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Network Models

* The five-layer model provides guidelines for the development of universally compatible networking protocols.

* The physical, data link, and network layers are the network support layers.

* The application layer is the user support layer.

* The transport layer links the network support layers and the user support layer.

* The physical layer coordinates the functions required to transmit a bit stream over a physical medium.

* The data link layer is responsible for delivering data units from one station to the next without errors.

* The network layer is responsible for the source-to-destination delivery of a packet across multiple network links.

* The transport layer is responsible for the process-to-process delivery of the entire message.

* The application layer enables the users to access the network.