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In addition to reliable transmission, the data link layer, unlike the physical layer, provides structure to the messages that are being transmitted. The physical layer is concerned only with the delivery of the individual bits that make up the messages, and does not care about the structure of those messages. The data link layer, on the other hand, often divides messages into frames and adds additional information to the frames to provide synchronization and flow control. By synchronization we mean that the sender and receiver must agree on the start and end of each frame, and by flow control we mean that the receiver must have a mechanism for pacing the sender, so that the sender does not flood the receiver with data at a pace faster than the receiver can accept it. The network layer is concerned with end-to-end communication between computers that are not necessarily directly connected one to another. When machines that wish to communicate are not directly connected, they must rely on other machines that are directly connected to relay their messages. The network layer is the lowest layer of networking protocol with a focus on exchanging messages by means of relaying communications between intervening computers. For example, you have probably passed notes in class. If the person to whom you want to pass the note is on the other side of the classroom, you have to rely on the people sitting between you to pass the message. It may be the case that you know that your message will be safely exchanged between yourself and the person sitting next to you (i.e., point-to-point communication), but once the message is in the hands of the next person in the chain, it may be lost. We can also use the analogy of passing notes in a classroom to illustrate one of the most important services provided by the network layer: routing. You may realize that there are several paths by which your message could make its way to your friend. Some of these paths may be faster than others, or some may be more reliable. Routing refers to the process of identifying the possible paths that you may use to transmit your message, and selecting the best path based on criteria that you specify. Routing is a service provided by the network layer. The network layer usually does not make any guarantee of the end-to-end correctness of the message transmission. Because computers on the network can fail at any time, and new computers can be added to the network at any time, it is possible for frame routes to change in midmessage. As a result, frames of a message can arrive out of order, or frames can be duplicated, or frames can be lost. In most cases, we care that the entire message be transmitted correctly, so another layer of protocol provides that guarantee. Ensuring not only that the message will be successfully passed between pairs of computers, but also that the message will be received correctly at the destination, is the job of the transport layer protocol. The transport protocol keeps track of the sequencing of frames in a message, and insures that regardless of whatever bad things may happen during transmission, the receiver will get all the frames, in the correct order, without duplications. The OSI model provides three higher layers: the session, presentation, and application layers. While the OSI model distinguishes the services to be provided by each of these layers, this portion of the OSI model has never been widely adopted in practice. Instead, the highest layers of the protocol stack have been joined together as the application layer. The rationale has been that once the message has been reliably transmitted between computers, possibly via a world wide web of computer connections, understanding the meaning of the message, and reacting appropriately, is the responsibility of whatever application program received the message. This approach has become known as the internet reference model, and it is shown in Fig. 7-2. The internet reference model is the most widely used model in practice.
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