How two adjacent layers communicate in a layered network, Computer Networking

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How two adjacent layers communicate in a layered network? (or What do you mean by Service Access Point?)

In layered network, each layer has lots of entities and entities of layer 1 gives service to the entities of layer i+1. The services can be accessed by service access point (SAP), which has some address by which the layer i+1 will access the services given by layer.

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