the internet and the world wide web
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The Internet and the World Wide Web. What is the Internet?. A Short History The Internet Today How the Internet Works Basic Internet Applications Specialized Apps. What is the Internet? and Not. On-Line Providers. Dialup Access to Providers’ Computer Systems. Gateways.

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what is the internet
What is the Internet?
  • A Short History
  • The Internet Today
  • How the Internet Works
  • Basic Internet Applications
  • Specialized Apps
slide3
What is the Internet? and Not

On-Line Providers

Dialup Access to Providers’ Computer Systems

Gateways

7 Million Computers Seamlessly Integrated via 60,000 Largely Private Networks

Gateways

UUCP Nets, FidoNets, BitNets, X400,...

a short history of the internet
A Short History of the Internet
  • 1964—Paul Baran (RAND Corp.) proposes a loosely-coupled, robust network
  • 1969—ARPANET formed as a four-node network (UCLA, SRI, UCSB, and U of Utah-Salt Lake City)
  • 1974—Kahn and Cerf head TCP/IP project
  • 1980—CSNET added to ARPANET
  • 1986—NSF forms NSFNET
a short history of the internet1
A Short History of the Internet
  • 1987—NSFNET “backbone” expands the Internet worldwide
  • 1989—CERN launches WWW project
  • 1990—ARPANET decommissioned
  • 1992—Internet Society formed
  • 1993—NCSA Mosaic GUI for WWW
  • 1995—NSFNET decomissioned
the internet today
The Internet Today

Connectivity Worldwide

the internet today1
The Internet Today

124 Million

Internet Hosts

124 Million

Internet Hosts

hosts

hosts

NOW

Historical

Values

Historical

Values

Projected Values

Projected

Values

how is the internet used
How is the Internet Used?

IRC

DNS

1%

APPLICATIONS

2%

Gopher

  • FTP is the top application (based on packets transferred)
  • WWW is a close second

3%

Telnet

3%

Mail

1,075 Other

5%

Services

29%

NewsNet

9%

WWW

20%

FileTransfer

28%

how is the internet used1
How is the Internet Used?
  • information sharing
  • global collaboration
  • distance education
  • software distribution
  • scientific research
  • product development
  • public service
  • marketing & sales
  • customer support
  • professional development
  • entertainment

some of it’s many uses...

how the internet works
How the Internet Works
  • Internet is a packet-switched network
  • DATAGRAMs are packets of data that also contain addressing information
  • TCP/IP are protocols (standards) for how datagrams are packaged and delivered
  • IP address is a number that signifies the address of an Internet host
  • Domain names are pseudonyms for IP addresses
how the internet works1
How the Internet Works
  • Gateways and Routers transmit datagrams across the Internet
  • Client/Server applications add functionality to the Internet
basic internet applications
Basic Internet Applications
  • ELECTRONIC MAIL (EMAIL)asynchronous communications
    • mail client
    • mail server
basic internet applications1
Basic Internet Applications
  • REMOTE LOGINS (TELNET)—synchronous 2-way communications
    • local host
    • remote host
basic internet applications2
Basic Internet Applications
  • FILE TRANSFER PROTOCOL (FTP)—exchanging data and programs between systems
    • anonymous ftp
specialized internet apps
Specialized Internet Apps
  • ARCHIE—searching anonymous ftp servers for files by name
  • GOPHER—organizing data and connections as hypertext
  • CHAT—“live” group conversations
  • MUDs & MOOs—group interactions in a virtual environment
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