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 units of time does TCP detect a triple-duplicate-ACK*?

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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Question 6
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.
Congestion window size (in segments)
40
35
30
25
20
15
10
5
0
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
Time unit (in RTT)
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 units of time does TCP detect a triple-duplicate-ACK*?
D.
At the end of which unit(s) of time does TCP detect a loss via timeout*?
Transcribed Image Text:Question 6 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. Congestion window size (in segments) 40 35 30 25 20 15 10 5 0 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 Time unit (in RTT) 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 units of time does TCP detect a triple-duplicate-ACK*? D. At the end of which unit(s) of time does TCP detect a loss via timeout*?
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