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This best-selling and vintage ebook teaches you the foremost ideas of desktop networks with examples drawn from the true international of community and protocol layout. utilizing the web because the basic instance, the authors clarify a variety of protocols and networking applied sciences. Their systems-oriented process encourages you to contemplate how person community elements healthy right into a greater, complicated method of interactions. no matter what your standpoint, no matter if or not it's that of an software developer, community administrator, or a dressmaker of community gear or protocols, you are going to come away with a "big picture" realizing of the way smooth networks and their functions are built.
*Completely up-to-date content material with increased insurance of the themes of extreme significance to networking pros and scholars, together with P2P, instant, safety, and applications.
*Increased specialise in software layer concerns the place leading edge and interesting study and layout is at the moment the heart of attention.
*Free downloadable community simulation software program and lab experiments guide to be had.
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Extra info for Computer Networks: A Systems Approach (5th Edition) (The Morgan Kaufmann Series in Networking)
For example, if all you have are message stream and request/ reply channels, then it is tempting to use them for the next application that comes along, even if neither type provides exactly the semantics needed by the application. Thus, network designers will probably be inventing new types of channels—and adding options to existing channels—for as long as application programmers are inventing new applications. Also note that independent of exactly what functionality a given channel provides, there is the question of where that functionality is implemented.
Those nodes that are attached to at least two links run software that forwards data received on one link out on another. If organized in a systematic way, these forwarding nodes form a switched network. There are numerous types of switched networks, of which the two most common are circuit switched and packet switched. The former is most notably employed by the telephone system, while the latter is used for the overwhelming majority of computer networks and will be the focus of this book. ) The important feature of packet-switched networks is that the nodes in such a network send discrete blocks of data to each other.
We can think of the channel as being like a pipe connecting two applications, so that a sending application can put data in one end and expect that data to be delivered by the network to the application at the other end of the pipe. The challenge is to recognize what functionality the channels should provide to application programs. For example, does the application require a guarantee that messages sent over the channel are delivered, or is it acceptable if some messages fail to arrive? 7 Processes communicating over an abstract channel.