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 college cs575 advanced lans chapter 6 logical link control

Rivier CollegeCS575: Advanced LANsChapter 6: Logical Link Control

Logical Link Control


Ieee 802 protocol layers compared to osi model

IEEE 802 Protocol Layers Compared to OSI Model

Logical Link Control


Logical link control services

Logical Link Control Services

  • Unacknowledged connectionless service

  • Connection-mode service

  • Acknowledged connectionless service

Logical Link Control


Logical link control llc primitives

Logical Link Control (LLC) Primitives

Logical Link Control


Logical link control llc primitives1

Logical Link Control (LLC) Primitives

Logical Link Control


Three llc protocols referred to as types of operation

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

LLC Classes available for a single station

Logical Link Control


Llc protocol data unit formats

LLC Protocol Data Unit Formats

Logical Link Control


Llc protocol data units

LLC Protocol Data Units

Logical Link Control


Examples of high level data link control hdlc operation

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

Logical Link Control


Examples of high level data link control hdlc operation1

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

Logical Link Control


Service primitive types

Service Primitive Types

Logical Link Control


Time sequence diagrams for service primitives

Time Sequence Diagrams for Service Primitives

Logical Link Control


Flow control model of frame transmission

Flow Control: Model of Frame Transmission

Logical Link Control


Stop and wait flow control link utilization

Stop-and-Wait Flow Control: Link Utilization

Logical Link Control


Sliding window flow control process

Sliding-Window Flow Control Process

Logical Link Control


Example of a sliding window protocol

Example of a Sliding-Window Protocol

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

Logical Link Control


Error control mechanisms

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

Stop-and-Wait Automatic Repeat Request (ARQ)

Logical Link Control


Go back n automatic repeat request arq

Go-Back-N Automatic Repeat Request (ARQ)

Logical Link Control


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