Internet Pioneers Joseph Carl Robnett Licklider : developed the idea of a universal network while working at DARPA Robert Taylor : succeeded Licklider at DARPA Information Processing Techniques Office (IPTO) He also was a big supporter of time-sharing vs. batch processing computers . Video
What Did Licklider Want?
The Department of Defense operated computers or computer-like equipment for many different functions:
Missiles and satellites, Strategic Air command
Battleship control systems
Army field operations
Licklider wanted all of them to be able to communicate with each other
More Internet Pioneers L-R: Vint Cerf , Robert Kahn , Len Kleinrock , and Larry Roberts – Team members from Bolt, Beranek and Newman (BBN) and the Lincoln Labs at MIT and later at UCLA who created the first IMP and connected the first two nodes.
TCP/IP Routers and Packet Switches
Local Area Networks (LANs)
Fiber Optics (big Internet pipes)
UNIX with TCP/IP kernel
Integration of TCP/IP into all computers
Hypertext Markup Language (HTML)
Multimedia standards and protocols
TCP = transfer control protocol
IP = Internet protocol
Pioneered by Vint Cerf and Bob Kahn
Three Types of Switching
video on the difference between circuit and packet switching
What does a packet look like?
Advantages of Packet Switching over Message Switching
Packets all have the same size
No waiting for entire message to end before sending next message
More options in routing
Pioneers of Packet Switching
Baran was concerned about creating a network that could survive a nuclear attack. Davies was looking for a more efficient network that would work with time-sharing systems. Davies came up with the name; both given credit for the concept.
Developed by Robert Metcalfe and others at Xerox PARC in 1973-75
Connects computers locally and allows them to connect to the Internet from one shared node
Ethernet and the Internet
Ethernet made it possible for offices to network computers locally (via Local Area Networks or LANs) without connecting them directly to large, mainframe computers
Wide Area Networks (WANs) did the same for organizations with multiple sites
The Internet was adapted for connecting LANs and WANs as well as larger computers
Fiber Optics and the Internet Backbone
In order to speed up first voice and later data communications on the public switched network, the US and other countries moved from satellite and copper cable networks to fiber optics networks
Sergey Brin on TED
Undersea Fiber Optic Cables
Fiber moves closer to home
Fiber to the curb (FTTC)
Fiber to the home (FTTH)
Pioneers of the Web: 1980
HTML developed for scientists at The CERN complex in Geneva
What is HTML?
Hypertext Markup Language
Predominant standard for creating web pages and web sites
These pages can be accessed by standard “web browsers”
Permits the combination of text, graphics, and other media on a single page and links to other pages
Uniform Resource Locators
A system for locating uniform resource names (URNs) on the Internet
For example, the URL http://www.indiana.edu identifies a resource that is obtainable via HTTP (hypertext transfer protocol) from a network called www.indiana.edu
World Wide Web
Berners-Lee and Cailliau proposed in March 1989 the creation of what was to become the World Wide Web.
They went on to create the World Wide Web Consortium (W3C) to make technical decisions about it.
The Rise of Microcomputers and Hacker Culture
1976 Apple I computer sold to computer hobbyists
Paul Allen and Bill Gates create a BASIC language compiler for microcomputers
1981 IBM PC begins to compete in the microcomputer market
What motivated the PC revolution?
Desire for the dispersion of computing power to “the people”
Avoiding dependence on large, centralized computing systems owned by large organizations
Some Interesting Historical Facts
Although Apple led the way to mass consumer markets, it was overtaken by PCs and PC-clones in the 1980s
Microsoft was the main beneficiary of the rise of PC clones
The switch from narrow band to broadband networks enabled the rise of web-based firms like Google and Facebook
Good Questions in the Textbook
How has the historical development of the Internet shaped its contemporary characteristics?
Is TCP/IP a radical communication technology?
How important is the do-it-yourself, or hacker, ethos for making sense of the Internet’s development?
Assess the impact of the World Wide Web and the graphical browser on the diffusion of the Internet.