1.6 Layering Principle
Layering
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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