l16 a world wide network
TRANSCRIPT
A Brief History of the Internet1969-1995 Computer Networking Simple net run by pioneers 1995-2000 Commercialisation and Growth Enter the ISPs and the public 2000-2005 Stretching the Limit New applications and digital media 2005-2010 Reinventing the Network The New Internet emerges 2010-2015 The App Internet Smartphone takes over the Internet 2015-2020 ? Then what?
“The Internet works because a lot of people cooperate to do things together”
- Jon Postel
1969-1995 Computer Networking
Computer Networking
Defense Strategic reasons during the Cold WarAny computer could be reached, and if one goes down, the others still work
Efforts on connecting computers started earlyTwo principal groups: Defense and Academia
Academia Economic reasonsMainframes are expensive and could be justified only by the collective needs of many departments
ARPANET
▪ Advanced Research Projects Agency (ARPA) – Founded in 1958 – Attributed by the Russian
Sputnik satellite – Renamed to DARPA
▪ Two main objectives – Computers had to talk to each
other to share information – Links had to be robust
The Soviet Union lunched Sputnik 1 on October 4th 1954
The Science, the Endless Frontier
Vannevar Bush, MIT Professor and analog computer pioneer
Oversaw the Manhattan Project
Had influence on US president Franklin Roosevelt to form research institutions
Triangular relationship: Government, Industry and Academia
J.C.R. Licklighter
Pioneered decentralized networks and human-computer interfaces
Founding director of the military office that funded ARPANET
Published paper in 1960: “Man-Computer Symbiosis”
“The hope is that in not too many years, human brains and computing machines will be coupled together very tightly”
Packet SwitchingThe phone network is circuit switchedYou get a “line” all by yourself
The proposed structure of the Internetwas packet switch
Network LayersApplication Layer is for specific application
Transport Layer is for reliable communication
Network Layer is for routing packages
Example: Email messageThe e-mail is about 3,500 bits (3.5 kilobits) in sizeThe network you send it over uses fixed-length packets of 1,024 bits (1 kilobit)The header of each packet is 96 bits long and the trailer is 32 bits long, leaving 896 bits for the payload To break the 3,500 bits of message into packets, you will need four packets divide 3,500 by 896)Three packets will contain 896 bits of payload and the fourth will have 812 bits
Source:Whatisapacket?
Connecting Computers
Source:Modem
The phone system was already there
However it was analog but the network was digital
Modem - modulate and demodulate A device that modulates an analog carrier signal to encode digital information, and also demodulates such a carrier signal to decode the transmitted information
The Early Internet Community
The Internet is a simple peer to peer network Designed to be simple rather than secure
The Internet became a community Most users where highly educated scientists Respect for others – spam nearly nonexistent Antisocial behaviour was rare
Netiquette How to behave on the net Violators are removed from the network
“On the Internet,nobody knows you're a dog.”
- Peter Steiner cartoon in The New Yorker
1995-2000 Commercialisation and growth
The value of a network equals approximately the square of
the number of users of the system (n2)
Metcalfe’s Law
Enter WinSock
In the early 1990 the most popular operating systems were Windows and DOS
Designed for Personal Computers
Network support was later added LANs – NetBIOS
WinSock – Windows Sockets Microsoft had completely ignored TCP/IP Due to demand from IT companies, efforts started in 1991 WinSock 1.0 became available in 1992 It was an API to use sockets to access TCP/IP
World Wide Web
Tim Berners-Lee started his efforts on information sharing in the 1980s Working for CERN, he proposed the creation of non-hierarchical hypertext based systemThe system was to be based on the established TCP/IP protocols
World Wide WebDue to lack of support he started work on his ideas himself
Using a NeXT computer he set out to create a program for building, browsing and editing hypertext pages
HypertextTo move from one document to another
Resource identifiers – URL To locate a particular resource (computer, document or other resource) on the network
Client-server model of computing – HTTPClient software requests of server software resources such as data or files
Markup language – HTMLTags embedded in text indicate to a computer how to print or display the text, e.g. as in italics or bold type
The Basic Idea of WWW
The WWW has not the only idea for a distributed hyperlink system
GopherCreated at the University of Minnesota A distributed document search and retrieval systemHierarchical menu structureReleased in 1991Became very popular
Gopher
Lesson: Why did the WWW succeed?
This design was simple Simple syntaxUniform URL to any resource using any protocolsNo security, not authentication, no tracking
HTTP Simple protocol – GET, POST
HTML Not an advanced markup – enough to display text in different sizes
Did not try to solve the problem of back-links Avoided a huge problemAnd created an huge opportunity for others to solve it
Lesson: Why did the WWW succeed?
WWW was FREE No licence fee - free to use
Gopher failed More rigid systemTree structure – not free formatInitially free, then UoM decided to licence it
Without browsers, the Web would not take offAnd without content, no one would create browsers
MosaicNCSA developed Mosaic Web BrowserDeveloped by Marc Andreesen and Eric Bina
The Internet became synonymous with “mosaic”
First Browsers
Internet Service Providers – ISPThe business of connecting the public to the InternetMany new companies entered this marketAOL became a giant Lot of small ISP using Trumpet WinSock
New services Domain name registration and hostingDial-up access, Leased line accessWeb Design, Email services
Laying the TracksCompanies like Cisco Systems
New Business Emerges
Marc Andreesen and Jim Clark formed Mosaic Communication Corporation 1994
Few months later renamed to NetscapeNetscape became the Internet leader
IPO in 1995 raised $140 millionThe decline came just as fastDid not establish sound business modelsnor build an infrastructure
Went head-on into competition with MicrosoftLater bought by AOL
Netscape
PHONE COMPANIESCOMPLETELY IGNORED THE INTERNET
Have we seen this before?
Mainframe companies ignore the minicomputers Minicomputers ignore the PC 8 inch floppy drive companies ignored the 5,25 inch which ignored the 3,5 inch Western Union ignored the telephone The American car companies ignored the cheap Toyota Corolla Kodak ignored the digital camera
“But none of our customers is asking for this low end cheap…”
“...anInternetbrowserisaverytrivialpieceofsoftware.Thereareatleast30companiesthathavewrittenvery
credibleInternetbrowsers,sothat’snothing...”-BillGates
The Arrogance of the Present
The telephone business and software giants initially ignored the Internet
Their focus was on voice or softwareInternet traffic was using the phone linesClassic example of the RPV theory
Left the field open for new companies
Seeing the success they entered the marketToday most ISPs are phone companies
Enter the Giants
Microsoft Came late to the InternetBill Gates wrote The Road Ahead Were trying to establish a proprietary “Information Superhighway”
Microsoft NetworkMSN was releasedin 1995 with Windows 95
Enter the Giants
Lessons: Internet
▪ The Internet works because of the simplicity– Dumb routing– No security– Anonymity▪ The core of the network is always the same– Innovation is at the edges– No need to upgrade the core when new protocols are
invented
Lessons: Internet
▪ Network infrastructure companies like the telecoms ignored the internet– Did not see any business in consumer connections– RVP theory explains this: their customer were
companies▪ Software vendors like Microsoft ignored the
Internet– Saw no revenue model▪ Left the field open for the Yahoos, Googles etc.
“Doing research on the Web is like using a library assembled piecemeal by pack rats and vandalized nightly”
- Roger Ebert (attributed)
2000-2005 Stretching the Limit
Rise of P2PPeer-to-peer Networks
Relies on the computing power and bandwidth of the participants in the networkPeers act as both clients and serversNo central server
Legal controversy
Stretching the LimitsThe Internet has scaled up to 2+ billion users
Tweaked over the yearsDesigned to be simpleInnovation only happens at the edges
The end-to-end principleHas prevented innovations at its core
Testing the Limits
Visionaries only partially saw the future
The net was designed to be simple peer to peer network
Things like security and social responsibility were not a main concern
Problems with the Internet
Limited IP numbersDumb routing – content unawareSpam, Viruses and DoS attacksIllegal distribution of contentAntisocial behaviour Lack of securityNot possible to update theInternet protocols
“If a planet-wide network were built on Mars, what would it look like?”
- Reinventing the Internet (Economist)
2005-2010 Reinventing the Network
The Internet Infrastructure
Several efforts for reinventing the InternetGENI – Global Environment for Networking InnovationsFIND – Future Internet DesignInternet2PlanetLab
ChallengeHow can we replace the current Internet infrastructure?How can we run multiple protocols at the same time?
“Web 2.0 is the business revolution in the computer industry caused by the move to the Internet as platform,
and an attempt to understand the rules for success on that new platform.” - Tim O'Reilly
Web 2.0
....for seizing the reins of the global media, for founding and framing the new digital democracy, for working for nothing and beating the pros at their own game, TIME's Person of the Year for 2006 is
you
Readmore:http://www.time.com/time/magazine/article/0,9171,1569514,00.html#ixzz1FjqlB9yO
Two Waves of Products Development
In the first wave the product is restricted by the
prevailing technology, but in the second, there is
something new
Web 2.0
New web developments Popularized by O’Reilly and othersRefers to a new phase in architecture and applicationdevelopment of webapplicationsBuzzword that is not easy to define
TrendDesktop Application and Web Application will become the same
The Community
The smartest people in the room is everybody
The Brief History of the Internet
▪ 1969-1995 Computer Networking – Simple net run by pioneers▪ 1995-2000 Commercialization and Growth – Enter the ISPs and the public▪ 2000-2005 Stretching the Limit – New applications and digital media▪ 2005-2010 Reinventing the Network – New business models▪ 2010-2015 The App Internet – The Smartphone Takes over
“Web 2.0 is the business revolution in the computer industry caused by the move to the Internet as platform,
and an attempt to understand the rules for success on that new platform.” - Tim O'Reilly
The App Internet
Source: Mary Meeker’s Internet Trend Presentation (http://www.slideshare.net/AndreBastos3/internet-trends-mary-meeker?qid=4a887629-047d-4084-abec-bafd0c1a7a63&v=default&b=&from_search=2)
The App Internet
The smartphone app takes over the internet
More Internet traffic from smartphones than PCs
The Brief History of the Internet
▪ 1969-1995 Computer Networking – Simple net run by pioneers▪ 1995-2000 Commercialization and Growth – Enter the ISPs and the public▪ 2000-2005 Stretching the Limit – New applications and digital media▪ 2005-2010 Reinventing the Network – New business models▪ 2010-2015 The App Internet – The Smartphone Takes over▪ 2015-2020 ?
Bitcoin
Bitcoin is a cryptocurrency introduced in 2008
Invented by an unidentified programmer, Satoshi Nakamoto.[15]
The number of bitcons is fixed.
Uses strong cryptography
BlockchainA database used by bitcoin - an open ledger
Instead of storing information in a private secure, centralised database, with restricted access…
Store everything openly and use strong cryptography that is verifiable by everyone
hash hash hash hash hash
BlockchainSolves the problem of transactions of two parties that don’t trust each other
A wants to sell something to B, but neither A or B know eachother or trust each other
Trends
Mobile phones are connecting to the InternetSensors will be connected – Internet of Things New media content is emergingAll content will be digital
Internet of things is estimated to be worth $309 billion by 2020
We are just starting this revolution…
Visions of the Future