CSE3213_03_LayeredArchitectureW2012 1.5

CSE3213_03_LayeredArchitectureW2012 1.5 - OSI Model:...

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21 OSI Model: Summary Why 7 Layers? physical and application layer = bottom and top data link layer bundles all link-dependent details network layer responsible for hop-to-hop routing transport layer responsible for end-to-end flow control provide some useful features; these can be easily provided in application layer Summary of Layers
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22 Why did OSI Model Fail in Practice? (1) Bad Timing although essential elements of OSI model were in place quickly, final standard (model + protocols) was not published until 1984 by the time it took to develop OSI protocol standards, TCP/IP network architecture emerged as an alternative for open system interconnection free distribution of TCP/IP as part of Berkeley UNIX system ensured widespread use and development of numerous applications at various academic institutions (2) Complexity and Inefficiency 7-layer OSI model was specified before there was much experience in
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CSE3213_03_LayeredArchitectureW2012 1.5 - OSI Model:...

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