August
1999 QUESTION 4 Total Marks: 20 Marks |
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| (a) | What is flow control and why is it needed in
data communications.
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[2] |
| (b) | How does the stop and wait protocol work?
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[4] |
| (c) | Another flow control protocol is known as the
sliding window protocol. How does this scheme operate? Explain your answer with the aid of
an example and diagrams.
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[8] |
| (d) | Flow control is a function of which layer in
the OSI reference model? Describe the other main functions of this layer, and the main
service it provides.
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[6] |