The lower layers may drop packets, but the transport layer performs a sequence check on the data and ensures that if a 12MB file is sent, the full 12MB is received. "OSI transport services ...

The OSI Reference Model defines seven layers or groups of tasks that must be addressed. In order for two devices to communicate, they must be compatible at all seven layers. 7.2.1 Role of a Layered ...

In Chapter 4 we focused mostly on media and the physical layer (layer 1 of the OSI model), and did not include any discussion about specific network components. Similarly, Chapter 5, which examined ...