Beginnings of the Internet

How Computers Learned to Talk to Each Other


The Beginnings

n    When computers were developed in the 1950’s they did not talk to each other. This all changed in 1969.

n    APRANET was a large-area network created by the US Defense Advanced Research Project Agency (ARPA).

n    On Labor Day, 1969, the first message was sent via telephone lines from one computer at UCLA to another computer at Stanford.

n    This was the beginning of the internet.

Electronic Communication


  The computer that is sending the information


  The computer receiving the message


  The media that carries or transports the message (phone wire, coaxial cable, fiber or microwave)


  The rules that govern the transfer of data.


n  A network is a group of two or more computers linked together via communication devices.

n    Computers on a network are called nodes or clients.

n    Computers that allocate or distribute resources are called servers.

Development of the Internet

n   Although no one person can claim to have started the internet, the early origins can be traced back to that first message sent from UCLA to Stanford via the ARPANET.

n  Over the years, the internet has grown  from just a network to allow scientists to share information on military and scientific research.

Timeline information

n    1972 - email

n    1989, more than 100,000 host computers were attached to ARPANET

n    1990, ARPANET ceased to exist

n    The Inter-Net-Network became known as the Internet

n   1992 - World Wide Web came into being

n   1993 World’s first browser, Mosaic was released. Browsers provide a graphical interface for the Internet.


n    All brands and models of computers can work on the internet due to interpolarity.

n    Computers on the internet communicate with each other using a set of protocols called TCP/IP       

n   Transmission Control Protocol and Internet Protocol (TCP/IP)

n   Protocol is a standard format for trasmitting data.

How They Talk

n    TCP/IP allows two computers to connect and exchange information

n    A host computer allows you to access the information it contains.

n    By typing in a specific address, you are able to connect to the computer.

n   The TCP/IP takes over and establishes a connection to the other computer.

n   Similar to putting an address on a letter and having the Post Office deliver it to the right address.


n The Web vs. the Net

n History of Computers

n More keyboarding.