1. Lecture 10
Internet QoS
Basic concepts
Networking hardware

2. Projects and midterm
I expect a progress report by Friday next week from all individuals or groups.
Midterm: two weeks from today –
Material – Chapters 1,2, and 3 up to the last lecture.
Open book.
3 questions: 30 minutes

3. The Internet Collection of interconnected networks.
Internet core + Internet periphery

5. Layered network architecture
Communication protocols.
Bridge the gap between what applications expect and what the technology provides.
Implement basic mechanisms:
Error control
Flow control
Congestion control

6. Bridging the gap…

7. Hourglass Internet architecture

8. Internet protocol stack
Why layering
Peers
Encapsulation and decapsulation

9. Internet protocol stack

10. Internet protocols

11. Encapsulation

12. Multiplexing - demultiplexing

13. Internet applications

14. Socket – the network abstraction. Asynchronicity

15. Internet service model
Best effort model.
The source of early success – it causes problems nowadays.
How to deal with QoS constraints?
End-to-end QoS requires Internet QoS.

16. Networking techniques
Circuit switching
Message switching
Packet switching – store and forward networks
Datagram
Virtual circuit

18. Network versus transport layer service

19. Time Division Multiplexing (TDM) and Frequency Division Multiplexing (FDM)

20. Networking hardware Communication channels Network interfaces Switches
Types of networks:
Wide Area Networks – WANs
Local Area Networks – LANs
Residential Access Networks
Dial up
Integrated Service Data Networks (ISDN)
Hybrid Coaxial Fiber (HCF)

21. Network interfaces - asynchronicity

22. Network switches What is a switch
Hub – physical layer switch. Used in Local Area Networks
Bridge – data link layer switch. Used in Local Area Networks
Router – network layer switch. Used in Wide Area Networks

25. Routers

26. Dial-up networks

27. ISDN

28. HCF