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Introduction 1-1
Chapter 1
Introduction
Computer Networking:
A Top Down Approach
Featuring the Internet,
3rd edition.
Jim Kurose, Keith Ross
Addison-Wesley, July
2004.
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 1996-2004
J.F Kurose and K.W. Ross, All Rights Reserved

Introduction 1-2
Chapter 1: Introduction
Sommaire:
Qu’est ce qu’Internet
Qu’est ce qu’un protocole?
Les “bords” du réseau
Le coeur du réseau
Accès au réseau, média physique
Structure de l’Internet
Performance: pertes, delais, débit
Couches de protocole, modèle de service
Modélisation

Introduction 1-3
Qu’est ce qu’ Internet: approche
descriptive
Des millions d’ordinateurs
connectés: hôtes(PC,
serveurs, PDA, iPod, cells,
véhicules, applications variées)
Exécutent des
applications
Liens de communication
Fibre optique, cuivre,
radio, satellite
transmission rate = bande
passante [bandwidth, bps]
routeurs: routent des
paquets
FAI local
Réseau
local
FAI regional
routeur station
serveur mobile

Introduction 1-4
Qu’est ce qu’ Internet: approche
descriptive
Les protocoles controlent
l’envoi, la réception de
messages
Ex:TCP, IP, HTTP, FTP, PPP
Internet = “réseau de
réseaux”
Peu hiérarchisé
Standards d’Internet
RFC: Request for comments
IETF: Internet Engineering
Task Force www.ietf.org
IEEE: Institute of Electrical &
Electronics Engineers
local ISP
company
network
regional ISP
router workstation
server mobile

Introduction 1-5
Qu’est ce qu’ Internet : les services
L’infrastructure de
communication favorise les
applications distribuées:
Web, email, jeux, e-commerce,
partage de fichiers
Services de communication
services fournis aux applications
Deux formes:
•Sans connection, non fiable (non
garanti)
•Orienté connection, fiable
(garanti)
Évolution constante