McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Overview of Data Communications and Networking PART I

McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Overview

McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Chapters Chapter 1 Introduction Chapter 2 Network Models

McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Chapter 1 Introduction

McGraw-Hill©The McGraw-Hill Companies, Inc., Data Communication Components Data Representation Direction of Data Flow

McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 1.1 Five components of data communication

McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 1.2 Simplex

McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 1.3 Half-duplex

McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 1.4 Full-duplex

McGraw-Hill©The McGraw-Hill Companies, Inc., Networks Distributed Processing Network Criteria Physical Structures Categories of Networks

McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 1.5 Point-to-point connection

McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 1.6 Multipoint connection

McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 1.7 Categories of topology

McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 1.8 Fully connected mesh topology (for five devices)

McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 1.9 Star topology

McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 1.10 Bus topology

McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 1.11 Ring topology

McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 1.12 Categories of networks

McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 1.13 LAN

McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 1.13 LAN (Continued)

McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 1.14 MAN

McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 1.15 WAN

McGraw-Hill©The McGraw-Hill Companies, Inc., The Internet A Brief History The Internet Today

McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Chronology of Internet Evolution (W. Stallings) 1996ARPA packet-switching experiment 1969First ARPANET nodes operational 1972Distributed invented 1973Non US computer linked to ARPANET 1975ARPANET transitioned to Defense Communications Agency 1980TCP/IP experiment began 1981New host added every twenty days 1983TCP/IP switchover complete

McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Chronology of Internet Evolution continued (W. Stallings) 1986NSFnet backbone created 1990ARPANET retired 1991Gopher introduced 1991WWW invented 1992Mosaic introduced 1995Internet backbone privatized 1996OC-3 (155 Mbps) backbone built

McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Growth of the Internet Exponential growth in the 1990s (Web technology is a major factor) More than 30-million computers were attached to the Internet in 1998 Doubling the size every 9 to 12 month in the 1990s

McGraw-Hill©The McGraw-Hill Companies, Inc., 2004

McGraw-Hill©The McGraw-Hill Companies, Inc., 2004

McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 the original ARPANET design

McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Growth of the ARPANET. (a) Dec (b) July (c) March (d) April (e) Sept

McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 The NSFNET backbone in 1988.

McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 1.16 Internet today

McGraw-Hill©The McGraw-Hill Companies, Inc., Protocols and Standards Protocols Standards Standards Organizations Internet Standards

McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Websites (Internetology: , by continents, by date) (Web history) (backbone maps) tions/Internet_Backbone/ tions/Internet_Backbone/