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Overview of Data Communications and Networking

PART I. Overview of Data Communications and Networking. Overview. Chapters. Chapter 1 Introduction. Chapter 2 Network Models. Chapter 1. Introduction. 1.1 Data Communication. Components Data Representation Direction of Data Flow.

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Overview of Data Communications and Networking

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  1. PART I Overview of Data Communications and Networking

  2. Overview

  3. Chapters Chapter 1 Introduction Chapter 2 Network Models

  4. Chapter 1 Introduction

  5. 1.1 Data Communication Components Data Representation Direction of Data Flow

  6. Figure 1.1Five components of data communication

  7. Figure 1.2Simplex

  8. Figure 1.3Half-duplex

  9. Figure 1.4Full-duplex

  10. 1.2 Networks Distributed Processing Network Criteria Physical Structures Categories of Networks

  11. Figure 1.5Point-to-point connection

  12. Figure 1.6Multipoint connection

  13. Figure 1.7Categories of topology

  14. Figure 1.8Fully connected mesh topology (for five devices)

  15. Figure 1.9Star topology

  16. Figure 1.10Bus topology

  17. Figure 1.11Ring topology

  18. Figure 1.12Categories of networks

  19. Figure 1.13LAN

  20. Figure 1.13 LAN (Continued)

  21. Figure 1.14 MAN

  22. Figure 1.15WAN

  23. 1.3 The Internet A Brief History The Internet Today

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

  25. Chronology of Internet Evolution continued (W. Stallings) • 1986 NSFnet backbone created • 1990 ARPANET retired • 1991 Gopher introduced • 1991 WWW invented • 1992 Mosaic introduced • 1995 Internet backbone privatized • 1996 OC-3 (155 Mbps) backbone built

  26. 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

  27. the original ARPANET design

  28. Growth of the ARPANET. (a) Dec. 1969. (b) July 1970.(c) March 1971. (d) April 1972. (e) Sept. 1972.

  29. The NSFNET backbone in 1988.

  30. Figure 1.16Internet today

  31. 1.4 Protocols and Standards Protocols Standards Standards Organizations Internet Standards

  32. Websites • http://www.isoc.org/internet/history/ • http://www.zakon.org/robert/internet/timeline/ • http://www.nsrc.org/codes/bymap/ntlgy/ (Internetology: 1993-97, by continents, by date) • http://www.w3.org/History.html (Web history) • http://en.wikipedia.org/wiki/Internet_backbone • http://www.nthelp.com/maps.htm (backbone maps) • http://directory.google.com/Top/Computers/Internet/Organizations/Internet_Backbone/

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