1. Computer Networks 0001-History, Standards Gergely Windisch windisch.gergely@nik.uni-obuda.hu

2. How networks came to be How Networks came to be – sharing resources – need for remote terminals

3. How networks look like Client - server model

4. How networks look like Client - server model

5. How networks look like Peer - to - peer

6. Standards Why standards matter IEEE ISO RFC – Internet Engineering Task Force

7. Standards Source: http://xkcd.com/927/

8. Basic concepts Serial / parallel

9. Basic concepts simplex / duplex / half-duplex

10. Basic concepts synchronious / asynchroniuous

11. Basic concepts data rates – bit, Mbit, Gbit etc. – http://en.wikipedia.org/wiki/List_of_device_bit_r ates

12. Basic concepts topological classification – star – ring – tree – bus – mesh

13. Basic concepts topological classification – star – ring – tree – bus – mesh

14. Basic concepts topological classification – star – ring – tree – bus – mesh

15. Basic concepts topological classification – star – ring – tree – bus – mesh

16. Basic concepts topological classification – star – ring – tree – bus – mesh

17. Basic concepts topological classification – star – ring – tree – bus – mesh

18. Basic concepts packet switched / circuit switched

19. Network classifications Transport medium Size

20. Transport medium Wired Wireless

21. Transport medium Wired – Copper based – Optical fiber Wireless – radiowaves – laser – microwave

22. Transport medium Wired – Copper based Coaxial Twisted pair – Optical fiber Thin, not so thin

23. Coaxial TV, Computers

24. Twisted pair UTP, STP

25. Twisted pair Wiring - Straight vs crosslink

26. UTP categories Cat3, Cat5, Cat5e, Cat6 – How many twists per meter, which pairs to use etc. – Higher cat has higher speed

27. Power line Around 100 Mbps - under development

28. Fiber Single mode Multi mode

29. Fiber

31. Network classification - size PAN LAN MAN WAN

32. Classification Synchronous – some form of synchronization mechanism Asyncrhonous – anything goes, in-data sync expensive (as in too many syn bits / transmission)

33. Classificiation Circuit switched Packet switched

34. Efficient use of network resources Multiplexing frames error correction / error detection flow control windowing