Internet QoS

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Lecture 10

• Internet QoS
• Basic concepts
• Networking hardware

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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

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The Internet

• Collection of interconnected networks.
• Internet core Internet periphery

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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

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Bridging the gap
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Hourglass Internet architecture
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Internet protocol stack

• Why layering
• Peers
• Encapsulation and decapsulation

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Internet protocol stack
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Internet protocols
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Encapsulation
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Multiplexing - demultiplexing
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Internet applications
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Socket the network abstraction. Asynchronicity
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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.

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Networking techniques

• Circuit switching
• Message switching
• Packet switching store and forward networks
• Datagram
• Virtual circuit

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Network versus transport layer service
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Time Division Multiplexing (TDM) and Frequency
Division Multiplexing (FDM)
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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)

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Network interfaces - asynchronicity
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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

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Routers
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Dial-up networks
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ISDN
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HCF