An Introduction to Network Architectures and Protocols
نویسنده
چکیده
for the reader who is unfamiliar with computer networks, to prepare him for reading the more detailed technical literature on the subject. The approach here is to start with an ordered list of the functions that any network must provide in tying two end users together, and then to indicate how this leads naturally to layered peer protocols out of which the architecture of a computer network is constructed. After a discussion of a f e w block diagrams of private (commercially provided) and public (common carrier) networks, the layer and header structures of SNA and DNA architectures and the X.25 interface are briefly described. Ever since computer users began accessing the machine resources from remote terminals over twenty-five years ago, computer networks have become more versatile, more powerful, and, inevitably, more complex. Today's computer network^"^ range all the way from a single small processor that supports one or two terminals to complicated interconnections in which tens of processing units of various sizes are interconnected to one another and to thousands of terminals, often with various forms of special multiplexors and controllers in between. As this evolution has proceeded, so have attempts to replace ad hoc methods of network design with systematic ways of organizing , understanding, and teaching about computer network details. Today there is a way of looking at networks in terms of layered architectures that all the experts use, but which is replete with its own jargon, and unclear and seemingly conflicting definitions, which often make it difficult to follow what is going on. Copying is permitted without payment of royalty provided that (1) each reproduction is done without alteration and (2) the Journal reference and IBM copyright notice are included on the first page. The title and abstract may be used without further permission in computer-based and other information-service systems. Permission
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عنوان ژورنال:
- IBM Systems Journal
دوره 18 شماره
صفحات -
تاریخ انتشار 1979