Osi model
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The document discusses the Open Systems Interconnection (OSI) reference model, which breaks down network communication into seven layers. The layers are application, presentation, session, transport, network, data link, and physical. Data flows from the top application layer down to the physical layer before being transmitted, and vice versa when received. Each layer uses protocol data units to communicate with its peer layer on another device.
Osi model
- 2. Proprietary and Open systems International Organization for Standardization (ISO) Open System Interconnection (OSI) reference model
- 3. Introduction to OSI model Application Presentation Physical Data link Network Transport Session •Help break down network functions •Create standards for equipment manufacturing •Allows different types of network hardware and software to communicate •Allow vendors to focus in specialized areas of the network •All People Seems To Need Data Processing •Please Do Not Through Sausage Pizza Away
- 4. Understanding the layers of OSI Application Presentation Physical Data link Network Transport Session •Interface with applications •Provide network access to apps •“Generi-fies” the data •Encryption service •Start and End Sessions •Logically keep the session seperated •Dictates “HOW” the data is sent •Define well known services (ports) •Provide “Logical” Addressing •Find best path to a destination •Provide “Physical” Addressing •Ensure data is error-free •Provide access to the cables •Electrical signals, Ones and Zeros
- 5. Data flow in OSI Application Presentation Physical Data link Network Transport Session Application Presentation Physical Data link Network Transport Session Network 00101110101 Source Destination Data (Message) Segment Packet Frame Bits
- 6. Peer-2-Peer communication D7H7 D6H6 D5H5 D4H4 D3H3 D2H2 T2 11011101010101110001101 D7H7 D6H6 D5H5 D4H4 D3H3 D2H2 T 11011101010101110001101 Transmission medium Source Destination protocol data units(PDU)