overview of data communications and networking
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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. - PowerPoint PPT PresentationTRANSCRIPT
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Overview of Overview of Data Communications Data Communications
and and NetworkingNetworking
PART IPART I
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Overview
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Chapters
Chapter 1 Introduction
Chapter 2 Network Models
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Chapter 1
Introduction
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1.1 Data Communication
Components
Data Representation
Direction of Data Flow
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Figure 1.1 Five components of data communication
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Figure 1.2 Simplex
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Figure 1.3 Half-duplex
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Figure 1.4 Full-duplex
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1.2 Networks
Distributed Processing
Network Criteria
Physical Structures
Categories of Networks
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Figure 1.5 Point-to-point connection
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Figure 1.6 Multipoint connection
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Figure 1.7 Categories of topology
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Figure 1.8 Fully connected mesh topology (for five devices)
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Figure 1.9 Star topology
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Figure 1.10 Bus topology
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Figure 1.11 Ring topology
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Figure 1.12 Categories of networks
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Figure 1.13 LAN
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Figure 1.13 LAN (Continued)
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Figure 1.14 MAN
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Figure 1.15 WAN
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1.3 The Internet1.3 The Internet
A Brief History
The Internet Today
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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
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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
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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
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the original ARPANET design
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Growth of the ARPANET. (a) Dec. 1969. (b) July 1970.(c) March 1971. (d) April 1972. (e) Sept. 1972.
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The NSFNET backbone in 1988.
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Figure 1.16 Internet today
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1.4 Protocols and Standards1.4 Protocols and Standards
Protocols
Standards
Standards Organizations
Internet Standards
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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/Or
ganizations/Internet_Backbone/