1.6 Layering Principle


  • E.x. flights: google flights --> airlines (abstract the details of each airlines)

  • E.x. postal service

    • Mail

    • Postal service

    • Medias

    • Mailman

  • Can improve each layer independently over time (the interface is the same)

  • E.x. computer system

    • Breakdown into functional components, each with well-defined roles

    • Clear separations of concerns

    • Each can be improved, updated over time

  • Break the layers boundary only if needed

Reasons for layering

  • p2p: specific to layered communication systems

    • 4-layer: each layer communicate with its peer on the another system, using the delivery service provided by the layers below

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