Notes_1 - INTERNETWORKING NOTES 1.5 THE OSI MODEL AND...

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INTERNETWORKING NOTES 1.5 THE OSI MODEL AND TCP/IP MODELS What is the OSI model and why is it important in understanding networking? What are the advantages of using a theoretical model to describe networking? What is the name of Layer 3 in the OSI model? Layer 5? Which OSI model layers typically correspond to the network architecture? How does the session ID differ from the port number? At which OSI model layer would you find a frame ? What is the difference between connectionless and connection-oriented services? OSI MODEL FACTS The Open Systems Interconnection (OSI) model is a theoretical way of classifying and talking about the complex process of sending data on a network. You should be familiar with the OSI model because it is the most widely used method for understanding and talking about network communications. However, remember that it is only a theoretical model that defines standards for programmers and network administrators, not a model of actual physical layers. Using the OSI model to discuss networking concepts has the following advantages: Provides a common language or reference point between network professionals Divides networking tasks into logical layers for easier comprehension Allows specialization of features at different levels Aids in troubleshooting Promotes standards of interoperability between networks and devices
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