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History

* Simon * large topic * to save time: only Internet (de facto the modern IT) * development of concepts needed for today’s products and companies --- background-image="img/mainframe.svg"

ARPAnet

* ARPA: Advanced Research Projects Agency * goal: optimize efficiency by sharing computers * (Mainframes only used by 1 person simultaneously) * 1969: First use; end of year: only 4 computers * next years: + institutions in Hawaii, London, Norway * Problem: difficult to manage large amounts of nodes in one network --- background-image="img/packet-switching.svg" background-color="white" ## Packet switching * helps avioding congenstions * split data at transmission * join it back when receiving * think of it as: * cutting photo in half, putting in 2 envelopes * recipient glues them back together --- background-image="img/tcpip.svg" background-color="white" ## TCP/IP * Vinton Cerf * TCP (transmission control protocol)/IP (internet protocol) stack * allowed data transfer and communication between over 4B nodes in network --- background-image="img/email.jpg" ## SMTP * one of the first applications * base for e-mail transfer (still in use today) * most traffic back then --- background-image="img/www.svg" background-color="white"

World Wide Web

* historically more important; by Tim-Berners-Lee (1991; CERN) * developed HTML, HTTP and concept of URLs (all still in use today) * first web browser --- background-image="img/money.svg" ## Commercialization * development of Mosaic * rising popularity of AOL * enabled users to browser the internet from home via telephone line * search engines, shops, early social networks * → fully suitable for end users