progress bar code in vb.net Figure 2-15 Connectivity. in Software

Generation EAN / UCC - 13 in Software Figure 2-15 Connectivity.

Figure 2-15 Connectivity.
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devices, however, only care 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.
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The OSI Model relies on a process called enveloping, illustrated in Figure 2-16, to perform its tasks. If we return to our earlier e-mail example, we find that each time a layer invokes a particular protocol to perform its tasks, it wraps the user s data in an envelope of overhead information that tells the receiving device about the protocol used. For example, if a layer uses a particular compression technique to reduce the size of a transmitted file, and a specific encryption algorithm to disguise the content of the file, then it is important that the receiving device be made aware of the technique employed so that it knows how to decompress and decrypt the file when it receives it. Needless to say, quite a bit of overhead must be transmitted with each piece of user data. The overhead is needed, however, if the transmission
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Figure 2-16 The enveloping process.
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Protocols
Protocols
is to work properly. So, as the user s data passes down the so-called stack from layer to layer, additional information is added at each step of the way, as illustrated. In summary then, the message to be transported is handed to layer seven, which performs Application-layer functions and then attaches a header to the beginning of the message that explains the functions performed by that layer so that the receiver can interpret the message correctly. In our illustration, that header function is represented by information written on the envelope at each layer. When the receiving device is finally handed the message at the Physical layer, each succeeding layer must open its own envelope until the kernel, the message, is exposed for the receiving application. Thus, OSI protocols really do work like a nested Russian doll. After peeling back layer after layer of the network onion, the core message is exposed. Let s now go back to our e-mail example, but this time we ll describe it within the detailed context of OSI s layered architecture. We begin with a lesson on linguistics.
Esperanto
An old and somewhat comforting clich observes that wherever one goes, people speak English. In fact, less than 10 percent of the world s population speaks English, and to their credit many of them speak it as a second language.1 Many believe there is a real need for a truly international language. In 1887, Polish physician Ludwig L. Zamenhof published a paper on the need for a universally spoken tongue. He believed that most of the world s international diplomacy disputes resulted from a communication failure between monolingual speakers and the inevitable misunderstandings of nuance that occur when one language is translated into another. Zamenhof set out to solve this Tower-of-Babel problem (origin of the word babble, by the way), the result of which was the creation of the international language called Esperanto. In Esperanto, the word Esperanto means one who hopes. Since its creation, Esperanto has been learned by millions and, believe it or not, is widely spoken; current estimates say that it is known by
Among seasoned international travelers an old joke exists that goes likes this: What do you call someone who speaks three languages Trilingual. OK, what do you call someone who speaks two languages Bilingual. OK, what do you call someone who speaks one language American.
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