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

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Presentation transcript:

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

IEEE 802 Protocol Layers Compared to OSI Model Chapter 6 Logical Link Control

Logical Link Control Services Unacknowledged connectionless service Connection-mode service Acknowledged connectionless service Chapter 6 Logical Link Control

Logical Link Control (LLC) Primitives Chapter 6 Logical Link Control

Logical Link Control (LLC) Primitives Chapter 6 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 Chapter 6 Logical Link Control

LLC Classes available for a single station Chapter 6 Logical Link Control

LLC Protocol Data Unit Formats Chapter 6 Logical Link Control

LLC Protocol Data Units Chapter 6 Logical Link Control

Examples of High-Level Data Link Control (HDLC) Operation Chapter 6 Logical Link Control

Examples of High-Level Data Link Control (HDLC) Operation Chapter 6 Logical Link Control

Service Primitive Types Chapter 6 Logical Link Control

Time Sequence Diagrams for Service Primitives Chapter 6 Logical Link Control

Flow Control: Model of Frame Transmission Chapter 6 Logical Link Control

Stop-and-Wait Flow Control: Link Utilization Chapter 6 Logical Link Control

Sliding-Window Flow Control Process Chapter 6 Logical Link Control

Example of a Sliding-Window Protocol * Error-detection technique requires an Error-Detecting Code (e.g., CRC) Chapter 6 Logical Link Control

Error Control Mechanisms 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. * Error-detection technique requires an Error-Detecting Code (e.g., CRC) Chapter 6 Logical Link Control

Stop-and-Wait Automatic Repeat Request (ARQ) Chapter 6 Logical Link Control

Go-Back-N Automatic Repeat Request (ARQ) Chapter 6 Logical Link Control