ELEC2 - Lecture 1
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This document provides an overview of the Open Systems Interconnection (OSI) model, which defines 7 layers of networking architecture: 1) Physical layer - Defines physical interface and data transmission 2) Data-link layer - Provides error-free transfer of data frames between devices 3) Network layer - Determines data transmission path based on network conditions 4) Transport layer - Ensures reliable delivery of packets in proper order 5) Session layer - Enables applications to establish communication sessions 6) Presentation layer - Translates data between systems for encryption and compression 7) Application layer - Provides interfaces for programs to access network services
ELEC2 - Lecture 1
- 1. Elective 2 – Windows Server ManagementBy: Aaron Angeles
- 3. Multimedia – OSI Layersmedia\2276_1_A_OSI.htmOSI
- 4. Begins by 1978to define a unifying standard for the architecture of networking systemsInternational Telegraph and Telephone Consultative Committee and International Organization for Standardization (ISO)Officially rolled out by ISO as Open Systems Interconnection model by 1984.OSI Layers
- 5. OSI Layers7 Layers:7 - Application6 - Presentation5 - Session4 - Transport3 - Network2 - Data-Link1 - Physical“All PeopleSeem To Need Data Processing”
- 6. Each layer defines networking tasksEach layer communicates with the layers above and below itLayer 7 provides services for programs to gain access to the networkLayers 1 & 2 define the network’s physical media and related tasksOSI
- 7. Application Layer ( Layer 7)Provides an entrance point for programs (e.g. web browsers, e-mail system) to gain network servicesRepresent application programming interfaces (APIs) that developers can use to perform network functions when building applicationsOSI
- 8. Presentation (Layer 6)Translates data between computing systems on a networkPerforms: – data encryption– data compression– data conversionOSI
- 9. Session (Layer 5)Enables two application to create a persisten communication connections.Ensures that both sender and receiver are ready to communicateOSI
- 10. Transport (Layer 4)Ensures packets are delivered in order in which they are sent without loss or duplication.On the sending side, this layer is responsible for braking down larger messages into smaller packets for transmissionOn the receiving end, this layer is responsible for reassembling the packets into a single message to pass up to the upper layerOSI
- 11. Network (Layer 3)Determines the physical path of the data to be transmitted based on the network conditions, priority of server and other factors.The only layer that uses logical networking and can move packets between different networks.OSI
- 12. Data-link (Layer 2)Provides error free transfer of data frames from one computer to another over the physical layer. The Media Access Control (MAC) address of the network card exists at this layer that is added to the packet to create a frame.OSI
- 13. Physical Layer (Layer 1)Establishes the physical interface and mechanisms for placing a raw stream of data bits on the network cabling.OSI
- 14. TCP/IP in Relation with OSIOSI