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OSI Model Explained | Open System Interconnection Model | Networking Tutorial |

In this presentation on what is an OSI model?, we will understand how our system, smartphones, etc. share the different formats of data and information over the network channel. <br>

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OSI Model Explained | Open System Interconnection Model | Networking Tutorial |

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  1. What’s In It For You? • What Is an OSI Model? • Structure of the OSI Model • Layers of an OSI Model

  2. What Is an OSI Model?

  3. Click here to watch the video

  4. What Is an OSI Model? Communication Channel OSI Model – Layer Structure System 1 System 2

  5. What Is an OSI Model? • The OSI model or Open System Interconnection model is a specifically designed set of protocols that governs the communication channels through which network devices share information and data. • This task of sharing information is divided among the 7 layers of the OSI model for microlevel network communication. Data Share Layer Format

  6. Layers of OSI Model?

  7. Layers Of OSI Model 7 Application Layer Presentation Layer 6 Host Layers Session Layer 5 Transport Layer 4 Network Layer 3 Data Link Layer 2 Network Layers Physical Layer 1

  8. Layer Information

  9. Layer Information Layer Function Data Format Application Layer Data Applications access network services Presentation Layer Data Encryption and Compression of data Session Layer Data Connection management b/w nodes Transport Layer Segment Maintains data flow during transmission Network Layer Packet Determine the path for data transfer Data Link Layer Frame Connect physical nodes for transfer Physical Layer Bit Transfer raw bits using physical mode

  10. Layers Of OSI Model Application Layer 7 Presentation Layer 6 Session Layer 5 Transport Layer 4 Top to Bottom Network Layer 3 Data Link Layer 2 Physical Layer 1

  11. Application Layer • This layer acts as an interface for the user and the application being accessed. • It manages the protocols required by the application needed to present the data to the user. • They apply the HTTP & SMTP protocols for the data for transmission.

  12. Presentation Layer • Performs the task of converting data into an uncomplicated form for the application layer. • Is also responsible for encrypting and decrypting data when sharing and receiving data. • Also execute the task of compressing the data for transmission to the Session layer. Shopping Conversion Encryption 1010110101 #2#A@E$ Compress Data

  13. Session Layer • This layer controls and maintains connections b/w devices. • It can also establish and terminate sessions. • Also checks the authenticity and provides recovery options in case of network failure for the active session. Authentication Data Recovery

  14. Q1. What is the main action that takes place at the Presentation Layer? • Data Segmentation • Encryption of data • Framing of data • Bit conversion of data

  15. Transport Layer Received Data UDP | Data TCP | Data • This layer performs the task of segmenting the data for proper transmission of data packets. • Provides the data packets with the port number for identification, like UDP & TCP. Data Segments

  16. Transport Layer This layer also overlooks the data transfer and maintains the flow of the data being shared between devices. Flow Control 50 Mbps 50 Mbps 10 Mbps Flow change Client Server

  17. Network Layer Data Segments IP Address • This is layer responsible for sending the received segments and providing them with the destination address. • This layer also ensure that the data packets transmits through the best possible route. • This layer also uses the IP and IPv6 protocols. Data Packets 2 Client Devices 2 1

  18. Data-Link Layer Data Packets • This layer maintains communication b/w two devices on the same network. • Divided into two sublayers: • Medium Access control(MAC): • Controls how devices establish the connection. • Logical Link control(LLC): • Identifies the address and provide flow control. MAC Address Data Packets MAC Address Data Frame Shared over the network Physical Layer

  19. Q2. Which layer includes the MAC sub-layer in the OSI model? • Application Layer • Session Layer • Data-Link Layer • Transport Layer

  20. Physical Layer Data Frame • This layer controls how the data is transferred over the physical medium. • It also converts the frames from the Data-link layer into bits of 1’s and 0’s. • Also maintains and performs network-related protocols that can be applied over different network modes. Bits 1’s & 0’s Wired Medium Wireless Medium

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