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IntroductionIntroductionLecture 1Lecture 1
CNET204 – Web Design with FrontPageCNET204 – Web Design with FrontPage
Winter 2009Winter 2009
Centennial CollegeCentennial College
Lecture 1 OutlineLecture 1 Outline
What is the Internet?What is the Internet? Where did it come from?Where did it come from? What are we going to discuss in What are we going to discuss in
CNET204?CNET204? InternetInternet Physical InfrastructurePhysical Infrastructure
The Ever-changing InternetThe Ever-changing Internet
Different colors based on IP addressDifferent colors based on IP addresshttp://research.lumeta.com/ches/maphttp://research.lumeta.com/ches/map
What is the Internet?What is the Internet?
WWWWWW Video conferencingVideo conferencing ftpftp telnettelnet EmailEmail Instant messagingInstant messaging ……
A communication infrastructureA communication infrastructure
Usefulness is in exchanging informationUsefulness is in exchanging information
“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
Where Did It Come From?Where Did It Come From? It was invented by Madonna. It was invented by Madonna. JUST KIDDING!JUST KIDDING! Early 1960’s - DARPA (ARPA in 1960’s) project
headed by Licklider Late 1960’s - 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/history/http://www.packet.cc/internet.html
ARPANET, 1980ARPANET, 1980
http://mappa.mundi.net/maps/maps_001/
History of the InternetHistory of the Internet 1969 - RFCs begun by S. Crocker
(http://rfc.sunsite.dk/) 1972 - Email by Ray Tomlinson & Larry Roberts 1970’s - TCP by Vint Cerf & Bob Kahn
Evolved into TCP/IP, and UDP 1980s – Hardware Explosion (LANs, PCs, and 1980s – Hardware Explosion (LANs, PCs, and
workstations)workstations) 1983 – Ethernet by Metcalfe1983 – Ethernet by Metcalfe
DNS – Distributed and scalable mechanism for DNS – Distributed and scalable mechanism for resolving host names into IP addressesresolving host names into IP addresses
UC Berkeley implements TCP/IP into Unix BSDUC Berkeley implements TCP/IP into Unix BSD 1985 – Internet used by researchers and 1985 – Internet used by researchers and
developersdevelopers
History of the InternetHistory of the Internet
Tim Berners-Lee at CERN in 1989Tim Berners-Lee at CERN in 1989 Proposal for WWW in 1990Proposal for WWW in 1990 First web page on November 13, 1990First web page on November 13, 1990
Hypertext - Text that contains links to other text. Ted Nelson’s Xanadu Vannevar Bush’s Memex
(http://www.theatlantic.com/unbound/flashbks/computer/bushf.htm)
W3C
Get more info at:http://www.isoc.org/internet/history/
What will CNET204 cover?What will CNET204 cover?
Simple to sophisticated web page creationSimple to sophisticated web page creation Use of Adobe CS4Use of Adobe CS4
Dreamweaver HTML and CSS editorDreamweaver HTML and CSS editor PhotoShop for images, pictures and layeringPhotoShop for images, pictures and layering Flash for animationsFlash for animations
TablesTables Layout TablesLayout Tables Cascading Style Sheets (CSS)Cascading Style Sheets (CSS) Web Project done individuallyWeb Project done individually
Course DetailsCourse Details
GradingGrading 30% 4 assignments30% 4 assignments 30% Midterm30% Midterm 40% Final Project40% Final Project All work must be posted to studentweb by the All work must be posted to studentweb by the
due datedue date
Lab AssignmentsLab Assignments
Assignment #1Assignment #1 Home PageHome Page
Assignment #2Assignment #2 Page with Image mapsPage with Image maps
Assignment #3Assignment #3 TablesTables Layout TablesLayout Tables
Assignment #4Assignment #4 FormsForms CSSCSS
Administrative DetailsAdministrative Details
Contacting staffContacting staff [email protected] [email protected] 8230 http://facultyweb.centennialcollege.ca/bwarne http://facultyweb.centennialcollege.ca/bwarne http://elms.centennialcollege.ca http://elms.centennialcollege.ca
Communicate through mycentennialCommunicate through mycentennial Grading/testing onlineGrading/testing online Students Rights and ResponsibiltiesStudents Rights and Responsibilties
Communicating Via the InternetCommunicating 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
Latency – ping commandLatency – ping command How long minimum communication takes in seconds How long minimum communication takes in seconds
(s)(s) Round trip vs. single tripRound trip vs. single trip More difficult to overcome than bandwidthMore difficult to overcome than bandwidth
Bandwidth - http://pcpitstop.com Bandwidth - http://pcpitstop.com Number of bits per time unit usually seconds (bps)Number of bits per time unit usually seconds (bps)
Performance: Latency and Performance: Latency and BandwidthBandwidth
bandwidth
latency
link
EthernetEthernet Bob Metcalfe at Xerox PARC Used for local area networks (LANs)Used for local area networks (LANs)
Physically near one anotherPhysically near one another 200 computers within 100 meters200 computers within 100 meters
Broadcast mediumBroadcast medium Single wire connects all computersSingle wire connects all computers
• Each computer has unique 48-bit MAC addressEach computer has unique 48-bit MAC address All computers constantly listenAll computers constantly listen
““Carrier Sense, Multiple Access with Collision Carrier Sense, Multiple Access with Collision Detect”Detect” Sender waits until wire unused before sendingSender waits until wire unused before sending If hears collision, stops, waits random time, retransmitsIf hears collision, stops, waits random time, retransmits
