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Congest oSlow start

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What is the effective throughput for transferring a 1600 KB file when TCP using slow start congestion control technique. Given round trip time 20 ms and Maximum segment size 800 bytes. Assume there are no packet losses, unlimited bandwidth, and receiver window size. Assume slow start begins initially with a congestion window size of 1.

Answer given = 8MBPS.
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Total No of MSS to send =  1600 KB/800 B = 2048 MSS

so In slow start it wil start with 800B/  1600B/  3200B/  6400B/ 12800B/ 51200B/ 102400B/ 204800B/ 409600B/ 819200B/ 1638400B 

Where 1638400B = 1600KB 

Total 10 RTT

hence total  time required is 20 ms *10= 200 ms

THROUGHPUT = Data Size/ Total Time

                        = 1600 KB/200 ms

                         =8 MBPS

HERE no need of threshold as buffer size and bandwidth is unlimited.

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