GATE CS 2014 Set 1 — Question 38
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Computer Networks → Data Link Layer → Efficiency Numericals
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Question
Consider a selective repeat sliding window protocol that uses a frame size of 1 KB to send data on a 1.5 Mbps link with a one-way latency of 50 msec. To achieve a link utilization of 60%, the minimum number of bits required to represent the sequence number field is ________.
Correct answer
5 to 5
Solution
Given:
Frame size bits.
Bandwidth bps.
Propagation time sec.
Utilization .Transmission time .Let be the sender window size.
Efficiency
So, the sender window size .In Selective Repeat (SR) protocol, the size of the sender window () and receiver window () are typically equal (). The sequence number space size () must satisfy:
The number of bits () required to represent the sequence numbers is:
bits.
Frame size bits.
Bandwidth bps.
Propagation time sec.
Utilization .Transmission time .Let be the sender window size.
Efficiency
So, the sender window size .In Selective Repeat (SR) protocol, the size of the sender window () and receiver window () are typically equal (). The sequence number space size () must satisfy:
The number of bits () required to represent the sequence numbers is:
bits.
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