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Sagot :
The second tier of the seven-layer OSI model of computer networking is known as the data link layer or layer 2. This layer serves as the protocol for sending data between nodes on the same local area network segment or between network nodes in a wide area network.
The communication of end devices in a network is governed by standard layers and protocols found in network models like the OSI and TCP/IP suites. There are four tiers in the TCP/IP suite model: application, transport, internet, and network access layers. The data-link and physical layers of the OSI model are handled by the network access. A broadcast message is sent to every computer in the network to gather the remote host address needed for a unicast transmission to happen when a packet has to be delivered to another unidentified host while being contained in a data-link header and trailer.
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