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Networking Fundamentals Courses

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Networking Fundamentals Courses

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Cours de Réseaux Informatiques




Suite Chapitre 1

Sonia GAIED




1ère année L. Info 2025/2026

, Caractéristiques d’un réseau

• Topologie
• Câblage
• Méthode d’accès au médium




2

, Les câbles
• Les supports de transmission sont tous les moyens par
lesquels on peut conduire un signal de son lieu de
production à sa destination avec le moins possible
d’affaiblissement, dispersions ou distorsions.
– L'affaiblissement réduit la puissance du signal
– la dispersion étale le signal temporellement ou
fréquentiellement,
– la distorsion modifie sa forme ou ses composantes.

Ces phénomènes nuisent à l'intégrité de l'information
et dégradent le signal.

3

, Les câbles
• Le choix d’un câblage d’un réseau nécessite la réponse aux
questions suivantes:

– Quel est le volume de trafic sur le réseau ?
– Quels sont les besoins en matière de sécurité ?
– Quelle distance devra couvrir le câble ?
– Quel est le budget prévu pour le câblage ?




4

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