ITM 600 Lecture Notes - Lecture 3: Osi Model, Access Network
16 Apr 2017
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Document Summary
Top down network design: methodology for designing networks that begins at the upper layers of the osi model, before moving to the lower layers. Focuses on applications, sessions and data transport before routers, switches and media at lower layers. Osi model review,: 7 layers physical, datalink, network, transport, session, Connect the dots method is a bottom up method is used when all the customers application and goals are known. Most customers have a desired service level, which is a required level of network performance. Must make tradeoffs before choosing any physical devices or media. Structured system analysis; designed in top down sequence, focus placed on data flows and data types and processes that access or change the data. Logical made before physical, logical is basic building blocks and structure of the system whereas physical is the devices and the specific technologies. Sdlc; system is planned, created, tested and optimized.
