Introduction%20Lecture%201

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IntroductionLecture 1

• CNET204 Web Design with FrontPage
• Winter 2009
• Centennial College

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Lecture 1 Outline

• What is the Internet?
• Where did it come from?
• What are we going to discuss in CNET204?
• Internet
• Physical Infrastructure

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The Ever-changing Internet

• Different colors based on IP address
• http//research.lumeta.com/ches/map

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What is the Internet?

• WWW
• Video conferencing
• ftp
• telnet
• Email
• Instant messaging

A communication infrastructure Usefulness is in
exchanging information
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On-line interactive communities... will be
communities not of common location, but of common
interest.... the total number of users...will be
large enough to support extensive general purpose
computers. All of these will be interconnected
by telecommunications channels... to constitute
a labile network of networks--ever changing in
both content and configuration. J. C. R.
Licklider
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Where Did It Come From?

• It was invented by Madonna. JUST KIDDING!
• Early 1960s - DARPA (ARPA in 1960s) project
  headed by Licklider
• Late 1960s - ARPANET research on packet
  switching by Roberts
• First node installed by BBN at UCLA in September
  1969
• 1969 - Four host computers (UCLA, SRI, UCSB,
  University of Utah)

Get more info at http//www.isoc.org/internet/his
tory/ http//www.packet.cc/internet.html
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ARPANET, 1980
http//mappa.mundi.net/maps/maps_001/
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History of the Internet

• 1969 - RFCs begun by S. Crocker
  (http//rfc.sunsite.dk/)
• 1972 - Email by Ray Tomlinson Larry Roberts
• 1970s - TCP by Vint Cerf Bob Kahn
• Evolved into TCP/IP, and UDP
• 1980s Hardware Explosion (LANs, PCs, and
  workstations)
• 1983 Ethernet by Metcalfe
• DNS Distributed and scalable mechanism for
  resolving host names into IP addresses
• UC Berkeley implements TCP/IP into Unix BSD
• 1985 Internet used by researchers and
  developers

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History of the Internet

• Tim Berners-Lee at CERN in 1989
• Proposal for WWW in 1990
• First web page on November 13, 1990
• Hypertext - Text that contains links to other
  text.
• Ted Nelsons Xanadu
• Vannevar Bushs Memex
• (http//www.theatlantic.com/unbound/flashbks/comp
  uter/bushf.htm)
• W3C

Get more info at http//www.isoc.org/internet/his
tory/
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What will CNET204 cover?

• Simple to sophisticated web page creation
• Use of Adobe CS4
• Dreamweaver HTML and CSS editor
• PhotoShop for images, pictures and layering
• Flash for animations
• Tables
• Layout Tables
• Cascading Style Sheets (CSS)
• Web Project done individually

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Course Details

• Grading
• 30 4 assignments
• 30 Midterm
• 40 Final Project
• All work must be posted to studentweb by the due
  date

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Lab Assignments

• Assignment 1
• Home Page
• Assignment 2
• Page with Image maps
• Assignment 3
• Tables
• Layout Tables
• Assignment 4
• Forms
• CSS

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Administrative Details

• Contacting staff
• bwarne_at_centennialcollege.ca 8230
• http//facultyweb.centennialcollege.ca/bwarne
• http//elms.centennialcollege.ca
• Communicate through mycentennial
• Grading/testing online
• Students Rights and Responsibilties

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Communicating Via the Internet

• Internet has made the information of the world
  as available as information on a LAN
• www.whatismyip.com
• www.wc3.org
• tracert
• ipconfig.exe
• www.visualroute.com

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Performance Latency and Bandwidth

• Latency ping command
• How long minimum communication takes in seconds
  (s)
• Round trip vs. single trip
• More difficult to overcome than bandwidth
• Bandwidth - http//pcpitstop.com
• Number of bits per time unit usually seconds
  (bps)

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Ethernet

• Bob Metcalfe at Xerox PARC
• Used for local area networks (LANs)
• Physically near one another
• 200 computers within 100 meters
• Broadcast medium
• Single wire connects all computers
• Each computer has unique 48-bit MAC address
• All computers constantly listen
• Carrier Sense, Multiple Access with Collision
  Detect
• Sender waits until wire unused before sending
• If hears collision, stops, waits random time,
  retransmits