Although slow start with congestion avoidance is an effective technique for copi

Question

Although slow start with congestion avoidance is an effective technique for coping with congestion, it can result in long recovery times in high-speed networks, as this problem demonstrates.

A) Assume a round-trip delay of 60 msec (about what might occur across the continent) and a link with an available bandwidth of 1 Gbps and a segment size of 576 octets. Determine the window size needed to keep the pipeline full and the a worst case estimate of the time it will take to reach that window size after a timeout occurs on a new connection using Jacobson’s slow start with congestion avoidance approach.

B) Repeat part (a) for a segment size of 16 kbytes.

Explanation / Answer

Round-trip delay = 60msec

Bandwidth = 1 Gbps

Segment size = 576 octets

Window size = (Bandwidth * round - trip time)/(segment size * window )

Window size = (109 × 0.06)/(576 × 8) = 13,000 segments

B) If segment size of 16 kbytes then

Window size = (109 × 0.06)/(16,000 × 8) = 460 segments

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