The first data transmition

The first data exchange over this new network occurred between computers at UCLA and Stanford Research Institute. On their first attempt to log into Stanford's computer by typing "log win", UCLA researchers crashed their computer when they typed the letter 'g'.

Four computers were the first connected in the original ARPAnet. They were located in the respective computer research labs of UCLA (Honeywell DDP 516 computer), Stanford Research Institute (SDS-940 computer), UC Santa Barbara (IBM 360/75), and the University of Utah (DEC PDP-10). As the network expanded, different models of computers were connected, creating compatibility problems. The solution rested in a better set of protocols called TCP/IP (Transmission Control Protocol/Internet Protocol) designed in 1982.

To send a message on the network, a computer breaks its data into IP (Internet Protocol) packets, like individually addressed digital envelopes. TCP (Transmission Control Protocol) makes sure the packets are delivered from client to server and reassembled in the right order.

Under ARPAnet several major innovations occurred: email (or electronic mail), the ability to send simple messages to another person across the network (1971); telnet, a remote connection service for controlling a computer (1972); and file transfer protocol (FTP), which allows information to be sent from one computer to another in bulk (1973).

As non-military uses for the network increased, more and more people had access, and it was no longer safe for military purposes. As a result, MILnet, a military only network, was started in 1983. Internet Protocol software was soon being placed on every type of computer, and universities and research groups also began using in-house networks known as Local Area Networks or LAN's. These in-house networks then started using Internet Protocol software so one LAN could connect with other LAN's.

In 1986, one LAN branched out to form a new competing network, called NSFnet (National Science Foundation Network). NSFnet first linked together the five national supercomputer centers, then every major university, and it started to replace the slower ARPAnet (which was finally shutdown in 1990). NSFnet formed the backbone of what we call the Internet today.

"The Internet's pace of adoption eclipses all other technologies that preceded it. Radio was in existence 38 years before 50 million people tuned in; TV took 13 years to reach that benchmark. Sixteen years after the first PC kit came out, 50 million people were using one. Once it was opened to the general public, the Internet crossed that line in four years." - quote from the U.S. Department report "The Emerging Digital Economy".