A Quick Breakdown of the OSI Model Layers and Services
|Application Layer||The Application Layer supports user and application tasks and overall system management, including resource sharing, file transfers, remote file servers and database and network management.|
|Presentation Layer||The Presentation Layer translates and converts transmitted encoded data into formats that can be understood and manipulated by users.|
|Session Layer||The Session Layer establishes and controls system-dependent aspects of communication sessions provided by the Transport Layer and the logical functions running under the operating system in a participating node.|
|Transport Layer||The Transport Layer provides end-to-end control of a communication session once the path has been established, which enables the reliable and sequential exchange of data independent of both the systems that are communicating and their locations in the network.|
|Network-Control Layer||The Network-Control Layer addresses messages, sets up the path between communicating nodes, routes messages across intervening nodes to their destinations and controls the flow of messages between nodes.|
|Data-Link Layer||The Data-Link Layer establishes an error-free communication path between network nodes over the physical channel, frames messages for transmission, checks the integrity of received messages, manages access to and use of the channel and ensures the sequence of transmitted data.|
|Physical Layer||The Physical Layer defines the electrical and mechanical aspects of interfacing to a physical medium for transmitting data, as well as setup, maintenance and disconnection of physical links. This layer includes the software driver for each communications device, plus the hardware itself—interface devices, modems and communications lines.|
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