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Say the receiver host B, has a buffer size of 4500 bytes and 1500 bytes of received and unprocessed data. If the value of congestion window is 3500 bytes then what will be the size of the window for sender host A?( Marks: -0.33 )

  1.   3500 B
  2.   4500 B
  3.   4000 B
  4.   3000 B
    Explanation:
    The size of window is the smaller of the receiver and congestion window which is 3000B as congestion window is 3500 B and receiver window is 4500-1500 = 3000B

Can anyone please explain it in details about congestion window?

1 Answer

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So 1500B  has been revieved by reciever B, hence the buffer size decreases 4500-1500=3000B.  Now the TCP window size will be min (CnWd, RWnd)   ie  min (3500,3000)=  3000B. Hence option 4.

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