# ARPANET

Last updated

ARPANET
ARPANET logical map, March 1977
TypeData
Location United States
Protocols NCP, TCP/IP
Established1969;50 years ago
Closed1990
Commercial?No
Funding Defense Advanced Research Projects Agency (DARPA)

The Advanced Research Projects Agency Network (ARPANET) was an early packet-switching network and the first network to implement the TCP/IP protocol suite. Both technologies became the technical foundation of the Internet. The ARPANET was initially founded by the Advanced Research Projects Agency (ARPA) of the United States Department of Defense. [1] [2] [3] [4] [5]

The Internet protocol suite is the conceptual model and set of communications protocols used in the Internet and similar computer networks. It is commonly known as TCP/IP because the foundational protocols in the suite are the Transmission Control Protocol (TCP) and the Internet Protocol (IP). During its development, versions of it were known as the Department of Defense (DoD) model because the development of the networking method was funded by the United States Department of Defense through DARPA.

The Defense Advanced Research Projects Agency (DARPA) is an agency of the United States Department of Defense responsible for the development of emerging technologies for use by the military.

The United States Department of Defense is an executive branch department of the federal government charged with coordinating and supervising all agencies and functions of the government directly related to national security and the United States Armed Forces. The DoD is the largest employer in the world, with nearly 1.3 million active-duty service members as of 2016. More employees include over 826,000 National Guard and Reservists from the armed forces, and over 732,000 civilians bringing the total to over 2.8 million employees. Headquartered at the Pentagon in Arlington, Virginia, just outside Washington, D.C., the DoD's stated mission is to provide "the military forces needed to deter war and ensure our nation's security".

## Contents

The packet-switching methodology employed in the ARPANET was based on concepts and designs by Paul Baran, Donald Davies,Leonard Kleinrock, and Lawrence Roberts. [6] The TCP/IP communications protocols were developed for the ARPANET by Robert Kahn and Vint Cerf, and incorporated concepts from the French CYCLADES project directed by Louis Pouzin.

Paul Baran was a Polish-American engineer who was a pioneer in the development of computer networks. He was one of the two independent inventors of packet switching, which is today the dominant basis for data communications in computer networks worldwide, and went on to start several companies and develop other technologies that are an essential part of modern digital communication.

Donald Watts Davies, was a Welsh computer scientist who was employed at the UK National Physical Laboratory (NPL). In 1965 he developed the concept of packet switching, which is today the dominant basis for data communications in computer networks worldwide, and implemented it in the NPL network. This was independent of the work of Paul Baran in the United States who had a similar idea in the early 1960s. The ARPANET project, a precursor to the Internet, credited Davies for his influence.

Leonard Kleinrock is an American computer scientist. A professor at UCLA's Henry Samueli School of Engineering and Applied Science, he made several important contributions to the field of computer networking, in particular to the theoretical foundations of computer networking. He played an influential role in the development of the ARPANET, the precursor to the Internet, at UCLA.

As the network development progressed, protocols for internetworking were developed by which multiple separate networks could be joined into a network of networks. Access to the ARPANET was expanded in 1981, when the National Science Foundation (NSF) funded the Computer Science Network (CSNET). In 1982, the Internet protocol suite (TCP/IP) was introduced as the standard networking software stack in the ARPANET. In the early 1980s, the NSF funded the establishment of national supercomputing centers at several universities, and provided network access and network interconnectivity with the NSFNET project in 1986. The ARPANET project was formally decommissioned in 1990, after partnerships with the telecommunication industry paved the way of future commercialization of a new world-wide network, known as the Internet.

Internetworking is "the concept of interconnecting different types of networks to build a large, global network" such that any pair of connected hosts can exchange packets. To build an internetwork, the following are needed: A standardized scheme to address packets to any host on any participating network; a standardized protocol defining format and handling of transmitted packets; components interconnecting the participating networks by routing packets to their destinations based on standardized addresses.

The National Science Foundation (NSF) is a United States government agency that supports fundamental research and education in all the non-medical fields of science and engineering. Its medical counterpart is the National Institutes of Health. With an annual budget of about US\$7.8 billion, the NSF funds approximately 24% of all federally supported basic research conducted by the United States' colleges and universities. In some fields, such as mathematics, computer science, economics, and the social sciences, the NSF is the major source of federal backing.

The Computer Science Network (CSNET) was a computer network that began operation in 1981 in the United States. Its purpose was to extend networking benefits, for computer science departments at academic and research institutions that could not be directly connected to ARPANET, due to funding or authorization limitations. It played a significant role in spreading awareness of, and access to, national networking and was a major milestone on the path to development of the global Internet. CSNET was funded by the National Science Foundation for an initial three-year period from 1981 to 1984.

## History

Historically, voice and data communications were based on methods of circuit switching, as exemplified in the traditional telephone network, wherein each telephone call is allocated a dedicated, end to end, electronic connection between the two communicating stations. The connection is established by switching systems that connected multiple intermediate call legs between these systems for the duration of the call.

Circuit switching is a method of implementing a telecommunications network in which two network nodes establish a dedicated communications channel (circuit) through the network before the nodes may communicate. The circuit guarantees the full bandwidth of the channel and remains connected for the duration of the communication session. The circuit functions as if the nodes were physically connected as with an electrical circuit.

The traditional model of the circuit-switched telecommunication network was challenged in the early 1960s by Paul Baran at the RAND Corporation, who had been researching systems that could sustain operation during partial destruction, such as by nuclear war. He developed the theoretical model of distributed adaptive message block switching. [7] However, the telecommunication establishment rejected the development in favor of existing models. Donald Davies at the United Kingdom's National Physical Laboratory (NPL) independently arrived at a similar concept in 1965. [8] [9]

RAND Corporation is an American nonprofit global policy think tank created in 1948 by Douglas Aircraft Company to offer research and analysis to the United States Armed Forces. It is financed by the U.S. government and private endowment, corporations, universities and private individuals. The company has grown to assist other governments, international organizations, private companies and foundations, with a host of defense and non-defense issues, including healthcare. RAND aims for interdisciplinary and quantitative problem solving by translating theoretical concepts from formal economics and the physical sciences into novel applications in other areas, using applied science and operations research.

The National Physical Laboratory (NPL) is the national measurement standards laboratory for the United Kingdom, based at Bushy Park in Teddington, London, England. It comes under the management of the Department for Business, Energy and Industrial Strategy.

The earliest ideas for a computer network intended to allow general communications among computer users were formulated by computer scientist J. C. R. Licklider of Bolt, Beranek and Newman (BBN), in April 1963, in memoranda discussing the concept of the "Intergalactic Computer Network". Those ideas encompassed many of the features of the contemporary Internet. In October 1963, Licklider was appointed head of the Behavioral Sciences and Command and Control programs at the Defense Department's Advanced Research Projects Agency (ARPA). He convinced Ivan Sutherland and Bob Taylor that this network concept was very important and merited development, although Licklider left ARPA before any contracts were assigned for development. [10]

Computer science is the study of processes that interact with data and that can be represented as data in the form of programs. It enables the use of algorithms to manipulate, store, and communicate digital information. A computer scientist studies the theory of computation and the practice of designing software systems.

Joseph Carl Robnett Licklider, known simply as J. C. R. or "Lick", was an American psychologist and computer scientist who is considered one of the most important figures in computer science and general computing history.

Intergalactic Computer Network or Galactic Network (IGCN) was a computer networking concept similar to today's Internet.

Sutherland and Taylor continued their interest in creating the network, in part, to allow ARPA-sponsored researchers at various corporate and academic locales to utilize computers provided by ARPA, and, in part, to quickly distribute new software and other computer science results. [11] Taylor had three computer terminals in his office, each connected to separate computers, which ARPA was funding: one for the System Development Corporation (SDC) Q-32 in Santa Monica, one for Project Genie at the University of California, Berkeley, and another for Multics at the Massachusetts Institute of Technology. Taylor recalls the circumstance: "For each of these three terminals, I had three different sets of user commands. So, if I was talking online with someone at S.D.C., and I wanted to talk to someone I knew at Berkeley, or M.I.T., about this, I had to get up from the S.D.C. terminal, go over and log into the other terminal and get in touch with them. I said, "Oh Man!", it's obvious what to do: If you have these three terminals, there ought to be one terminal that goes anywhere you want to go. That idea is the ARPANET". [12]

Donald Davies' work caught the attention of ARPANET developers at a conference in Gatlinburg, Tennessee, in October 1967. [13] He gave the first public demonstration, having coined the term packet switching, on 5 August 1968 and incorporated it into the NPL network in England. [14] Elizabeth Feinler created the first Resource Handbook for ARPANET in 1969 which led to the development of the ARPANET directory. [15] The directory, built by Feinler and a team made it possible to navigate the ARPANET. [16] [17] The NPL network followed by the ARPANET were the first two networks in the world to use packet switching, [18] [19] and were themselves connected together in 1973. [20] [21]

### Creation

In February 1966, Bob Taylor successfully lobbied ARPA's Director Charles M. Herzfeld to fund a network project. Herzfeld redirected funds in the amount of one million dollars from a ballistic missile defense program to Taylor's budget. [22] Taylor hired Larry Roberts as a program manager in the ARPA Information Processing Techniques Office in January 1967 to work on the ARPANET. In April 1967, Roberts held a design session on technical standards. The initial standards for identification and authentication of users, transmission of characters, and error checking and retransmission procedures were discussed. At the meeting, Wesley Clark proposed minicomputers called Interface Message Processors (IMPs) should be used to interface to the network rather than the large mainframes that would be the nodes of the ARPANET. Roberts modified the ARPANET plan to incorporate Clark's suggestion. The plan was presented at the ACM Symposium in Gatlinburg, Tennessee, in October 1967. [23] [24] [25] [26] Donald Davies' work on packet switching and the NPL network, presented by a colleague (Roger Scantlebury), came to the attention of ARPANET developers at this conference. [27] [28] Larry Roberts at ARPA applied Davies' concept of packet switching for the ARPANET, [29] [30] and sought input from Paul Baran and Leonard Kleinrock. Building on his earlier work on queueing theory, Kleinrock modelled the performance of packet-switched networks, which underpinned the development of the ARPANET. [27] The NPL network was using line speeds of 768 kbit/s, and the proposed line speed for the ARPANET was upgraded from 2.4 kbit/s to 50 kbit/s. [31]

By mid-1968, Roberts had prepared a complete plan for the computer network and gave a report to Taylor on June 3, who approved it on June 21. After approval by ARPA, a Request for Quotation (RFQ) was issued for 140 potential bidders. Most computer science companies regarded the ARPA proposal as outlandish, and only twelve submitted bids to build a network; of the twelve, ARPA regarded only four as top-rank contractors. At year's end, ARPA considered only two contractors, and awarded the contract to build the network to Bolt, Beranek and Newman Inc. (BBN) on 7 April 1969. The initial, seven-person BBN team were much aided by the technical specificity of their response to the ARPA RFQ, and thus quickly produced the first working system. This team was led by Frank Heart and included Robert Kahn. The BBN-proposed network closely followed Roberts' ARPA plan: a network composed of small computers called Interface Message Processors (or IMPs), similar to the later concept of routers, that functioned as gateways interconnecting local resources. At each site, the IMPs performed store-and-forward packet switching functions, and were interconnected with leased lines via telecommunication data sets (modems), with initial data rates of 56 kbit/s. The host computers were connected to the IMPs via custom serial communication interfaces. The system, including the hardware and the packet switching software, was designed and installed in nine months. [24] [32] [26] The BBN team continued to interact with the NPL team. [33] [34]

The first-generation IMPs were built by BBN Technologies using a rugged computer version of the Honeywell DDP-516 computer, configured with 24 of expandable magnetic-core memory, and a 16-channel Direct Multiplex Control (DMC) direct memory access unit. [35] The DMC established custom interfaces with each of the host computers and modems. In addition to the front-panel lamps, the DDP-516 computer also features a special set of 24 indicator lamps showing the status of the IMP communication channels. Each IMP could support up to four local hosts, and could communicate with up to six remote IMPs via early Digital Signal 0 leased telephone lines. The network connected one computer in Utah with three in California. Later, the Department of Defense allowed the universities to join the network for sharing hardware and software resources.

### Debate on design goals

According to Stephen J. Lukasik, who as Deputy Director and Director of DARPA (1967–1974) was "the person who signed most of the checks for Arpanet's development":

The goal was to exploit new computer technologies to meet the needs of military command and control against nuclear threats, achieve survivable control of US nuclear forces, and improve military tactical and management decision making. [36]

The ARPANET incorporated distributed computation, and frequent re-computation, of routing tables. This increased the survivability of the network in the face of significant interruption. Automatic routing was technically challenging at the time. The ARPANET was designed to survive subordinate-network losses, since the principal reason was that the switching nodes and network links were unreliable, even without any nuclear attacks. Resource scarcity supported the creation of the ARPANET, according to Charles Herzfeld, ARPA Director (1965–1967):

The ARPANET was not started to create a Command and Control System that would survive a nuclear attack, as many now claim. To build such a system was, clearly, a major military need, but it was not ARPA's mission to do this; in fact, we would have been severely criticized had we tried. Rather, the ARPANET came out of our frustration that there were only a limited number of large, powerful research computers in the country, and that many research investigators, who should have access to them, were geographically separated from them. [37]

The ARPANET was operated by the military during the two decades of its existence, until 1990. [38] [39]

The Internet Society agrees with Herzfeld in a footnote in their online article, A Brief History of the Internet:

It was from the RAND study that the false rumor started, claiming that the ARPANET was somehow related to building a network resistant to nuclear war. This was never true of the ARPANET, but was an aspect of the earlier RAND study of secure communication. The later work on internetworking did emphasize robustness and survivability, including the capability to withstand losses of large portions of the underlying networks. [40]

Paul Baran, the first to build a theoretical model for communication using packet switching, conducted the RAND study referenced above. [7] Baran confirmed that though the ARPANET did not exactly share his project's goal, his work had greatly contributed to the development of the ARPANET. [41] Minutes taken by Elmer Shapiro of Stanford Research Institute at the ARPANET design meeting of 9–10 October 1967 indicate that a version of Baran's routing method and suggestion of using a fixed packet size was expected to be employed. [42]

The initial ARPANET consisted of four IMPs: [43]

The first successful message on the ARPANET was sent by UCLA student programmer Charley Kline, at 10:30 pm PST on 29 October 1969 (6:30 UTC on 30 October 1969), from Boelter Hall 3420. [44] Kline transmitted from the university's SDS Sigma 7 Host computer to the Stanford Research Institute's SDS 940 Host computer. The message text was the word login; on an earlier attempt the l and the o letters were transmitted, but the system then crashed. Hence, the literal first message over the ARPANET was lo. About an hour later, after the programmers repaired the code that caused the crash, the SDS Sigma 7 computer effected a full login. [45] The first permanent ARPANET link was established on 21 November 1969, between the IMP at UCLA and the IMP at the Stanford Research Institute. By 5 December 1969, the entire four-node network was established.

### Growth and evolution

In March 1970, the ARPANET reached the East Coast of the United States, when an IMP at BBN in Cambridge, Massachusetts was connected to the network. Thereafter, the ARPANET grew: 9 IMPs by June 1970 and 13 IMPs by December 1970, then 18 by September 1971 (when the network included 23 university and government hosts); 29 IMPs by August 1972, and 40 by September 1973. By June 1974, there were 46 IMPs, and in July 1975, the network numbered 57 IMPs. By 1981, the number was 213 host computers, with another host connecting approximately every twenty days. [43]

In 1973, a transatlantic satellite link connected the Norwegian Seismic Array (NORSAR) to the ARPANET, making Norway the first country outside the US to be connected to the network. At about the same time a terrestrial circuit added a London IMP. [46] This connectivity later evolved into the SATNET.

In 1975, the ARPANET was declared "operational". The Defense Communications Agency took control since ARPA was intended to fund advanced research. [43] At about this time, the first ARPANET encryption devices were deployed to support classified traffic.

In September 1984 work was completed on restructuring the ARPANET giving U.S. military sites their own Military Network (MILNET) for unclassified defense department communications. [47] [48] Controlled gateways connected the two networks. The combination was called the Defense Data Network (DDN). [49] Separating the civil and military networks reduced the 113-node ARPANET by 68 nodes. The MILNET later became the NIPRNet.

### Rules and etiquette

Because of its government funding, certain forms of traffic were discouraged or prohibited. A 1982 handbook on computing at MIT's AI Lab stated regarding network etiquette: [50]

It is considered illegal to use the ARPANet for anything which is not in direct support of Government business ... personal messages to other ARPANet subscribers (for example, to arrange a get-together or check and say a friendly hello) are generally not considered harmful ... Sending electronic mail over the ARPANet for commercial profit or political purposes is both anti-social and illegal. By sending such messages, you can offend many people, and it is possible to get MIT in serious trouble with the Government agencies which manage the ARPANet.

### Technology

Support for inter-IMP circuits of up to 230.4 kbit/s was added in 1970, although considerations of cost and IMP processing power meant this capability was not actively used.

1971 saw the start of the use of the non-ruggedized (and therefore significantly lighter) Honeywell 316 as an IMP. It could also be configured as a Terminal Interface Processor (TIP), which provided terminal server support for up to 63 ASCII serial terminals through a multi-line controller in place of one of the hosts. [51] The 316 featured a greater degree of integration than the 516, which made it less expensive and easier to maintain. The 316 was configured with 40 kB of core memory for a TIP. The size of core memory was later increased, to 32 kB for the IMPs, and 56 kB for TIPs, in 1973.

In 1975, BBN introduced IMP software running on the Pluribus multi-processor. These appeared in a few sites. In 1981, BBN introduced IMP software running on its own C/30 processor product.

The original IMPs and TIPs were phased out as the ARPANET was shut down after the introduction of the NSFNet, but some IMPs remained in service as late as July 1990. [52] [53]

The ARPANET Completion Report, jointly published by BBN and ARPA, concludes that:

... it is somewhat fitting to end on the note that the ARPANET program has had a strong and direct feedback into the support and strength of computer science, from which the network, itself, sprang. [54]

In the wake of the decommissioning of the ARPANET on 28 February 1990, Vinton Cerf wrote the following lamentation, entitled "Requiem of the ARPANET": [55]

It was the first, and being first, was best,

but now we lay it down to ever rest.

Now pause with me a moment, shed some tears.
For auld lang syne, for love, for years and years

of faithful service, duty done, I weep.
Lay down thy packet, now, O friend, and sleep.

Senator Albert Gore, Jr. authored the High Performance Computing and Communication Act of 1991, commonly referred to as "The Gore Bill", after hearing the 1988 concept for a National Research Network submitted to Congress by a group chaired by Leonard Kleinrock. The bill was passed on 9 December 1991 and led to the National Information Infrastructure (NII) which Al Gore called the information superhighway .

The ARPANET project was honored with two IEEE Milestones, both dedicated in 2009. [56] [57]

## Software and protocols

The starting point for host-to-host communication on the ARPANET in 1969 was the 1822 protocol, which defined the transmission of messages to an IMP. [58] The message format was designed to work unambiguously with a broad range of computer architectures. An 1822 message essentially consisted of a message type, a numeric host address, and a data field. To send a data message to another host, the transmitting host formatted a data message containing the destination host's address and the data message being sent, and then transmitted the message through the 1822 hardware interface. The IMP then delivered the message to its destination address, either by delivering it to a locally connected host, or by delivering it to another IMP. When the message was ultimately delivered to the destination host, the receiving IMP would transmit a Ready for Next Message (RFNM) acknowledgement to the sending, host IMP.

Unlike modern Internet datagrams, the ARPANET was designed to reliably transmit 1822 messages, and to inform the host computer when it loses a message; the contemporary IP is unreliable, whereas the TCP is reliable. Nonetheless, the 1822 protocol proved inadequate for handling multiple connections among different applications residing in a host computer. This problem was addressed with the Network Control Program (NCP), which provided a standard method to establish reliable, flow-controlled, bidirectional communications links among different processes in different host computers. The NCP interface allowed application software to connect across the ARPANET by implementing higher-level communication protocols, an early example of the protocol layering concept incorporated to the OSI model. [59]

Networking research in the early 1970s by Robert E. Kahn and Vint Cerf let to the formulation of the Transmission Control Program, and its specification in December 1974 in RFC   675. Still a monolithic design at this time, the software was redesigned as a modular protocol stack. Originally referred to as IP/TCP, it was installed in the ARPANET for production use in January 1983. The development of a complete protocol suite by 1989, as outlined in RFC   1122 and RFC   1123, laid the foundation for growth of TCP/IP as a comprehensive protocol suite as the core component of the emerging Internet. [60]

### Network applications

NCP provided a standard set of network services that could be shared by several applications running on a single host computer. This led to the evolution of application protocols that operated, more or less, independently of the underlying network service, and permitted independent advances in the underlying protocols.

In 1971, Ray Tomlinson, of BBN sent the first network e-mail ( RFC   524, RFC   561). [61] By 1973, e-mail constituted 75% of the ARPANET traffic.

By 1973, the File Transfer Protocol (FTP) specification had been defined ( RFC   354) and implemented, enabling file transfers over the ARPANET.

The Network Voice Protocol (NVP) specifications were defined in 1977 ( RFC   741), and implemented. But, because of technical shortcomings, conference calls over the ARPANET never worked well; the contemporary Voice over Internet Protocol (packet voice) was decades away.

The Purdy Polynomial hash algorithm was developed for the ARPANET to protect passwords in 1971 at the request of Larry Roberts, head of ARPA at that time. It computed a polynomial of degree 224 + 17 modulo the 64-bit prime p = 264 − 59. The algorithm was later used by Digital Equipment Corporation (DEC) to hash passwords in the VMS operating system and is still being used for this purpose.

## ARPANET in a broader context

The ARPANET was related to many other research projects, which either influenced the ARPANET design, or which were ancillary projects or spun out of the ARPANET.

• Computer Networks: The Heralds of Resource Sharing , a 30-minute documentary film [62] featuring Fernando J. Corbató, J. C. R. Licklider, Lawrence G. Roberts, Robert Kahn, Frank Heart, William R. Sutherland, Richard W. Watson, John R. Pasta, Donald W. Davies, and economist, George W. Mitchell.
• "Scenario", an episode of the U.S. television sitcom Benson (season 6, episode 20—dated February 1985), was the first incidence of a popular TV show directly referencing the Internet or its progenitors. The show includes a scene in which the ARPANET is accessed. [63]
• There is an electronic music artist known as "Arpanet", Gerald Donald, one of the members of Drexciya. The artist's 2002 album Wireless Internet features commentary on the expansion of the internet via wireless communication, with songs such as NTT DoCoMo , dedicated to the mobile communications giant based in Japan.[ citation needed ]
• Thomas Pynchon mentions the ARPANET in his 2009 novel Inherent Vice , which is set in Los Angeles in 1970, and in his 2013 novel Bleeding Edge .[ citation needed ]
• The 1993 television series The X-Files featured the ARPANET in a season 5 episode, titled "Unusual Suspects". John Fitzgerald Byers offers to help Susan Modeski (known as Holly ... "just like the sugar") by hacking into the ARPANET to obtain sensitive information. [64]
• In the spy-drama television series The Americans , a Russian scientist defector offers access to ARPANET to the Russians in a plea to not be repatriated (Season 2 Episode 5 "The Deal"). Episode 7 of Season 2 is named 'ARPANET' and features Russian infiltration to bug the network.
• In the television series Person of Interest , main character Harold Finch hacked the ARPANET in 1980 using a homemade computer during his first efforts to build a prototype of the Machine. [65] [66] This corresponds with the real life virus that occurred in October of that year that temporarily halted ARPANET functions. [67] [68] The ARPANET hack was first discussed in the episode 2PiR (stylised 2${\displaystyle \pi }$R) where a computer science teacher called it the most famous hack in history and one that was never solved. Finch later mentioned it to Person of Interest Caleb Phipps and his role was first indicated when he showed knowledge that it was done by "a kid with a homemade computer" which Phipps, who had researched the hack, had never heard before.
• In the third season of the television series Halt and Catch Fire , the character Joe MacMillan explores the potential commercialization of the ARPANET.

## Related Research Articles

The history of the Internet has its origin in the efforts of wide area networking that originated in several computer science laboratories in the United States, United Kingdom, and France. The U.S. Department of Defense awarded contracts as early as the 1960s, including for the development of the ARPANET project, directed by Robert Taylor and managed by Lawrence Roberts. The first message was sent over the ARPANET in 1969 from computer science Professor Leonard Kleinrock's laboratory at University of California, Los Angeles (UCLA) to the second network node at Stanford Research Institute (SRI).

Packet switching is a method of grouping data that is transmitted over a digital network into packets. Packets are made of a header and a payload. Data in the header are used by networking hardware to direct the packet to its destination where the payload is extracted and used by application software. Packet switching is the primary basis for data communications in computer networks worldwide.

The end-to-end principle is a design framework in computer networking. In networks designed according to this principle, application-specific features reside in the communicating end nodes of the network, rather than in intermediary nodes, such as gateways and routers, that exist to establish the network.

BBN Technologies is an American research and development company, based next to Fresh Pond in Cambridge, Massachusetts, United States.

The Network Control Program (NCP) provided the middle layers of the protocol stack running on host computers of the ARPANET, the predecessor to the modern Internet.

Robert Elliot Kahn is an American electrical engineer, who, along with Vint Cerf, first proposed the Transmission Control Protocol (TCP) and the Internet Protocol (IP), the fundamental communication protocols at the heart of the Internet.

Robert William Taylor, known as Bob Taylor, was an American Internet pioneer, who led teams that made major contributions to the personal computer, and other related technologies. He was director of ARPA's Information Processing Techniques Office from 1965 through 1969, founder and later manager of Xerox PARC's Computer Science Laboratory from 1970 through 1983, and founder and manager of Digital Equipment Corporation's Systems Research Center until 1996.

The Interface Message Processor (IMP) was the packet switching node used to interconnect participant networks to the ARPANET from the late 1960s to 1989. It was the first generation of gateways, which are known today as routers. An IMP was a ruggedized Honeywell DDP-516 minicomputer with special-purpose interfaces and software. In later years the IMPs were made from the non-ruggedized Honeywell 316 which could handle two-thirds of the communication traffic at approximately one-half the cost. An IMP requires the connection to a host computer via a special bit-serial interface, defined in BBN Report 1822. The IMP software and the ARPA network communications protocol running on the IMPs was discussed in RFC 1, the first of a series of standardization documents published by the Internet Engineering Task Force (IETF).

The Network Voice Protocol (NVP) was a pioneering computer network protocol for transporting human speech over packetized communications networks. It was an early example of Voice over Internet Protocol technology.

Lawrence Gilman Roberts was an American engineer who received the Draper Prize in 2001 "for the development of the Internet", and the Principe de Asturias Award in 2002.

Computer Networks: The Heralds of Resource Sharing is a short documentary film from 1972, produced by Steven King and directed/edited by Peter Chvany, about ARPANET, an early packet switching network and the first network to implement the protocol suite TCP/IP.

The NPL Network or NPL Data Communications Network was a local area computer network operated by a team from the National Physical Laboratory in Teddington outside London that pioneered the concept of packet switching. Following a pilot experiment during 1967, elements of the first version of the network, Mark I, became operational during 1969 then fully operational in 1970, and the Mark II version operated from 1973 until 1986. The NPL network, followed by the wide area ARPANET in the United States, were the first two computer networks that implemented packet switching, and were interconnected in the early 1970s. The NPL network was designed and directed by Donald Davies.

Frank Evans Heart was an American computer engineer, who, along with a team of others, designed the first routing computer for the ARPANET, the predecessor to the Internet.

SATNET, also known as the Atlantic Packet Satellite Network, was an early satellite network that formed an initial segment of the Internet. It was implemented by BBN Technologies under the direction of the Advanced Research Projects Agency.

The ARPANET pioneered the creation of novel encryption devices for packet networks in the 1970s and 1980s, and as such were ancestors to today's IPsec architecture, and High Assurance Internet Protocol Encryptor (HAIPE) devices more specifically.

## References

1. L. A. Lievrouw, Handbook of New Media: Student Edition (p. 253) (edited by L. A. Lievrouw, S. M. Livingstone), published by SAGE 2006 (abridged, reprint, revised), 475 pages, ISBN   1412918731 [Retrieved 2015-08-15].
2. G. Schneider; J. Evans; K. Pinard (2009). The Internet – Illustrated. Cengage Learning. ISBN   978-0538750981 . Retrieved 15 August 2015.
3. K. G. Coffman & A. M. Odlyzco, Optical Fiber Telecommunications IV-B: Systems and Impairments, published by Academic Press, 22 May 2002, 1022 pages, Optics and Photonics, ISBN   0080513190, (edited by I. Kaminow & T. Li) [Retrieved 2015-08-15].
4. R. Oppliger (2001). Internet and Intranet Security. Artech House. p. 12. ISBN   978-1580531665 . Retrieved 15 August 2015.
5. H. Bidgoli, ed. (2004). The Internet Encyclopedia. 2: G–O. John Wiley & Sons. ISBN   978-0471689966 . Retrieved 15 August 2015.
6. "Lawrence Roberts Manages The ARPANET Program". Living Internet.com. Retrieved 6 November 2008.
7. "Paul Baran and the Origins of the Internet". RAND corporation. Retrieved 29 March 2011.
8. Scantlebury, Roger (25 June 2013). "Internet pioneers airbrushed from history". The Guardian. Retrieved 1 August 2015.
9. "Packets of data were the key...". NPL. Retrieved 1 August 2015.
10. "J.C.R. Licklider And The Universal Network", Living Internet
11. "IPTO – Information Processing Techniques Office", Living Internet
12. John Markoff (20 December 1999). "An Internet Pioneer Ponders the Next Revolution". The New York Times. Archived from the original on 22 September 2008. Retrieved 20 September 2008.
13. Isaacson, Walter (2014). The Innovators: How a Group of Hackers, Geniuses, and Geeks Created the Digital Revolution. Simon & Schuster. p. 237. ISBN   9781476708690.
14. "The accelerator of the modern age". BBC News. 5 August 2008. Retrieved 19 May 2009.
15. Evans 2018, p. 112.
16. Evans 2018, p. 113.
17. Evans 2018, p. 116.
18. Roberts, Lawrence G. (November 1978). "The Evolution of Packet Switching". Archived from the original on 24 March 2016. Retrieved 9 April 2016.
19. "Donald Davies". thocp.net; "Donald Davies". internethalloffame.org.
20. C. Hempstead; W. Worthington (8 August 2005). Encyclopedia of 20th-Century Technology. Routledge 8 Aug 2005, 992 pages, (edited by C. Hempstead, W. Worthington). ISBN   9781135455514 . Retrieved 15 August 2015.(source: Gatlinburg, ... Association for Computing Machinery)
21. M. Ziewitz & I. Brown (2013). Research Handbook on Governance of the Internet. Edward Elgar Publishing. p. 7. ISBN   978-1849805049 . Retrieved 16 August 2015.
22. Markoff, John, Innovator who helped create PC, Internet and the mouse, New York Times, April 15, 2017, p.A1
23. "Lawrence Roberts Manages The ARPANET Program". Living Internet. 7 January 2000. Retrieved 5 September 2017.
24. "IMP -- Interface Message Processor". Living Internet. 7 January 2000. Retrieved 5 September 2017.
25. "Lawrence Roberts". Encyclopædia Britannica. Retrieved 5 September 2017.
26. Roberts, Lawrence G. Dr (November 1978). "The Evolution of Packet Switching". Archived from the original on 24 March 2016. Retrieved 5 September 2017.
27. Gillies, James; Cailliau, Robert (2000). How the Web was Born: The Story of the World Wide Web. Oxford University Press. p. 25. ISBN   978-0192862075.
28. Isaacson, Walter (2014). The Innovators: How a Group of Hackers, Geniuses, and Geeks Created the Digital Revolution. Simon & Schuster. p. 237. ISBN   9781476708690.
29. "Inductee Details - Donald Watts Davies". National Inventors Hall of Fame. Archived from the original on 6 September 2017. Retrieved 6 September 2017.
30. Cambell-Kelly, Martin (Autumn 2008). "Pioneer Profiles: Donald Davies". Computer Resurrection (44). ISSN   0958-7403.
31. "Brief History of the Internet". Internet Society. Retrieved 12 July 2017.
32. "Looking back at the ARPANET effort, 34 years later". February 2003. Retrieved 5 September 2017.
33. Abbate, Jane (2000). Inventing the Internet. MIT Press. p. 38. ISBN   978-0262261333.
34. Heart, Frank; Kahn, Robert; Ornstein, Severo; Crowther, William; Walden, David (1970). "The Interface Message Processor for the ARPA Computer Network" (PDF). AFIPS Proc. 36: 565. doi:10.1145/1476936.1477021.
35. Wise, Adrian. "Honeywell DDP-516". Old-Computers.com. Retrieved 21 September 2008.
36. Lukasik, Stephen J. (2011). "Why the Arpanet Was Built". IEEE Annals of the History of Computing. 33 (3): 4–20. doi:10.1109/MAHC.2010.11.
37. "Charles Herzfeld on the ARPANET and Computers". About.com . Retrieved 21 December 2008.
38. Janet Abbate (2000) Inventing the Internet pp.194-5
39. Vernon W. Ruttan (2005) Is War Necessary for Economic Growth? p.125
40. "Brief History of the Internet". Internet Society. Retrieved 12 July 2017. (footnote 5)
41. Brand, Stewart (March 2001). "Founding Father". Wired . 9 (03). Retrieved 31 December 2011.
42. "Shapiro: Computer Network Meeting of October 9-10, 1967". stanford.edu.
43. "ARPANET – The First Internet", Living Internet
44. Jessica Savio (1 April 2011). "Browsing history: A heritage site has been set up in Boelter Hall 3420, the room the first Internet message originated in". Daily Bruin. UCLA.
45. Chris Sutton (2 September 2004). "Internet Began 35 Years Ago at UCLA with First Message Ever Sent Between Two Computers". UCLA. Archived from the original on 8 March 2008.
46. "NORSAR becomes the first non-US node on ARPANET, the predecessor to today's Internet". NORSAR (Norway Seismic Array Research). Archived from the original on 11 September 2017. Retrieved 14 November 2017.
47. DEFENSE DATA NETWORK NEWSLETTER DDN-NEWS 26, 6 May 1983
48. ARPANET INFORMATION BROCHURE (NIC 50003) Defense Communications Agency, December 1985.
49. Alex McKenzie; Dave Walden (1991). "ARPANET, the Defense Data Network, and Internet". The Froehlich/Kent Encyclopedia of Telecommunications. 1. CRC Press. pp. 341–375. ISBN   978-0-8247-2900-4.
50. Stacy, Christopher C. (7 September 1982). "Getting Started Computing at the AI Lab". hdl:1721.1/41180.Cite journal requires |journal= (help)
51. Kirstein, Peter T. (July–September 2009). "The Early Days of the Arpanet". IEEE Annals of the History of Computing. 31 (3): 67. doi:10.1109/mahc.2009.35. ISSN   1058-6180.
52. "NSFNET – National Science Foundation Network", Living Internet
53. Meinel, Christoph; Sack, Harald (21 February 2014). Digital Communication. ISBN   9783642543319.
54. "III". A History of the ARPANET: The First Decade (Report). Arlington, VA: Bolt, Beranek & Newman Inc. 1 April 1981. p. 132. section 2.3.4
55. Abbate, Janet (11 June 1999). Inventing the Internet. Cambridge, MA: MIT Press. ISBN   978-0-262-01172-3.
56. "Milestones:Birthplace of the Internet, 1969". IEEE Global History Network. IEEE. Retrieved 4 August 2011.
57. "Milestones:Inception of the ARPANET, 1969". IEEE Global History Network. IEEE. Retrieved 4 August 2011.
58. Interface Message Processor: Specifications for the Interconnection of a Host and an IMP, Report No. 1822, Bolt Beranek and Newman, Inc. (BBN)
59. "NCP – Network Control Program", Living Internet
60. "TCP/IP Internet Protocol", Living Internet
61. Tomlinson, Ray. "The First Network Email". BBN. Archived from the original on 6 May 2006. Retrieved 6 March 2012.
62. Steven King (Producer), Peter Chvany (Director/Editor) (1972). Computer Networks: The Heralds of Resource Sharing. Archived from the original on 15 April 2013. Retrieved 20 December 2011.
63. "Scenario", Benson, Season 6, Episode 132 of 158, American Broadcasting Company (ABC), Witt/Thomas/Harris Productions, 22 February 1985
64. The X-Files Season 5, Ep. 3 "Unusual Suspects".[ better source needed ]
65. Season 2, Episode 11 "2PiR" (stylised "2${\displaystyle \pi }$R")
66. Season 3, Episode 12 "Aletheia"
67. "BBC News - SCI/TECH - Hacking: A history". bbc.co.uk.