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Rivier College CS575: Advanced LANs Chapter 6: Logical Link Control
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  1. Rivier CollegeCS575: Advanced LANsChapter 6: Logical Link Control Logical Link Control

  2. IEEE 802 Protocol Layers Compared to OSI Model Logical Link Control

  3. Logical Link Control Services • Unacknowledged connectionless service • Connection-mode service • Acknowledged connectionless service Logical Link Control

  4. Logical Link Control (LLC) Primitives Logical Link Control

  5. Logical Link Control (LLC) Primitives Logical Link Control

  6. Three LLC Protocols(referred to as types of operation) • Type 1 operation supports unacknowledged connectionless service • Type 2 operation supports connection-mode service • Type 3 operation supports acknowledged connectionless service Logical Link Control

  7. LLC Classes available for a single station Logical Link Control

  8. LLC Protocol Data Unit Formats Logical Link Control

  9. LLC Protocol Data Units Logical Link Control

  10. Examples of High-Level Data Link Control(HDLC) Operation Logical Link Control

  11. Examples of High-Level Data Link Control(HDLC) Operation Logical Link Control

  12. Service Primitive Types Logical Link Control

  13. Time Sequence Diagrams for Service Primitives Logical Link Control

  14. Flow Control: Model of Frame Transmission Logical Link Control

  15. Stop-and-Wait Flow Control: Link Utilization Logical Link Control

  16. Sliding-Window Flow Control Process Logical Link Control

  17. Example of a Sliding-Window Protocol * Error-detection technique requires an Error-Detecting Code (e.g., CRC) Logical Link Control

  18. Error Control Mechanisms * Error-detection technique requires an Error-Detecting Code (e.g., CRC) • Two Types of Possible Errors: • Lost PDU • Damaged PDU (some of the bits have been altered during transmission) • Methods of Error Control: • Error detection (the receiver detects errors and discards PDUs) • Positive acknowledgement is sent confirming error-free PDUs received • Retransmission after timeout • Negative acknowledgement and retransmission • Automatic Repeat Request (ARQ) turns an unreliable data link into a reliable one. Logical Link Control

  19. Stop-and-Wait Automatic Repeat Request (ARQ) Logical Link Control

  20. Go-Back-N Automatic Repeat Request (ARQ) Logical Link Control