Theorize the Network Simulator (ns-2 tutorial)

Experiments using Network Simulator(NS2)

Introduction:

Network Simulator is a discrete event simulator targeted at networking research. Ns provides substantial support for simulation of TCP, routing, and multicast protocols over wired and wireless (local and satellite) networks.

Desing: ns is an object oriented simulator, written in C++, with an OTcl(MIT [Massachusetts Institute of Technology in Cambrige] Object Tcl) interpreter as a frontend.

History: Modified from REAL network simulator and then Developed through VINT project at UCB and then the NS1 and  NS2 came into existence.

Main Class: Simulator class

Tool Command Language(Tcl):

Need: The Network Simulator uses Tcl scripts to simulate the communication among the network by using set of protocols(which said to be as set of rules).

History: The Tcl programming language was created in the spring of 1988 by John Ousterhout while working at the University of California, Berkeley.

Commands	Equivalents
set	= (equal to)
$variable1	Shows the value of the variable1

           

Code refactoring

• Code refactoring is the process of changing a computer program's source code without modifying its external functional behavior in order to improve some of the nonfunctional attributes of the software.
• As in java Netbeans there was a option to refactor to change the nonfunctional attributes of the class such as,   1.Name of the class file, 2.Move or copy the class from one package to another