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There are two main types of datalink layers. The simplest datalink layer is when there are only two communicating systems that are directly connected through the physical layer. Such a datalink layer is used when there is a point-to-point link between the two communicating systems. These two systems can be hosts or routers. PPP (Point-to-Point Protocol), defined in :rfc:`1661`, is an example of such a point-to-point datalink layer. Datalink layer entities exchange `frames`. A datalink :term:`frame` sent by a datalink layer entity on the left is transmitted through the physical layer, so that it can reach the datalink layer entity on the right. Point-to-point datalink layers can either provide an unreliable service (frames can be corrupted or lost) or a reliable service (in this case, the datalink layer includes retransmission mechanisms).
Il y a deux principaux types de couches de liaison de données. La couche de liaison de données la plus simple est celle en place lorsqu'il n'y a que deux systèmes communiquant entre eux qui sont directement connectés via la couche physique. Une telle couche de liaison de données est utilisée lorsqu'il y a une liaison point-to-point (point à point) entre les deux systèmes communicants. Ces deux systèmes peuvent être des hôtes ou des routeurs. Le PPP (Point-to-Point Protocol), défini dans le :rfc:`1661`, est un exemple d'une telle couche de liaison de données point-to-point. Les couches de liaison de données échangent des frames. Une :term:`frame` de la couche datalink envoyée par une couche de liaison de données à gauche est transmise à travers la couche physique, de sorte à ce qu'elle puisse atteindre la couche de liaison de données sur la droite. Les couches de liaison de données Point-to-point peuvent soit fournir un service non fiable (les frames pouvant être corrompues ou perdues), soit un service fiable (dans ce cas, la couche de liaison de données inclut des mécanismes de retransmission).
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