Phases of TCP congestion control. Consider the figure below, which plots the evolution of TCP's congestion window at the beginning of each time unit (where the unit of time is equal to the RTT); see Figure 3.53 in the text. In the abstract model for this problem, TCP sends a "flight" of packets of size cwnd at the beginning of each time unit. The result of sending that flight of packets is that either (i) all packets are ACKed at the end of the time unit, (ii) there is a timeout for the first packet, or (iii) there is a triple duplicate ACK for the first packet. At the end of which units of time does TCP detect a triple-duplicate-ACK? Congestion window size (in segments) 40 35 20 10 5 0 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 Time unit (in RTT)
Phases of TCP congestion control. Consider the figure below, which plots the evolution of TCP's congestion window at the beginning of each time unit (where the unit of time is equal to the RTT); see Figure 3.53 in the text. In the abstract model for this problem, TCP sends a "flight" of packets of size cwnd at the beginning of each time unit. The result of sending that flight of packets is that either (i) all packets are ACKed at the end of the time unit, (ii) there is a timeout for the first packet, or (iii) there is a triple duplicate ACK for the first packet. At the end of which units of time does TCP detect a triple-duplicate-ACK? Congestion window size (in segments) 40 35 20 10 5 0 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 Time unit (in RTT)
Computer Networking: A Top-Down Approach (7th Edition)
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Chapter1: Computer Networks And The Internet
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Transcribed Image Text:Phases of TCP congestion control. Consider the figure below, which plots the
evolution of TCP's congestion window at the beginning of each time unit (where
the unit of time is equal to the RTT); see Figure 3.53 in the text. In the abstract
model for this problem, TCP sends a "flight" of packets of size cwnd at the
beginning of each time unit. The result of sending that flight of packets is that
either (i) all packets are ACKed at the end of the time unit, (ii) there is a timeout
for the first packet, or (iii) there is a triple duplicate ACK for the first packet.
At the end of which units of time does TCP detect a triple-duplicate-ACK?
Congestion window size (in segments)
40
35
25
20
10
5
0
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
Time unit (in RTT)
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Follow-up Questions
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Follow-up Question
A. During which of the following intervals of time is TCP performing slow start*?
B. During which of the following intervals of time is TCP performing congestion avoidance
C. At the end of which unit(s) of time does TCP detect a loss via timeout
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