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0x400. NETWORKING > 0x410. OSI Model

OSI Model

When two computers talk to each other, they need to speak the same language. The structure of this language is described in layers by the OSI model. The OSI model provides standards that allow hardware, such as routers and firewalls, to focus on one particular aspect of communication that applies to them and ignore others. The OSI model is broken down into conceptual layers of communication. This way, routing and firewall hardware can focus on passing data at the lower layers, ignoring the higher layers of data encapsulation used by running applications. The seven OSI layers are as follows:

Physical layer This layer deals with the physical connection between two points. This is the lowest layer, whose primary role is communicating raw bit streams. This layer is also responsible for activating, maintaining, and deactivating these bit-stream communications.

  

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