Lecture 01 - Communication Models

Lecture 01 - Communication Models - Communication Models...

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Communication Models CNIT 24000 Data Communications & Networks
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Administrivia Course Textbook Laboratory University Holiday Questions?
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Objectives Describe the need for communications models Identify the most useful models for data communications and networking discussions Elaborate on those models Use these models as a foundation for future discussions
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Describe…without a reference model
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Why do we need a model? Describe communications using defined terms Define interactions between systems Compare and contrast systems based on like terminology Create layered approach for protocol development and discussions
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Communication Models OSI TCP/IP IPO Top-Down Bottom-Up
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Open System Interconnection (OSI) Officially, ISO Standard 7498 ITU-T specifies X.200-X.299 Recommendations Defines 7 layers in order to describe end to end communications between any two systems Provides open interconnections between layers, such that multi-vendor environments can be supported. “Open” network computing was initially resisted by incumbent vendors
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OSI Model – Rules for Communication The communication between layers is handled in a specified (defined) manner Each layer is only able to communicate with its adjacent layers Each layer relies on the layers below it to perform their specified function Each layer relies on the layers above it to perform their specified function
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OSI Model Layers
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OSI Mnemonic How do you remember the layer names and order? Bottom-Up Please Do Not Throw Sausage Pizza Away Please Do Not Tell Sales People Anything Please Do Not Take Sales People’s Advice Top-Down All People Seem To Need Data Processing
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OSI Model: Physical Layer
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