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Chabot College

This resource provides a fundamental overview of networking, detailing how various devices, including workstations and peripherals, communicate effectively using network protocols. It emphasizes the importance of standardization through the OSI Model, released by the ISO, which enables compatibility and interoperability among different network technologies. The OSI Model is divided into seven layers, each serving a unique purpose in data transmission. Additionally, the relationship between the OSI Model and the TCP/IP framework is discussed, crucial for understanding modern internet communication.

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Chabot College

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Presentation Transcript

  1. Chabot College ELEC 99.05 Ch 2 - OSI Model

  2. What is Networking? Networking - the interconnection of workstations, peripherals, terminals and other devices.

  3. Network Protocols In today’s networks, it is possible for different types of computers to communicate. Macs, PCs, and mainframes can all share devices, data, and information, as long as they all speak the same language, orprotocol.

  4. Network Protocols Protocol - a set of rules, or an agreement, that determines the format and transmission of data.

  5. The Internet Protocol All devices on the Internet “speak” the same protocol: theInternet Protocol, orIP. The Internet actually uses a group, or suite, of protocols calledTCP/IP which includes HTTP.

  6. The Internet Protocol

  7. Networking Growing Pains Emerging network technologies were built using different kinds of hardware and software. Many of the new network technologies were incompatible.

  8. Toward Standardization To address the problem, the International Organization for Standardization (ISO) researched leading networks schemes: • Digital’s DECnet • IBM’s SNA • DoD’s TCP/IP (non-proprietary)

  9. The ISO’s Standard The ISO recognized there was a need to create a network model that would help vendors create networks that would work compatibly and interoperably with other networks. In 1984, the ISO released their networking model.

  10. ISO’s OSI Reference Model A Layered Model: A mnemonic: All People Seem To Need Data Processing

  11. ISO’s OSI Reference Model A Layered Model: Another mnemonic: APresent Session Transports Network Data Physically

  12. ISO’s OSI Reference Model Open System Interconnection (OSI)

  13. Layer Functions

  14. 7 - Application Layer

  15. 6 - Presentation Layer

  16. 5 - Session Layer

  17. 4 - Transport Layer

  18. 3 - Network Layer

  19. 2 - Data Link

  20. Data Link Sublayers LLC (Logical Link Control) MAC (Media Access Control) IEEE 802 Extension to the OSI Model

  21. 1 - Physical Layer

  22. Media Layers

  23. Host Layers

  24. Devices at Layers

  25. Moving Data End System End System

  26. Peer-to-Peer Communication

  27. Data Encapsulation

  28. Data Encapsulation Example End System Intermediate Systems

  29. TCP/IP’s Model

  30. TCP/IP

  31. TCP/IP v OSI Model

  32. What you will study…

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