Lecture 10 Internet QoS Basic concepts Networking hardware.

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Presentation transcript:

Lecture 10 Internet QoS Basic concepts Networking hardware

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

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

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

Bridging the gap…

Hourglass Internet architecture

Internet protocol stack Why layering Peers Encapsulation and decapsulation

Internet protocol stack

Internet protocols

Encapsulation

Multiplexing - demultiplexing

Internet applications

Socket – the network abstraction. Asynchronicity

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.

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

Network versus transport layer service

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

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)

Network interfaces - asynchronicity

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

Routers

Dial-up networks

ISDN

HCF