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.
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