Lecture 01 - Communication Models

Lecture 01 - Communication Models - Communication Models...

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Unformatted text preview: Communication Models CNIT 24000 Data CNIT 24000 Data Communications & Communications & Networks Networks Administrivia Course Textbook Laboratory University Holiday Questions? 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 Describe…without a reference model 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 Communication Models OSI TCP/IP IPO Top-Down ottom p Bottom-Up 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 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 OSI Model Layers OSI Mnemonic How do you remember the layer names and order?...
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This note was uploaded on 03/26/2010 for the course CIT 240 taught by Professor None during the Spring '10 term at Purdue.

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Lecture 01 - Communication Models - Communication Models...

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