The OSI Layer MOdel

.The Seven OSI Model Layers
"Please Do Not Throw Sausage Pizza Away" - as told by GordoOSI Layer Function *Application Layer Serves as a window for applications to access net services. Handles general network access, flow control and error recovery.*Presentation Layer Layer is the network's translator. The redirector operates here. Determines format for data. Responsible for protocol conversion, translating and encrypting data, and managing data compression.*Session Layer Allows applications on two PC's to connect and establish a session. Provides synchronization between communicating computers.*Transport Layer Responsible for packet handling. Ensures error-free delivery. Repackages messages, divides messages into smaller packets, and handles error handling.*Network Layer Responsible for addressing, determining routes for sending, managing network traffic problems, packet switching, routing, data congestion, and reassembling data.*Data Link Layer Sends data frames from network layer to physical layer. Packages bits to frames. *LLC- Manages link control and defines SAP's (Service Access Points). *MAC- Communicates with adapter card. *Physical Layer Transmits data over a physical medium. Defines cables, cards, physical aspects.Additional notes:*LLC - (Logical Link Control) Upper sublayer of DLL - manages DL communication and defines the use of logical interface points - defined by 802.2 *MAC - (Media Access Control) Lower sublayer of DLL - provides shared access for the NIC Physical layer - is responsible for delivering error-free data between 2 computers - defined by 802.3, 802.4, 802.5, and 802.12