportunity to gain hands-on experience in NS2, the first of its kind in Chennai. This course brings the best NS2 training for Graduate and Post-Graduate Engineering students and Research Scholars specialized in wired and wireless networks (B.E /B.Tech /M.E /M.Tech /M.S /Ph.D). Syllabus can be customized according to requirements of the student.
ns (from network simulator) is a name for a series of discrete event network simulators, specifically ns-1, ns-2 and ns-3. All of them are discrete-event computer network simulators,
primarily used in research and teaching. ns-3 is free software, publicly available under the GNU GPLv2 license for research, development, and use.
The goal of the ns-3 project is to create an open simulation environment for computer networking research that will be preferred inside the research community:
It should be aligned with the simulation needs of modern networking research.
It should encourage community contribution, peer review, and validation of the software.
Since the process of creation of a network simulator that contains a sufficient number of high-quality validated, tested and maintained models requires a lot of work, ns-3 project spreads this workload over a large community of users and developers.
ns or the network simulator (also popularly called ns-2, in reference to its current generation) is a discrete event network simulator. It is popular in academia for its
extensibility (due to its open source model) and plentiful online documentation. ns is popularly used in the simulation of routing and multicast protocols, among others,
and is heavily used in ad-hoc networking research. ns supports an array of popular network protocols, offering simulation results for wired and wireless networks alike.
It can be also used as limited-functionality network emulator. ns is licensed for use under version 2 of the GNU General Public License.
ns was built in C++ and provides a simulation interface through OTcl, an object oriented dialect of Tcl. The user describes a network topology by writing OTcl scripts, and then
the main ns program simulates that topology with specified parameters. The NS2 makes use of flat earth model in which it assumes that the environment is flat without any elevations
or depressions. However the real world does have geographical features like valleys and mountains. NS2 fails to capture this model in it.
Many researchers have proposed the additions of new models to NS2. Shadowing Model in NS2 attempts to capture the shadow effect of signals in real life, but does that inaccurately. NS2's shadowing model does not consider correlations: a real shadowing effect has strong correlations between two locations that are close to each other. Shadow fading should be modeled as a two dimensional log-normal random process with exponentially decaying spatial correlations.
NS-3 software is free software and is distributed under the GNU GPL v2 license.
NS-3 separate the Network to 4 parts: 1.Node , 2.NetDevice , 3.Channel ,4.Application. The advantage of NS-3 is that we can write the script via C++ or Python. It is a discrete-event network simulator for Internet systems, and is free software, licensed under the GNU GPLv2 license, and is publicly available for research, development, and use.
NS-3 tool can be used to write some script and parameter to simulate the environment which we don't have. Such as Network , Wireless, LTE ...etc..
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