Introduction to OSI MODEL
- 2. OSI MODEL Presented by : Sadia Rashid
- 3. Contents What is the history of OSI Model? What is OSI Model ? The7 layers of OSI Model OSI model is the backbone of the networking and networking decrease the communication gap
- 4. History of OSI Model Data in the communication devices needed to reboot when communicated with device of different architecture. Then ISO developed a standard called OSI model. OSI was made in 1983 to increase communication standard OSI model is the backbone of the networking and networking decrease the communication gap
- 5. What is OSI Model ? Stands for Open System Interconnection. Conceptual frame work used to describe networking. It is imaginary and describe set of rules. It tells how data is communicated.
- 6. Layers Of OSI Model Application Presentation Session Transport Network Data link Physical OSI model is the backbone of the networking and networking decrease the communication gap
- 7. Division of Layers Application Layer Presentation Layer Session Layer Transport Layer Network Layer Data Link Layer Physical Layer Upper Layer Lower Layer Middle Layer
- 8. Application Layer Consist of network aware application consist of software that interact one to another pc The main purpose of this is to provide File Transfer Mail Services Directory Services OSI model is the backbone of the networking and networking decrease the communication gap
- 9. Presentation Layer It performs Reformatting Compression Encryption OSI model is the backbone of the networking and networking decrease the communication gap
- 10. Session Layer It controls the communication It establishes, manages and terminates user connection It is a exchange of messages between computers It synchronizes the user task OSI model is the backbone of the networking and networking decrease the communication gap
- 11. Transport Layer Controls the flow of data Error checking is done Segmentation and fragmentation of data Sequencing of data End to end delivery of data OSI model is the backbone of the networking and networking decrease the communication gap
- 12. Network Layer Responsible for establishing, maintaining and terminating network connections Finds the shortest path to destination network Routing OSI model is the backbone of the networking and networking decrease the communication gap
- 13. Data Link Layer Responsible for reliability of physical link established on layer 1. Framing Flow control of data Access Control OSI model is the backbone of the networking and networking decrease the communication gap
- 14. Physical Layer Bottom layer of model. It consist of physical part of network and perform following tasks Characteristics of Media Representation of bits data rate Transmission Mode OSI model is the backbone of the networking and networking decrease the communication gap
- 15. Over View • Application layer enables user to access the network. • Presentation layer perform data reformatting and encryption of data. • Session layer establish manages and terminates connection. OSI model is the backbone of the networking and networking decrease the communication gap
- 16. ++ Transport layer divides large messages into small packets. Network layer determines logical path to transfer data. Data Link Layer converts small packets into frames and control the flow of data Physical Layer defines how data is transmitted and control how a stream of bits ks sent and received over physical medium. OSI model is the backbone of the networking and networking decrease the communication gap
- 17. OSI model is the backbone of the networking and networking decrease the communication gap