The Network Layer

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The Network Layer

The third layer of the OSI model is the Network layer. This layer is mostly associated with the movement of data by means of addressing and routing. It directs the flow of data from a source to a destination, despite the fact that the machines may not be connected to the same physical wire or segment, by finding a path or route from one machine to another. If necessary, this layer can break data into smaller chunks for transmission. This is sometimes necessary when transferring data from one type of physical network to another, for instance, token-ring (which supports larger frame sizes) to ethernet (which supports smaller frame sizes). Of course, it is also responsible for reassembling those smaller chunks into the original data after the data has reached its destination. A number of protocols from the TCP/IP protocol suite exist in this layer, but the network protocol that is responsible for routing and delivery of packets is the IP protocol. More on this protocol and the others are discussed later in the chapter.

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