networking - Sliding window algorithm implementation -


i having trouble figuring how derive numbers solution question. following steps, numbers not come near of solution. can give concise step step way figuring out both problems. enter image description here

solution

enter image description here

part a

t = 0 rtt sender sends frames 0, 1 , 2 (theoretically) simultaneously.

t = 0.5rtt receiver receives frames 0,1 , 2. receiver updates lfr = 2, laf = 5. receiver sends ack each of 3 frames.

t = 1 rtt sender receives ack frames 0, 1, , 2, , sends out frames 3,4, , 5. sender updates lar = 2, , lfs = 5.

t = 1.5 rtt receiver receives frames 3 , 5. receiver updates lfr = 3, laf = 6. sends ack frame 3.

t = 2 rtt sender receives ack frame 3, , sends out frame 6. sender updates lar = 3, , lfs = 6.

t = 2.7 rtt sender times out on frame 4.

part b

t = 0 rtt sender sends frames 0, 1 , 2 (theoretically) simultaneously.

t = 0.5rtt receiver receives frames 0,1 , 2. receiver updates lfr = 2, laf = 5. receiver sends ack each of 3 frames.

t = 1 rtt sender receives ack frames 0, 1, , 2, , sends out frames 3,4, , 5. sender updates lar = 2, , lfs = 5.

t = 1.5 rtt receiver receives frames 3,4, , 5. receiver updates lfr = 5, laf = 8. sends ack each of frames received.

t = 2 rtt sender receives ack frame 5, , sends out frames 6,7, 8. sender updates lar = 5, , lfs = 8.

t = 2.5 rtt receiver receives frames 6,7, , 8. receiver updates lfr = 8, laf = 11. sends ack each of frames received.

t = 2.7 rtt sender times out on frame 4.


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