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Lecture 5

CP102 Lecture Notes - Lecture 5: Darpa, Vint Cerf, Email Client

Computer Science
Course Code
Mark Petrick

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Lecture 5
Chapter 3 Using the Internet: Making the Most of the Web’s Resources
Chapter Topics
The origin of the Internet
The Internet and how it works
Communicating and collaborating through the Internet
Web entertainment
Conducting business over the Internet:
Accessing the Web: Web browsers
Getting around the Web: URLs, hyperlinks, and other tools
Searching the Web effectively
Internet: network of networks
Origin of the Internet
Internet is a network of networks connecting billions of computers globally
Developed while U.S. was in midst of Cold War with Soviet Union
Department of defense (US) making it so that everything is interconnected
Created to respond to two concerns:
Establishing a secure form of military communications
Budget for dept. of defense 2010 $680 billion ( in comparison to the budget of Canada
$276 billion)
Creating a means by which all computers could communicate
Open protocols - it is a difficult thing
Evolved from Advanced Research Projects Agency Network (ARPANET)
Vinton Cerf
Robert Kahn
Inventors of the internet and worked on protocols
First communication occurred in 1969
World Wide Web is subset of the Internet
Common protocols enable computers to talk to each other
Special links enable navigation
The Web vs. the Internet
!! The WWW is NOT the INTERNET !!
World Wide Web = Web Pages
INTERNET = All services
(includes: Web, Email, IM, etc…)
The Web is part of the Internet, distinguished by
Common communication protocols
Navigation links
1989: Web invented by Tim Berners-Lee (he created HTML)
1993: Mosaic browser released
1994: Netscape Navigator marked beginning of the Web’s major growth
1997: Internet access was global

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In the early days
The Internet and How It Works
Computer connected to the Internet acts in one of two ways:
Client is computer that asks for data
Server receives the request and returns data to the client
Client / Server Network
Communicating and Collaborating Through the Internet
Different ways to communicate
Instant messaging
Group communications
Social networking
Web and video logs
Podcasts and Webcasts
Web 2.0 - application combine functionality of multiple apps, emphasis on sharing and collaboration
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