Chapter 2 Network Models Copyright © The McGraw-Hill Companies‚ Inc. Permission required for reproduction or display. Chapter 2: Outline 2.1 Protocol Layering 2.2 TCP/IP Protocol Suite 2.3 OSI Model 1.# 1 Chapter 2: Objective The first section introduces the concept of protocol layering using two scenarios. The section also discusses the two principles upon which the protocol layering is based. The first principle dictates that each layer needs to have two opposite tasks
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definition for a model According to Wilson’s definition a model is the explicit interpretation of one’s understanding of a situation‚ or simply of one’s idea about that situation. It can be expressed in mathematics‚ symbols or words. But it is essentially a description of entities‚ process or attributes and the relationships between them. It may be prescriptive or illustrative‚ but about all‚ it must be useful. Describe the purpose and uses of models There are various use of models; here I am
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describes how women were “ornaments” that could be passed along to the men who held power. Models who wanted to make it on a billboard or a TV ad had to subject themselves to powerful men‚ who demanded sex in exchange for opportunity. Written in the 1970s‚ one can assume that conditions have improved and that the physical and sexual abuses faced by models have certainly improved. However‚ a 2015 article called “Model life: to call it indentured servitude is no exaggeration” by Rose Hackman states that’s
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Recovery Model in Marriage and Family Therapy The recovery model have created a wide spared international movement within the healthcare ranks‚ bringing its identity into a clearer focus through the lens of government funded agencies‚ health care communities‚ as well as other interested parties and groups in how they view mental illness and it’s diagnosis (Gehart‚ 2014). The recovery model ambition is to establish the tools and resources to restore a healthy and manageable way of living creating
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Analysis models are model used in software development to help in understanding the application area being addressed by a system‚ before the stages of system design and coding are reached. In another word‚ analysis models describe the data handled in an application and the various processes by which it is manipulated. Analysis and Design models fulfill the same needs and provide the same sorts of benefit. Software systems that both analysis and design models are supporting or interacting with
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whole attempt to formalize the definition of business models when he wrote that " "Business Model" is one of those terms of art that were central to the Internet boom: it glorifies all manner of half baked plans. All it really meant was how you planned to make money." In an abstract of his paper "A Mesoscopic Approach to Business Models: Nano Research on Management" published in "Economic Issues in China" Dr. Junyi Weng stated that "Business Model‚ a well known important and extensively used term
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Relational Model: Data Structure The relational database model consists of three parts: data structure (this section)‚ data integrity‚ and data manipulation. The data structure model defines how to represent data. Most basic to the data structure model is the relation which is illustrated below: A relation‚ which is the most basic part of the data structure model‚ has two parts: relation heading and relation body: * Relation Heading A relation heading is a set of (attribute‚ domain) pairs
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UNDERSTANDING THE OSI MODEL AND THE RELATIONSHIP WITH TCP/IP Table Of Contents Letter of Transmittal Abstract Table of Contents Written Presentation References Abstract The Open Systems Interconnection (OSI) model is a reference tool for understanding data communications between any two networked systems. It divides the communications processes into seven layers. Each layer both performs specific functions to support the layers above it and offers services to the layers below it. The
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SPIRAL MODEL The spiral model combines the idea of iterative development (prototyping) with the systematic‚ controlled aspects of the waterfall model. It allows for incremental releases of the product‚ or incremental refinement through each time around the spiral. The spiral model also explicitly includes risk management within software development. Identifying major risks‚ both technical and managerial‚ and determining how to lessen the risk helps keep the software development process under control
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Bohr and the Atomic Model Niels Bohr’s model of the hydrogen atom—first published 100 years ago and commemorated in a special issue of Nature—is simple‚ elegant‚ revolutionary‚ and wrong. Well‚ "wrong" isn’t exactly accurate—incomplete or preliminary are better terms. The Bohr model was an essential step toward an accurate theory of atomic structure‚ which required the development of quantum mechanics in the 1920s. Even in its preliminary state‚ the model is good enough for many calculations
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