| Term | Definition |
|---|
| Open System Interconnect Model | Seven layer model that designates how software or hardware operating at that layer will act on the data packet being sent. The layers are application, presentation, session, transport, network, data link, and physical. The application block is the upper three layers: Application, Presentation and Session. The network bloc is the lower four layers: Transport, Network, Data Link, and Physical. A mnemonic device to remember the layers from the top down is "All People Seem To Need Data Processing." A mnemonic device to remember the layers from the bottom up is "Please Do Not Throw Sausage Pizza Away." |
| Application | The layer where the user can understand what's going on. This is where users can see files being saved or transferred across a network. |
| Presentation | The layer that translates or converts the data. This is where the data is compressed or encrypted if needed by one of the other levels below. |
| Session | The layer that sets up the flow control mechanism for the data to be transmitted. |
| Transport | The layer that actually sets up the transmission. At this layer the information is put into packets and then verified that it was successfully received. This layer uses the flow control that the Session layer set up and takes responsibility for the flow of data and making sure it arrives. |
| Network | The layer that address the packets so they know where to go. |
| Data Link | The layer that ensures that data gets from one place to another without a problem. There are two sublayers to this particular layer: Logical Link Control layer and Media Access Control layer. The Logical Link Control Layer provides the flow control mechanisms for sending the data out from one computer to another. This is the layer that is closest to the Network layer. The Media Access Control layer works along with the Logical Link Control layer by providing the physical (MAC) address that the data is being sent to. |
| Physical | The layer that determines the frequencies and voltages that are sent along the media with the data. This is where bits are sent along the cable. |
Combine with other sets
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