OSI Model VS TCP/IP Model|| Difference Between them

The Open Systems Interconnection (OSI) model is a conceptual framework that divides network communications functions into seven layers. Sending data over a network is complex because various hardware and software technologies must work cohesively across geographical and political boundaries.

1. Dhaka International University Department of Computer Science and Engineering Course Name: Introduction to Computer & Information Technology Created By Suman Ahmed Saikan Lecturer Department of CSE Dhaka International University-DIU OSI Model and TCP/IP Model February 2, 2024 1

2. February 2, 2024 2 Outline

3. February 2, 2024 3 Introduction The Open Systems Interconnection (OSI) model is a conceptual framework that divides network communications functions into seven layers. Sending data over a network is complex because various hardware and software technologies must work cohesively across geographical and political boundaries. Benefits of OSI Model: Shared understanding of complex systems Faster research and development Flexible standardization

4. February 2, 2024 4 Layers of OSI Model Client Slide Server Side

5. February 2, 2024 5 OSI Model Application Layer Provide service to the end user. Determining the availability of the receiving program. Proxy firewall filtering. Presentation Layer Translating data from one format to another. Translation, compression, encryption/decryption techniques. Session Layer Manage & maintain interaction between communicating devices. Creating a connection between sender & receiver. Transport Layer Heart of OSI Model. Segmentation occurs in this layer. Uses TCP/IP or UDP protocol for faster transmission. Network Layer Manages devices addressing, routing and tracks the location of the devices. Data units are packets. Data Link Layer Reliable transmission of data, Sending error free data, check the frames are damage or not. Physical Layer Transmit & receive individual bits from one node to another.

6. February 2, 2024 6 OSI Model VS TCP/IP Model Application Layer Presentation Layer Session Layer Transport Layer Network Layer Data Link Layer Physical Layer Application Layer Transport Layer Internet Layer Network Access Layer TCP/IP Model OSI Model

7. February 2, 2024 7 Distinguish between two model TCP/IP Model OSI Model TCP refers Transmission Control Protocol & IP means Internet Protocol. OSI refers Open System Interconnection. Implementation of OSI Model Reference Model. It has only four layers. It has seven layers. It is model around which internet is developed. It is a theoretical model. It is more reliable. It is less reliable. TCP/IP follows horizontal approach. OSI follows a vertical approach. Protocol dependant standard. Protocol independent standard.

8. February 2, 2024 8 References https://www.javatpoint.com/osi-model https ://www.cloudflare.com/en-gb/learning/ddos/glossary/open-systems-interconnection-model-osi / https://www.geeksforgeeks.org/open-systems-interconnection-model-osi / https://www.geeksforgeeks.org/tcp-ip-model / https:// www.techtarget.com/searchnetworking/definition/TCP-IP https://www.fortinet.com/resources/cyberglossary/tcp-ip

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