asafdav2
Joined: 25 Mar 2006
Posts: 9
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 01 Sep 2006 12:54 help with computer networks question |
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a communication line is given, with congestion control mechanism on it that includes fast retransmit.
[a] ---- [b]
we'll assume side a only sends packets of size A [bytes], and that side b only sends packets of size B [bytes]. the line bandwidth is C [bytes per sec], and the propagation time is d [seconds]. acks from side b are sent inside the B sized packets. we'll assume that the sending window size on side a is W [bytes]. what is the minimum timeout length in side a that will allow continuos packets sending, if we can guarantee that out of every n packets sent, at least n-1 will arrive correclty (and at most 1 will drop)?
i dont know how to interpret the last sentense. without it, the answer is that the total time to send a packet and get an ack for it is (2*d + (A+B) / C). but what happens if there's a packet drop ?
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