Chapter Summary

The OSI model is a conceptual model that defines seven layers. Each of these layers performs a specific function that plays an important part in the end-to-end communication between two devices. The model allows us to relate the function of a certain protocol or service to a specific function of the model. For example, IP is responsible for the discovery and establishment of routes through the network. Therefore, it is reasonable to assume that IP is a network-layer protocol because such functions are performed at the network layer. The ability to draw parallels like this can be a useful aid to understanding networking from both conceptual and practical levels.

Because the OSI model defines the functions that are performed at ...

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