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.How long does it take before the first full window can be sent?

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Consider the effect of using slow start on a line with a 10-msec round-trip time and no congestion. The receive window is 24 KB and the maximum segment size is 2 KB.How long does it take before the first full window can be sent?

  1.   40 msec
  2.   80 msec
  3.   50 msec
  4.   30 msec

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currect window size is 24KB ,so threshold is 12 KB

2KB -> 4KB -> 8KB -> 12KB (thrshold)-> 14->16->18->20->22->24

9 RTTs are required..

am i correct or wrong..?

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