Rivier college cs575 advanced lans chapter 6 logical link control
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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
Rivier CollegeCS575: Advanced LANsChapter 6: Logical Link Control

Logical Link Control



Logical link control services
Logical Link Control Services

  • Unacknowledged connectionless service

  • Connection-mode service

  • Acknowledged connectionless service

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 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






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




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