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CISSP in 21 Days - Second Edition by M. L. Srinivasan

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Open System Interconnect (OSI) model

Open System Interconnect (OSI) is an International Organization for Standardization (ISO) layered architecture standard that defines a framework for implementing protocols in seven layers.

Note

A protocol is a communication standard that defines rules pertaining to syntax, semantics, and synchronization for communications.

The seven layers in the OSI model are represented as a top-down list in the following illustration:

Open System Interconnect (OSI) model

Layers 7, 6, 5, and 4 work at the host (computer) level and are sometimes called host layers, whereas layers 3, 2, and 1 are related to transmission through the media and are called media layers ...

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