Introduction to Data Communications (S1, 2014)

Data Link Control Protocols

Lecture Material

Lecture Notes: View, Print, Source
Stop and Wait Flow Control calculator - set parameter values for links, devices and traffic, and automatically calculate the throughput and efficiency of stop-and-wait flow control
Sliding Window Flow Control - two examples of sliding window flow control with different maximum window sizes, W. View
Sliding Window Examples - example questions on sliding windows. See the notes for the answers. View, Print, Source
Flow Control Examples - example questions (with answers) on flow control efficiency. View, Print, Source

Readings

Stallings: chapter 7
Forouzan: chapter 11
Kurose: none

Videos

This year: Need for Flow and Error Control, Stop-and-wait Flow Control, Stop-and-wait Performance Example, Sliding Window Flow Control, Sliding Window Efficiency, Error Control
Last year: Part 1, Part 2, Part 3, Part 4, Part 5

Notes

Notes from the lecture are below. Hover over the image to see a description; right-click and view the image to zoom in. Alternatively you can download a zip archive of all the image or a printable PDF of the notes.

Frame Structure with Header, Data and Trailer Stop-and-wait Flow Control Performance Stop and Wait Flow Control Calculations Sequence Number Wrapping Sliding Window Flow Control Example Stop and Wait ARQ with Lost DATA Stop and Wait ARQ with Lost ACK Go-Back-N ARQ Selective-Reject ARQ Maximum Window Size Frame Overheads - Larger Data is Better Frame Retransmission - Smaller Data is Better Frame Buffering - Smaller Data is Better Timeout Interval Examples Sliding Window Quiz Answer

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