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    Introduction 1-1

    Chapter 1Introduction

    ComputerNetworking: ATop Down

    Approach

    6th

    editionJim Kurose, KeithRossAddison-WesleyMarch 2012

    A note on the use of these ppt slides:Were making these slides freely available to all (faculty, students, readers).

    Theyre in o!eroint form so you see the animations" and can add, modify,

    and delete slides (including this one) and slide content to suit your needs.

    They obviously represent a lotof !ork on our part. #n return for use, !e only

    ask the follo!ing:

    #f you use these slides (e.g., in a class) that you mention their source

    (after all, !ed like people to use our book$) #f you post any slides on a !!! site, that you note that they are adapted

    from (or perhaps identical to) our slides, and note our copyright of this

    material.

    Thanks and en%oy$ &'W*

    All material copyright +-/0+/ &.' urose and .W. *oss, All *ights *eserved

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    Introduction

    Chapter 1 introduction

    our goal: !et "#eel$ and

    terminolo!y more depth,

    detail laterincourse

    approach

    use Internetas e%ample

    overview &hat's the Internet(

    &hat's a protocol(

    net&or) ed!e* hosts, access

    net, physical media net&or) core pac)et+circuit

    s&itchin!, Internet structure

    per#ormance loss, delay,

    throu!hput security

    protocol layers, sericemodels

    history 1-2

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    Introduction

    Chapter 1 roadmap

    11 &hat isthe Internet(12net&or) ed!e

    end systems, access net&or)s, lin)s

    1. net&or) core pac)et s&itchin!, circuit s&itchin!, net&or)structure

    1/ delay, loss, throu!hput in net&or)s

    1protocol layers, serice models16net&or)s under attac) security

    1history

    1-.

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    Introduction

    What's the Internet "nuts and olts$ie&

    millions o# connectedcomputin! deices hosts =end

    systems

    runnin! networkapps

    communicationlinks 3er, copper,

    radio, satellite transmission

    rate bandwidth

    Packet switches:#or&ard pac)ets4chun)s o# data5 routersand

    !iredlinks

    !irelesslinks

    router

    mobile net!ork

    global #1

    regional #1homenet!ork

    institutional net!ork

    smartphone

    2

    server

    !irelesslaptop

    1-/

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    Introduction

    "un$ internet appliances

    # picture frame

    http:!!!.ceiva.com

    Webenabled toaster 3

    !eather forecaster

    #nternet phones#nternet

    refrigerator

    1lingbo4: !atch,

    control cable T5 remotely

    1-

    T!eeta!att:

    monitor energy use

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    Introduction

    Internet: "net&or) o#net&or)s$ Interconnected I78s

    protocolscontrol sendin!,

    receiin! o# ms!s e!, 9C8, I8, :998, 7)ype,

    ;0211

    Internet standards

    RC Re

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    What's the Internet a serice ie&

    Inrastructure thatprovides services toapplications:

    We, >oI8, email,!ames, e-commerce,social nets, ?

    provides

    programminginterace to apps hoo)s that allo&

    sendin! and receiin!

    app pro!rams to" $

    mobile net!ork

    global #1

    regional #1homenet!ork

    institutional net!ork

    Introduction

    1-

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    What's a protocol(

    human protocols: "&hat's the time($

    "I hae a

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    a human protocol and a computer net&or)protocol

    #:other human

    protocols(

    6i

    6i

    7ot the

    time8

    /:00

    T2 connectionresponse

    7ethttp:!!!.a!l.comkuroseross

    9filetime

    T2 connection

    re;uest

    What's a protocol(

    1-@

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    Introduction

    Chapter 1 roadmap

    11 &hat isthe Internet(12 net&or) ed!e

    end systems, access net&or)s, lin)s

    1. net&or) core pac)et s&itchin!, circuit s&itchin!, net&or)structure

    1/ delay, loss, throu!hput in net&or)s

    1protocol layers, serice models16net&or)s under attac) security

    1history

    1-10

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    Introduction

    A closer loo) at net&or)structure

    network edge: hosts clients and

    serers

    serers o#ten in data

    centers access networks"physical media:&ired, &irelesscommunication

    lin)s network core: interconnectedroutersnet&or) o#

    net&or)s

    mobile net!ork

    global #1

    regional #1homenet!ork

    institutional net!ork

    1-11

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    Introduction

    Access net&or)s and physicalmedia

    #: $ow to connectend systems toedge router%

    residential access nets

    institutional accessnet&or)s 4school,company5

    moile access

    net&or)s

    keep in mind: and&idth 4its per

    second5 o# accessnet&or)( 1-12

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    Introduction

    Access net di!ital suscrier line47B5

    central office

    #1

    telephonenet!ork

    voice, data transmittedat different frequencies over

    dedicated line to central office

    use e&istingtelephone line to central oce 7BAM data oer 7B phone line !oes to Internet oice oer 7B phone line !oes to telephone net

    D 2 Mps upstream transmission rate 4typically D1 Mps5

    D 2/ Mps do&nstream transmission rate 4typicallyD 10 M s

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    Introduction

    Access net calenet&or)

    cablemodem

    splitter

    cable headend

    2hannels

    5

    #

    bs


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