Chapter1_sec5_Selcuk

Chapter1_sec5_Selcuk - Chapter1 Introduction...

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 Introduction 1-1 Chapter 1 Introduction Computer Networking: A Top  Down Approach , A note on the use of these ppt slides: We’re making these slides freely available to all (faculty, students, readers). They’re in PowerPoint form so you can add, modify, and delete slides (including this one) and slide content to suit your needs. They obviously represent a lot of work on our part. In return for use, we only ask the following: If you use these slides (e.g., in a class) in substantially unaltered form, that you mention their source (after all, we’d like people to use our book!) If you post any slides in substantially unaltered form on a www site, that you note that they are adapted from (or perhaps identical to) our slides, and note our copyright of this material. Thanks and enjoy! JFK/KWR All material copyright 1996-2009 J.F Kurose and K.W. Ross, All Rights Reserved
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 Introduction 1-2 Chapter 1: roadmap 1.1  What is the Internet? 1.2  Network edge  end systems, access networks, links 1.3  Network core  circuit switching, packet switching, network structure 1.4  Delay, loss and throughput in packet-switched networks 1.5 Protocol layers, service models 1.6  Networks under attack: security 1.7  History
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 Introduction 1-3 Protocol “Layers” Networks are complex!  many “pieces”: hosts routers links of various media applications protocols hardware, software Question:   Is there any hope of organizing a  network architecture? Or at least our discussion of  network architecture?
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 Introduction 1-4 Organization of air travel Whats the structure of an airline system? (pilots, traffic control, airplanes, etc.) one way to structure it: list actions actions involve a series of steps any anologies with Computer Networks? ticket (purchase) baggage (check) gates (load) runway takeoff airplane routing ticket (complain) baggage (claim) gates (unload) runway landing airplane routing airplane routing Source Destination e.g, a real-life complex system
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 Introduction 1-5 departure airport arrival airport intermediate air-traffic control centers ticket baggage gate takeoff/landing airplane routing Horizontal Layering of airline  functionality Layers:  each layer implements a service via its own internal-layer actions relying on services provided by layer below Baggage service: To already ticketed passenger 
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 Introduction 1-6 Why layering? Dealing with complex systems: explicit structure allows identification, simplification, relationship of complex  system’s pieces layered  reference model  for discussion responsibilities shared simplification is of value  providing modularization, isolation.  modularization eases maintenance, updating of system  change of implementation of layer’s service transparent to rest of system  (advantage) e.g., change in gate procedure doesn’t affect rest of system layering considered harmful?
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Chapter1_sec5_Selcuk - Chapter1 Introduction...

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