Rivier college cs575 advanced lans chapter 6 logical link control
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Rivier College CS575: Advanced LANs Chapter 6: Logical Link Control PowerPoint PPT Presentation


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Rivier College CS575: Advanced LANs Chapter 6: Logical Link Control. IEEE 802 Protocol Layers Compared to OSI Model. Logical Link Control Services. Unacknowledged connectionless service Connection-mode service Acknowledged connectionless service. Logical Link Control (LLC) Primitives.

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Rivier College CS575: Advanced LANs Chapter 6: Logical Link Control

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Rivier CollegeCS575: Advanced LANsChapter 6: Logical Link Control

Logical Link Control


IEEE 802 Protocol Layers Compared to OSI Model

Logical Link Control


Logical Link Control Services

  • Unacknowledged connectionless service

  • Connection-mode service

  • Acknowledged connectionless service

Logical Link Control


Logical Link Control (LLC) Primitives

Logical Link Control


Logical Link Control (LLC) Primitives

Logical Link Control


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


LLC Classes available for a single station

Logical Link Control


LLC Protocol Data Unit Formats

Logical Link Control


LLC Protocol Data Units

Logical Link Control


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

Logical Link Control


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

Logical Link Control


Service Primitive Types

Logical Link Control


Time Sequence Diagrams for Service Primitives

Logical Link Control


Flow Control: Model of Frame Transmission

Logical Link Control


Stop-and-Wait Flow Control: Link Utilization

Logical Link Control


Sliding-Window Flow Control Process

Logical Link Control


Example of a Sliding-Window Protocol

* Error-detection technique requires an Error-Detecting Code (e.g., CRC)

Logical Link Control


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


Stop-and-Wait Automatic Repeat Request (ARQ)

Logical Link Control


Go-Back-N Automatic Repeat Request (ARQ)

Logical Link Control


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