CSE3213_03_LayeredArchitectureW2012 1.1

CSE3213_03_LayeredArchitectureW2012 1.1 - Layering...

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1 Layered Architectures and Applications CSE 3213, Winter 2012 Instructor: Dusan Stevanovic Required reading: Garcia 2.1, 2.2, 2.3
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3 Why Layering?! Alice wants to send a mail to Bob and a parcel to John. City A City C Alice drops off both at the same Post Office. Post Office looks at the addresses ( city names!!! ) and arranges for proper transportation. City B Post Office performs final delivery based on the street and personal names . Montreal London Paris
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4 Why Layering?! (cont.) Telnet FTP NFS Packet radio Coaxial cable Fiber optic Application Transmission Media HTTP Telnet FTP NFS Packet radio Coaxial cable Fiber optic Application Transmission Media HTTP Intermediate layer No Layering each new application has to be re- implemented for every network technology!
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Unformatted text preview: Layering intermediate layer(s) provide a unique abstraction for various network technologies 5 Why Protocol Layering? 1) modularity one problem is decomposed into a number of smaller more manageable subproblems more flexibility in designing , modifying and evolving computer networks 2) functionality reuse a common functionality of a lower layer can be shared by many upper layers A monolithic network design that uses a single large body of hardware and software to meet all network requirements can quickly become obsolete and also is extremely difficult and expensive to modify. Layered approach accommodates incremental changes much more rapidly. Why Layering?! (cont.)...
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CSE3213_03_LayeredArchitectureW2012 1.1 - Layering...

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