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The second type of datalink layer is the one used in Local Area Networks (LAN). Conceptually, a LAN is a set of communicating devices such that any two devices can directly exchange frames through the datalink layer. Both hosts and routers can be connected to a LAN. Some LANs only connect a few devices, but there are LANs that can connect hundreds or even thousands of devices. In this chapter, we focus on the utilization of point-to-point datalink layers. We describe later the organization and the operation of Local Area Networks and their impact on the network layer.
Le second type de couche de liaison de données est celui utilisé dans les réseaux locaux (LAN). Fondamentalement, une LAN est un ensemble de périphériques qui communiquent ensemble de sorte à ce que n'importe quelle paire de périphériques puissent directement échanger des frames à travers la couche de liaison de données. Les hôtes et les routeurs peuvent tous deux être connectés à un réseau LAN. Certaines LAN peuvent accepter seulement quelques périphériques, mais il existe des lan qui peuvent connecter des centaines voire des milliers de périphériques. Dans ce chapitre, nous nous concentrons sur l'utilisation de couches de liaison de données point-to-point. Nous décrirons plus tard l'organisation et la maintenance des réseaux locaux ainsi que leur impact sur la couche réseau.
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