A Roaming Profile Is Stored On A Network Server

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Methods to ensure that network transmissions are received correctly and by the right recipient How the physical transmission media is arranged and connected

How to ensure that network devices maintain a proper rate of data flow How bits are represented on the network media

The OSI model isn’t a product. It’s just a conceptual framework you can use to better understand the complex interactions taking place among the various devices on a network. It doesn’t do anything in the communication process; appropriate software Comptia Security and hardware do the actual work. The OSI model simply defines which tasks need to be done and which protocols will handle those tasks at each of the seven layers of the model. The seven layers are as follows:

Application (layer 7) Presentation (layer 6) Session (layer 5)

Transport (layer 4) Network (layer 3) Data-Link (layer 2) Physical (layer 1)

You can remember the seven layers from top to bottom using a handy mnemonic, such as “All People Seem To Need Data Processing.”

Each of the seven layers has a distinct ...
... function, which we’ll explore a little later in the chapter.

The True IP Protocol Suite

There is another model to represent these same concepts that is truly what the Internet was built upon. The model is known by a few names, including the TCP/IP model, the IP model, or the DoD model (after its designers, the U.S. Department of Defense). The TCP/IP model, as we’ll call it, contains only four layers:

Application

Transport (sometimes called Host to Host)

Internet

Link (also called Network Access)

This model was the one originally used for the design of the Internet. You won’t encounter this model on the 70-642 exam, but as a network administrator,CCNA Certification you should know that this model exists when you hear your peers talking about it.