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Additional resources for Architecture Et Reseau, Etudes De Cas

Sample text

La commutation de niveau 2 se fonde sur les informations d’adresse MAC pour acheminer les trames, alors que celle de niveau 3 utilise les informations de la couche réseau. La commutation de niveau 2 ne recherche donc pas dans un paquet les informations de la couche réseau, comme c’est le cas de la commutation de niveau 3. A la place, elle examine l’adresse MAC de destination de la trame pour l’envoyer vers l’interface correspondante, si elle connaît son emplacement. Pour cela, elle élabore et maintient une table de commutation qui permet de savoir à quel port ou à quelle interface appartiennent les adresses MAC.

M Coûts d’expansion. Calculez les frais à engager pour le retrait de la totalité d’un câblage Ethernet épais, l’ajout de fonctionnalités supplémentaires ou un changement d’emplacement. Une prévision des besoins futurs permettra aussi d’économiser du temps et de l’argent. m Coûts d’assistance. Les réseaux complexes engendrent davantage de frais d’analyse, de configuration et de maintenance. Par conséquent, il est conseillé de limiter la complexité au strict 16 Partie I Architecture de réseaux nécessaire.

Ponts Les ponts servent à séparer logiquement des segments d’un même réseau. Ils opèrent au niveau de la couche Liaison de données du modèle OSI (couche 2) et sont indépendants des protocoles de couche supérieure. Commutateurs Les commutateurs sont semblables aux ponts, mais ils possèdent généralement un plus grand nombre de ports. Chaque port dessert un seul segment de réseau, séparant de ce fait les domaines de collision (collision domain). Aujourd’hui, dans les armoires de câblage, les concepteurs de réseaux remplacent les hubs par des commutateurs afin d’augmenter les performances ainsi que la bande passante du réseau, tout en préservant les investissements existants en matière de câblage.

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