1. Lecture 19: Internet Intro to IT COSC1078 Introduction to Information Technology Lecture 19 Internet James Harland james.harland@rmit.edu.au

2. Lecture 19: InternetIntro to IT Introduction to IT 1-4 Introduction, Images, Audio, Video 5-6 Computer Fundamentals Assignment 1, WebLearn Test 1 7 Review 8 Operating Systems WebLearn Test 2 9 Operating Systems Assignment 2 10 Survey & Internet 11 Internet Security WebLearn Test 3 12 Future of ITAssignment 3, Peer and Self Assessment

3. Lecture 19: InternetIntro to IT Survey Who is this? Cecily Walker Teaching and Learning Advisor 10.10.1 cecily.walker@rmit.edu.au

4. Lecture 19: InternetIntro to IT Overview  Survey  Questions?  Assignment 3  Internet  Questions?

5. Lecture 19: InternetIntro to IT Assignment 3  Review (re-) answer What is IT? questions from Tutorial 1 Identify difficult parts of the course Suggest new questions Include favourites from Assignments 1 and 2  Reflect Answer reflection questions from tutorials  Research Write about a particular IT topic of your choice (5-6 paragraphs)

6. Lecture 19: Internet: ImagesIntro to IT Internet Worldwide publically accessible network of (millions of) interconnected computer networks which carry information and provide services

7. Lecture 19: Internet: ImagesIntro to IT Internet

8. Lecture 19: Internet: ImagesIntro to IT Internet

10. Lecture 19: Internet: ImagesIntro to IT Internet

11. Lecture 19: Internet: ImagesIntro to IT Communications Developments  ????: Writing  1440: Printing press  1844: Telegraph  1877: Telephone  1919: Radio  1928: Television  1969: ARPANET (Advanced Research Projects Agency)  1970's: Internet Protocol (IP)  1984: Domain names (.com,.org, etc)  1991: World Wide Web ....

12. Lecture 19: Internet: ImagesIntro to IT Number of Internet Hosts

13. Internet  Originally designed to survive nuclear war  Grew out of army research into missile communication  Key role in breaking down the Berlin Wall

15. Lecture 5: InternetIntro to IT Internet  Dedicated channel: two nodes exclusively use a single channel works like traditional telephone  Packet switching: break data down into packets send packets from many users along link can exploit redundancies and variations in network

16. Lecture 5: InternetIntro to IT Protocols  Transmission Control Protocol (TCP): basic necessities for data transfer connection-oriented  Internet Protocol (IP): data-oriented necessary for packet-switched network “Should run on two tin cans and a string” There is an implementation for carrier pigeons...

17. Lecture 5: InternetIntro to IT Protocols

18. Lecture 5: InternetIntro to IT Application Protocols  Define messages sent and data formats used  Generally known by user  Examples include HTTP, HTTPS, FTP, etc. Often specified in resource identifiers http://www.mysite.com:8080/info/mypage.html

19. Lecture 5: InternetIntro to IT World Wide Web (WWW)  Combination of 4 different ideas:  Hypertext: information format for moving documents around  Markup Language: codes embedded in text indicating structure and presentation meaning  Resource Identifiers (URI, URL,...)  Client-server model: client software requests resources from servers

20. Lecture 5: InternetIntro to IT Internet Uses  File transfer & remote services  Email  Instant messaging  Web browsing  Peer to peer (P2P)  Telephony  Streaming media  “Web 2.0” ....

21. Lecture 19: InternetIntro to IT Conclusion  Work on Assignment 3  Name 5 people who are unaffected by the Internet …