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The chained layers are made up of layers one through three: the Physical Layer, the Data Link Layer, and the Network Layer. They are responsible for providing a service called connectivity. The end-to-end layers on the other hand comprise the Transport Layer, the Session Layer, the Presentation Layer, and the Application Layer. They provide a service called interoperability. The difference between the two services is important. Connectivity is the process of establishing a physical connection so that electrons can flow correctly from one end of a circuit to the other. There is little intelligence involved in the process; it occurs, after all, pretty far down in the primordial protocol ooze of the OSI Model. Connectivity is critically important to network people it represents their lifeblood. Customers, on the other hand, are typically only aware of the criticality of connectivity when it isn t there for some reason. No dial tone Visible connectivity. Can t connect to the ISP Visible connectivity. Dropped call on a cell phone Visible connectivity. Interoperability, however, is something that customers are much more aware of. Interoperability is the process of guaranteeing logical connectivity between two communicating processes over a physical network. It s wonderful that the lower three layers give a user the ability to spit bits back and forth across a wide area network. But what do the bits mean Without interoperability, that question cannot be answered. For example, in our e-mail scenario, the e-mail application running on the PC and the e-mail application running on the mainframe are logically incompatible with each other for any number of reasons, which will be discussed shortly. They can certainly swap bits back and forth, but without some form of protocol intervention, the bits are meaningless. Think about it: If the PC shown on the left side of Figure 2-13 creates an e-mail message that is compressed, encrypted, ASCII encoded, and shipped across logical channel 17, do the intermediate switches that create the path over which the message is transmitted care Of course not. Only the transmitter and receiver of the message that house the applications that will have to interpret it care about such things. The intermediate switches care that they have electrical connectivity, that they can see the
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Figure 2-13 Connectivity
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bits, that they can determine whether they are the right bits, and whether they are the intended recipient of those bits or not. Therefore, the end devices, the sources and sinks of the message, must implement all seven layers of the OSI Model, because they must not only concern themselves with connectivity issues, but also with issues of interoperability. The intermediate devices, however, care only about the functions and responsibilities provided by the lower three layers. Interoperability, because it only has significance in the end devices, is provided by the end-to-end layers layers four through seven. Connectivity, on the other hand, is provided by the chained layers, layers one through three, because those functions are required in every link of the network chain hence the name. Let me say this one more time: The chained layers are the historical domain of the telephone company.
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Layer by Layer
The OSI Model relies on a process called enveloping, illustrated in Figure 2-14, to perform its tasks. If we return to our earlier e-mail example, we
Figure 2-14 A schematic representation of enveloping
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