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Sayed Ahmed Computer Engineering, BUET MSc. Computer Science, Canada President/Chief Architect/Lead Developer Justetc (Just et cetera) Technologies http://www.justetc.net http://sayed.justetc.net [email protected] Canada Address Trudelle Street Toronto, Ontario, Canada Contact ▪ Sayed Ahmed ▪ [email protected] Bangladesh Address Justetc Computers Habib Complex (2nd Floor) Shimultuly, Gazipur, Dhaka Bangladesh Contact ▪ Rafiqul Islam ▪ [email protected] ▪ 01942747702 Just Etc Technologies, [email protected] 2 Training and Education in Bangla: Bangla.SaLearningSchool.com Training and Education in English: www.SaLearningSchool.com Training and Education in English: English.SaLearningSchool.com Ask a question and get answers : Ask.JustEtc.net Offline IT Training: University.JustEtc.net What is Information Technology Concerned with ▪ Collection, dissemination, processing, and storage of ▪ Information esp. with the use of computers ▪ Design, development, implementation, support, management of ▪ Information Systems – computer based Technologies related to data communications Data Communication Carry data from one place to another or one device to another Examples Telephone Mobile Internet IT + CT = ICT IT in a broader term includes both IT CT IT now also refers to ICT Computing and Information Systems Electronic Data Processing, Artificial Intelligence, Expert Systems Broadcasting Radio and Television Telecommunications Fixed line telephones, mobile phones The Internet Uses telecommunications infrastructure Basic Communication Fixed phone, mobile, fax, radio, television Basic Information Technology Uses basic software and printers Used in basic everyday needs Advanced Communications Email, Internet Browsing, Video Conferencing, ecommerce, VOIP Advanced IT Advanced software are used for complex needs ▪ DBMS, Information Systems, Enterprise Resource Planning, Inventory Management Computer Central tool Radio Television Internet Radio: Sound wave to Electro Magnetic Wave FM broad cast: 87.5 to 108.0 MHz AM broadcast Microwave broadcast http://ptolemy.eecs.berkeley.edu/eecs20/sidebars/rad io/spectrum.gif Television ▪ NTSC ▪ PAL ▪ Used in Bangladesh ▪ SECAM ▪ HDTV The Internet The largest computer network in the world Consists of many interconnected network of ▪ Small sizes ▪ Large sizes Has more than 100 Crore computers Internet History ARPANET ▪ 1969: USA military interconnected four university computers in a network called ARPANET ▪ 1982: TCP/IP got invented. In 1983, ARPANET started to use TCP/IP protocol Expansion of the Internet 1969 to 1983: ▪ Experimental stage ▪ Slow expansion ▪ Covered 20 countries ▪ Around 200 computers got connected 80s: ▪ NSFNET was established on 1986 ▪ Active research started on the Internet Technologies ▪ ARPANET was closed on 1990, and got named as the Internet ▪ ISPs were created on 1989 ▪ So everyone got the opportunity to get connected to the Internet ▪ ISOC (Internet Society) was established on 1992 ▪ Now, you can connect to the Internet using cell phones Thanks Post your questions at http://ask.justetc.net