Introduction to Network Simulator NS2

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Although this concept is typical in practice, NS2 models packets differently. A typical communication system consists of applications, transport layer agents, and a low-level network.

An application models user demand to transmit data. Taking user demand as an input, a sending transport layer agent creates packets and forwards them to the associated receiving transport layer agent through a low- level network. Having discussed the details of low-level networks in Chaps. Also, the details of applications will be presented in Chap.

As a transport control protocol, Transmission Control Protocol TCP bridges an application to a low-level network, controls network congestion, and provides relia- bility to an end-to-end connection. This chapter discusses the details of TCP agents. Section Sections Finally, the chapter summary is provided in Sect. Operating on top of a transport layer agent, an application models user demand for data transmission.

‎Introduction to Network Simulator NS2 on Apple Books

A user is assumed to create bursts of data payload or application packets. These payload bursts are transformed into transport layer packets which are then forwarded to a transport layer receiving agent. Applications can be classified into traffic generator and simulated application. A traffic generator creates user demand based on a predefined schedule.


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A simulated application, on the other hand, creates the demand as if the application is running. NS2 classifies communication networks into three main categories. First, wired networks are characterized by wired communication links. Chapter 7 shows a simple form of the wired links called SimpleLinks which can be used to connect regular Node discussed in Chap.

Related Work

So far, we have explained the details of the basic components of NS2 including their functionalities, internal mechanisms, and configuration methods. In this chapter, we demonstrate how new NS2 modules are created, configured, and incorporated through two following examples. One is an Automatic Repeat reQuest ARQ protocol, which is a mechanism to improve transmission reliability of a communi- cation link by means of packet retransmission.

Another is a packet scheduler which arranges the transmission sequence of packets from multiple incoming data flows. A typical NS2 simulation consists of three main steps: 1 simulation design, 2 configuring and running simulation, and 3 postsimulation processing see Fig.

The former two aspects were discussed extensively in the previous chapters, while the last aspect will be discussed in this chapter. This chapter discusses the details of three main NS2 helper classes. In Sect. Finally, the chapter summary is given in Sect. This appendix covers the programming languages,which are essential for developing NS2 simulation programs. As one of the main OOP concepts, polymorphism refers to the ability to invoke the same function with different implementation under different context.

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An introduction to network simulator NS2

This concept should be simple to understand, since it occurs in our daily life. Similar to an array, a link list is a data structure which can contain a collection of data items [16]. Link lists are implemented using pointers. Therefore, programmers do not need to specify the size of the link list. The memory is allocated to the link list at runtime. Print ISBN Electronic ISBN Autoren: Teerawat Issariyakul Ekram Hossain. Buch kartoniert. Here is a welcome learning aid for anyone who needs to go beyond the basics in network simulation.

Network Simulations Using NS2

It provides all the information required to install NS2, run simple examples, modify existing NS2 modules, and incorporate new modules into the softwar … weiterlesen. Geschenk per Mail versenden.

Introduction to Network Simulator NS2

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Springer US 3. Beschreibung Introduction to Network Simulator NS2 is a primer providing materials for NS2 beginners, whether students, professors, or researchers for understanding the architecture of Network Simulator 2 NS2 and for incorporating simulation modules into NS2. The authors discuss the simulation architecture and the key components of NS2 including simulation-related objects, network objects, packet-related objects, and helper objects. The NS2 modules included within are nodes, links, SimpleLink objects, packets, agents, and applications.

Further, the book covers three helper modules: timers, random number generators, and error models. Also included are chapters on summary of debugging, variable and packet tracing, result compilation, and examples for extending NS2. Inhaltsverzeichnis Simulation of Computer Networks. Pressestimmen From the reviews of the second edition: "This book on ns-2 can be used as a reference by researchers, as well as by undergraduate and postgraduate students.

It will be useful for courses related to computer networks.

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