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Understanding the OSI Data Link Layer: Media Access, Frame Structure, and Topologies

Chapter 7 delves into the essential functions of the Data Link Layer of the OSI model, elucidating its critical role in data transmission. Key topics include the preparation of data for network transmission, common media access control methods, and logical network topologies. The chapter also explores how packets are encapsulated into frames, detailing the generic structure of Layer 2 frames, including frame header and trailer fields such as addressing, Quality of Service (QoS), and protocol types. Gain insights into why data link layer protocols are vital for managing media access.

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Understanding the OSI Data Link Layer: Media Access, Frame Structure, and Topologies

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Presentation Transcript

  1. OSI Data Link Layer Network Fundamentals – Chapter 7

  2. OSI Reference Model Layer 2

  3. What will we learn from chapter 7? • Their role in data transmission • Prepare data for transmission on network media • Media access control methods • Common logical network topologies • Encapsulating packets into frames • Layer 2 frame structure - generic fields • Frame header and trailer fields: • addressing • QoS • Type of protocol • Frame Check Sequence

  4. Data Link Layer – Accessing the Media

  5. Data Link Layer – Accessing the Media Why Data Link layer protocols required to control media access

  6. Data Link Layer – Accessing the Media

  7. Data Link Layer – Accessing the Media

  8. Data Link Layer – Accessing the Media

  9. Media Access Control Techniques Controlling access to the media

  10. Media Access Control Techniques Two media access control methods for shared media and their basic characteristics

  11. Media Access Control Techniques Full Duplex and Half Duplex as it relates to Media Access Control for non-shared media

  12. Media Access Control Techniques

  13. Media Access Control Techniques

  14. Media Access Control Techniques

  15. Media Access Control Techniques

  16. Media Access Control Techniques

  17. Media Access Control Addressing and Framing Data

  18. Media Access Control Addressing and Framing Data

  19. Media Access Control Addressing and Framing Data The role of addressing in the Data Link layer - cases where addresses are needed – or not needed

  20. Media Access Control Addressing and Framing Data

  21. What did I Learn from chapter 7? • Their role in data transmission • They prepare data for transmission on network media • Media access control methods • Common logical network topologies • Encapsulating packets into frames • Layer 2 frame structure - generic fields • Frame header and trailer fields: addressing QoS Type of protocol Frame Check Sequence

  22. Data Link Layer Next OSI Physical Layer

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