ARPANET
This introduction is here for now and will be changed later on when i understand more about it. The internet has been here for as long as i can remember and is a very important part to everybody on the planet every single day of their lives! The internet has changed many lives and wont be going anywere anytime soon |
ARPANETSummerization: The precursor to the Internet, ARPANET was a large wide-area network created by the United States Defense Advanced Research Project Agency (ARPA). Established in 1969, ARPANET served as a testbed for new networking technologies, linking many universities and research centers. The first two nodes that formed the ARPANET were UCLA and the Stanford Research Institute, followed shortly thereafter by the University of Utah.
A climate of pure research surrounded the entire history of the ARPANET. The Advanced Research Projects Agency was formed with an emphasis towards research, and thus was not oriented only to a military product. The formation of this agency was part of the U.S. reaction to the then Soviet Union's launch of Sputnik in 1957. (ARPA draft, III-6). ARPA was assigned to research how to utilize their investment in computers via Command and Control Research (CCR). Dr. J.C.R. Licklider was chosen to head this effort. Licklider came to ARPA from Bolt, Beranek and Newman, (BBN) in Cambridge, MA in October 1962. (ARPA draft, III-6)
From Licklider's arrival, the department's contracts were shifted from independent corporations towards "the best academic computer centers" (ARPA draft, III-7). The then current computing mode was via batch processing (you know, input via stacks of punched cards, output: results, or lack of them, made known one or more days later.). Licklider saw improvements could be made in CCR only via work on advancing the current state of computing technology. He particularly wanted to move forward into the age of interactive computing, and the current contractors were not moving in that direction. In an Interview, Licklider told the interviewee that SDC "was based on batch processing, and while I was interested in a new way of doing things, they [SDC] were studying how to make improvements in the ways things were done already." (An Interview with J.C.R. Licklider conducted by William Aspray and Arthur Norberg on October 28, 1988 Cambridge, Mass. CBI Univ of Minn., Madison) The office "developed into a far-reaching basic research program in advanced technology." (ARPA draft III-7) Licklider's Office was renamed Information Processing Techniques (IPT or IPTO) to reflect that change.
The Completion report states that "Prophetically, Licklider nicknamed the group of computer specialists he gathered the 'Intergalactic Network'." ARPA draft, III-7) Before work on the ARPANET began, the very idea of the network was planted by the creation of the Information Processing Techniques Office of ARPA. Robert Taylor, Licklider's successor at the IPTO, remembers Lick's interest in interconnecting communities:
"Lick was among the first to perceive the spirit of community created among the users of the first time-sharing systems... In pointing out the community phenomena created, in part, by the sharing of resources in one timesharing system, Lick made it easy to think about interconnecting the communities, the interconnection of interactive, on-line communities of people, ..." (ARPA draft, III-21)
The "spirit of community" was related to Lick's interest in having computers help people communicate with other people (Licklider, Licklider, and Robert Taylor, "The Computer as a Communication Device") Licklider's vision of an "intergalactic network" connecting people represented an important conceptional shift in computer science. This vision was also an important beginning to the ARPANET. After the ARPANET was up and running, the computer scientists using it realized that assisting human communication was the most fundamental advance that the ARPANET made possible. (Cite Larry Roberts)
As early as 1963, a common question asked of the IPTO directors by the ARPA directors about IPTO projects was "Why don't we rely on the computer industry to do that?", or ocassionally more strongly, "We should not support that effort because ABC (read, "computer industry") will do it - if it's worth doing!" (ARPA draft, III-23) This question leads to an important point - this ARPA research was different from what the computer industry had in mind to do - or was likely to undertake. Since Licklider's creation of the IPTO, the work supported by ARPA/IPTO continued his explicit emphasis on communications. The Completion Report explains, "The ARPA theme is that the promise offered by the computer as a communication medium between people, dwarfs into relative insignificance the historical beginnings of the computer as an arithmetic engine." (ARPA draft, III-24)
The Completion Report goes on to differentiate ARPA from the computer industry: "The computer industry, in the main, still thinks of the computer as an arithmetic engine. Their heritage is reflected even in current designs of their communication systems.' They have an economic and psychological commitment to the arithmetic engine model, and it can die only slowly..." (ARPA draft, III-24)
The Completion Report further analyzes this problem by tracing it back to the nation's institutions: "...furthermore, it is a view that is still reinforced by most of the nation's computer science programs. Even universities, or at least parts of them, are held in the grasp of the arithmetic engine concept...." (ARPA draft, III-24) Since Licklider's creation of the IPTO, the work supported by ARPA/IPTO continued the explicit communications emphasis. Thus history has witnessed the research and development which had led to the concrete existence of first the ARPANET, and later the Internet. Without the commitment that existed via this support, such a development might never have happened. One of ARPA's criterion for supporting research was such that it had to be of such a level to offer an order of magnitude of development. As most research and development is not immediately profitable, there has to be some kind of organization which helps to set higher goals than just in developing what will be immediately profitable. What is really strange is that computer networking is an immensely profitable field right now - only it is 25 years later.
Others have understood the communications promise of computers. For example, in RFC 1336, David Clark is quoted, "It is not proper to think of networks as connecting computers. Rather, they connect people using computers to mediate. The great success of the internet is not technical, but in human impact. Electronic mail may not be a wonderful advance in Computer Science, but it is a whole new way for people to communicate. The continued growth of the Internet is a technical challenge to all of us, but we must never loose sight of where we came from, the great change we have worked on the larger computer community, and the great potential we have for future change." Various research outside of ARPA had been done by Paul Baron, Thomas Marill and others. [This history is covered well in the article "From ARPANET to USENET" by Ronda Hauben..ref] This led Lawrence Roberts and other IPTO staff to formally introduce the topic of networking computers of differing types (incompatible hardware and software) together in order to share resources to the early 1967 meeting of ARPA's Primary Investigators (PI).
In the spring of 1967 at the University of Michigan, ARPA held its yearly meeting of the "principle investigators" from each of its university and other contractors. (ARPA draft, III-25) Results from the previous year's research was summarized and future research was discussed, either introduced by ARPA or the various researchers present at the meetings. Networking was one of the topics brought up at this meeting. (ARPA draft, III-25) The Completion Report continues the story: "At the meeting it was agreed that work could begin on the conventions to be used for exchanging messages between any pair of computers in the proposed network, and also on consideration of the kinds of communications lines and data sets to be used. In particular, it was decided that the inter-host communication 'protocol' would include conventions for character and block transmission, error checking and retransmission, and computer and user identification. Frank Westervelt, then of the University of Michigan, was picked to write a position paper on these areas of communication, an ad hoc 'Communication Group' was selected from among the institutions represented, and a meeting of the group scheduled." (ARPA draft, III-26)
In order to develop this network of varied computers, two main problems had to be solved: " 1. To construct a 'subnetwork' consisting of telephone circuits and switching nodes whose reliability, delay characteristics, capacity, and cost would facilitate resource sharing among computers on the network. 2. To understand , design, and implement the protocols and procedures within the operating systems of each connected computer, in order to allow the use of the new subnetwork by the computers in sharing resources." (ARPA not draft, II-8) After one draft and additional work on this communications position paper report, a two-day meeting was scheduled in early October 1967 by ARPA to "discuss the protocol paper and specifications for the Interface Message Processor (IMP)." The IMP was the decided upon method of connecting the participants computers (hosts) to each other via phone lines. This standardized the network which the hosts connected to. Now, only the connection of the hosts to the network would depend on vendor type, etc. ARPA had picked 19 possible participants in what was now known as the "ARPA Network", rather than the previously vague descriptions.
After the time of the 1967 PI Meeting, various computer scientists who were ARPA contractors were busy thinking about various aspects which would be relevant to the planning and development of the ARPANET. Part of that work was a document outlining a beginning design for the IMP network. This specification would lead to the ability to a put out a competitive procurement for the design of the IMP subnetwork. "At the end of 1967 ARPA initiated a small contract with the Stanford Research Institute for the development of specifications for the necessary communications system. Elmer Shapiro was to be the key person on this study. Published in the final version in December of 1968 was a 71-page SRI report entitled "A Study of COmputer Network Design Parameters", an early version in early 1968 served as the first draft of the IMP specification...In February or March a memo written by Shapiro and revised by Kleinrock entitled "Functional Description of the IMP" was circulated. After the first draft by Shapiro, it is believed that Glenn Culler wrote a second draft, and Robert and Wessler of ARPA wrote the final version of the IMP specification. In any case, by the first of March, 1968, IPT was able to report to the Director of ARPA that specifications for the IMP were essentially complete, and that they would be discussed at the upcoming PI meeting with the goal of issuing a Request for Quotation shortly thereafter. The network was discussed at the PI meeting and by June 1968, the ARPANET procurement officially started."
(ARPA draft, III-32) ARPA's Program Plan for the ARPANET was titled "Resource Sharing Computer Networks". It was submitted June 3, 1968, and approved by the Director June 21, 1968. The Completion Report explains that the Program Plan was, "an interesting document. The stated objectives of the program were to develop experience in interconnection computers and to improve and increase computer research productivity through resource sharing. Technical needs in scientific and military environments were cited as justification for the program objectives. Relevant prior work was described. It was noted that the computer research centers supported or partially supported by IPT provided a unique testbed for computer networking experiments, as well as providing immediate benefits to the centers and valuable research results to the military. The network planning that had gone on was described, the need for a network information center was noted, and the network design was sketched. A five year schedule for network procurement, construction, operation, and transfer out of ARPA was presented. (It was noteworthy that IPT had initially had in mind eventual transfer of the operational network to a common carrier.) Finally a several-million-dollar, several-year budget was stated." (ARPA draft, III-35)
The Defense Supply Service - Washington (DSS-W) agreed to be a procurement agent for ARPA. At the end of July the Request for Quotation for network IMPs was mailed to 140 potential bidders who had expressed interest in receiving it. Approximately 100 people from 51 companies attended a subsequent bidders' conference. Twelve proposals were actually received by DSS_W comprising 6.6 edge-feet of paper and presenting an awesome evaluation task for IPT, which more normally awards contracts on a sole source basis. Attempting to evaluate the proposals "strictly by the book", an ARPA-appointed evaluation committee retired to Monterey, California, to carry out their task. ARPA was pleasantly surprised that several of the respondents believed that they could construct a network which performed as much as a factor of five better than the delay constraint given in the RFQ..." (ARPA draft, III-35) ARPA developed a program plan, which developed into a set of specifications. These specifications were connected to a competitive Request for Quotation to find an organization which would design and build the subnetwork between the IMPs.
BBN won the contract to develop the IMP-to-IMP subnetwork. However the second technical problem still remained to be solved. The protocol to allow the hosts to communicate with each other over the subnetwork had to be developed. This work was left "for host sites to work out among themselves." (ARPA draft, III-67) This meant that both the hardware and software necessary to connect the hosts to the IMP subnetwork had to be developed. ARPA assigned this duty to the initial designated ARPANET sites. As each site had a different type of computer to connect, they individually were the best informed designers for their personal setups. In addition the sites needed to develop the hardware and software necessary to utilize the other hosts on the network. (ARPA draft, III-39) ARPA's assigning of responsibilities makes the academic computer science community become an active part of the ARPANET development team. (Interview with Alex McKenize, Nov, 1 1993)
Steve Crocker associates the placement of the initial ARPANET sites at research institutions to the fact that the ARPANET was ground-breaking research. He wrote in a message responding to my questions on the COM-PRIV mailing list: "During the initial development of the Arpanet, there was simply a limit as to how far ahead anyone could see and manage. The IMPs were placed in cooperative ARPA R&D sites with the hope that these research sites would figure out how to exploit this new communication medium." (Crocker, 1993A) The first sites of the ARPANET were picked to provide either network support services or unique resources. They were also picked as deemed technically able of developing the protocols necessary to make communications between the varied computers connected possible. The key services the first four sites provided were "UCLA - Network Measurement Center SRI - Network Information Center UCSB - Culler-Fried interactive mathematics UTAH - graphics (hidden line removal)" (Cerf, Vinton 1993) Steve Crocker also recounts that the reason for selecting these particular four sites was because they were "existing ARPA computer science research contractors." This was important because "the research community could be counted on to take some initiative."
The very first site to receive an IMP was UCLA. Professor Leonard Kleinrock of UCLA was involved with much of the early development of the ARPANET. His work consisted of understanding queueing theory and as such was one of the first computer scientists working on the ARPANET who was dealing with how to measure what was happening as the network would function. This made it natural to make sure that UCLA received the first node as it would be important to initiate the network from the site which would measure the networks activity. In order for the statistics to be correct and for analysis purposes - the first site had to be the measurement site. Sure enough UCLA was assigned to be the Network Measurement Center (NMC).
CSNETSummerization:The Computer Science Network (CSNET) helped introduce what was fast becoming the Internet to universities around the world, and laid the groundwork for development of the NSFNET.
In 1979, most U.S. universities weren't doing research with the Department of Defence and so weren't connected to the ARPANET, but were increasingly aware of the network's advantages and wanted to level the research playing field. With seed funding and support from Kent Curtis at the National Science Foundation, Larry Landweber at the University of Wisconsin-Madison put together a proposal to build a network to connect non-ARPANET computer science departments. The proposal made its way to Dave Farber for review, who gave it to one of his graduate students, Dave Crocker, who thought it was an interesting idea but, like others, worried about the university's lack of networking experience.
With the support of Vinton Cerf, DARPA, and others, the NSF awarded $5 million to the CSNET project in January, 1980. A team was assembled to manage the project -- Landweber, Farber, Peter Denning, Tony Hearn, and the NSF project manager Bill Kern. One of the immediate consequences of the award was the connection of three universities to the ARPANET that became the core of the CSNET -- Wisconsin-Madison, Purdue, and Delaware. In a foreshadowing of the NSFNET development, one of the conditions of the award was a key clause requiring the network to become self sufficient within five years.
CSNET played a central role in popularizing the Internet outside the ARPANET, eventually connecting more than 180 institutions and tens of thousands of new users, who in turn went on to further the awareness and spread of the growing network. One of the most important legacies of the CSNET was the introduction of the NSF to the Internet, which led directly to development of the NSFNET.
NSFNETA wide-area network developed under the auspices of the National Science Foundation (NSF). NSFnet replaced ARPANET as the main government network linking universities and research facilities. In 1995, however, the NSF dismantled NSFnet and replaced it with a commercial Internet backbone. At the same time, the NSF implemented a new backbone called very high-speed Backbone Network Service (vBNS), which serves as a testing ground for the next generation of Internet technologies.
(National Science Foundation NETwork) The network funded by the U.S. National Science Foundation, which linked five supercomputer sites across the country in the mid-1980s. Universities were also allowed to connect to it. In 1988, it was upgraded from its original 56 Kbps lines to T1 circuits. By the early 1990s, NSFnet was using a T3 backbone and served as the primary Internet backbone until 1995, when the Net became commercialized
CERNTim Berners-Lee is credited with having created the World Wide Web while he was a researcher at the European High-Energy Particle Physics lab, the Conseil Européenne pour la Recherche Nucleaire (CERN), in Geneva, Switzerland. A tool was needed to enable collaboration between physicists and other researchers in the high energy physics community.
Tim Berners-Lee wrote a proposal called HyperText and CERN and circulated his proposal for comments at CERN in 1989. The proposal was the solution to the technologies that would enable collaboration in the high energy physics community. Tim had a background in text processing, communications, and real-time software. The proposal was further refined by Tim Berners-Lee and Robert Cailliau in 1990.
Berners-Lee's proposal was an extension of the gopher idea but incorporated many new ideas and features. It was also inspired, in part, by the concept of hypertext and some of Ted Nelson's work on Xanadu. Three new technologies were incorporated into his proposal. Briefly, they were HTML (HyperText Markup Language) used to write the web documents, HTTP (HyperText Transfer Protocol) to transmit the pages, and a web browser client software program to receive and interpret data and display results. An important concept of his proposal included the fact that the client software program's user interface would be consistent across all types of computer platforms so that users could access information from many types of computers.
A line-mode user interface (named at CERN, the world wide web or www) was completed in late 1989. The interface was used on a minor network in March 1991. May 1991 was the first time that the information-sharing system using HTML, HTTP, and a client software program (www) was fully operational on the multiplatform computer network at the CERN laboratories in Switzerland.
All of the documents coded with HTML elements were stored on one main computer at CERN. This special type of computer was called a "web server" (by the physicists at CERN) because it "served-up" batches of cross-linked HTML documents. There was only one Web server located at CERN, but by the end of 1992 there were over 50 Web servers in the world. Many of these earliest Web servers were located at universities or other research centers. These servers were using line-mode interfaces. By June 1999 there were more than 720,000 public information servers. In April of 2001 there were over 24 million servers.
InterNICsummery:The domain name registration project that was formed by agreements between Network Solutions, the National Science Foundation, General Atomics and AT&T.
Though the term "InterNIC" is commonly used to describe Network Solutions' distribution of domain names, "InterNIC" is actually a generic concept for an integrated network information center developed by several companies, including Network Solutions, in conjunction with the United States Government. InterNIC is a registered service mark of the U.S. Department of Commerce.
As the early ARPANet grew, hosts were referred to by names, and a HOSTS.TXT file would be distributed from SRI International to each host on the network. As the network grew, this became cumbersome. A technical solution came in the form of the Domain Name System, created by Paul Mockapetris. The Defense Data Network Network Information Center (DDN-NIC) at SRI handled all registration services, including the Top Level Domains of .mil, .gov, .edu, .org, .net, .com and .us, root nameserver administration and Internet number assignments under a United States Department of Defense contract. In 1991 the Defense Information Systems Agency (DISA) awarded the administration and maintenance of DDN-NIC, which had been up until this point under the management of SRI for many years, to Government Systems, Inc. who subcontracted it to the small private-sector Network Solutions Inc.
Since at this point in history most of the growth on the Internet was coming from non-Military sources, it was decided that the Department of Defense would no longer fund registration services outside of the .mil TLD. In 1993 the U.S. National Science Foundation, after a competitive bidding process in 1992, created the InterNIC to manage the allocations of addresses and management of the address databases, and awarded the contract to three organizations. Registration Services would be provided by Network Solutions; Directory and Database Services would be provided by AT&T; and Information Services would be provided by General Atomics. Later, General Atomics was dropped after a contract review found their services not being up to the standards of its contract. General Atomics InterNIC functions were assumed by AT&T. AT&T discontinued their InterNIC services after their contract ran out.
INTERNETsummary:The Internet (or "The Net") is a computer network that connects computers worldwide. The Internet is made up of many smaller computer networks. These networks send and get messages using a standard Internet Protocol (IP). A protocol is like a language, that lets computers understand one another.
The Internet was created in the United States in 1969 by the "United States Department of Defense Advanced Research Projects Agency" (known as ARPA). The World Wide Web was created at CERN in Switzerland in the 1990s by a British (UK) man named Tim Berners-Lee. Today, people can pay a fee to access the Internet from Internet Service Providers. Some services on the Internet cost nothing to use. Sometimes the people who run these free services use advertising to make money from them. The alternative name, "Net" came from "inter(net)".
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