37. Consider the following plot below of TCP window size as a function of time. Assuming TCP Reno is the protocol experiencing the behaviour shown above, answer the following questions. In all cases, you should provide a short discussion justifying your answer. a. Identify the intervals of time when TCP slow start is operating. b. Identify the intervals of time when TCP congestion avoidance is operating. c. After the 16th transmission round, is segment loss detected by a triple duplicate ACK or by a timeout?

37. Consider the following plot below of TCP window size as a function of time. Assuming TCP Reno is the protocol experiencing the behaviour shown above, answer the following questions. In all cases, you should provide a short discussion justifying your answer. a. Identify the intervals of time when TCP slow start is operating. b. Identify the intervals of time when TCP congestion avoidance is operating. c. After the 16th transmission round, is segment loss detected by a triple duplicate ACK or by a timeout?

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

Problem 1PE

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Concept explainers

Types Of Protocols

A network protocol is a collection of rules that governs the exchange of data between devices connected to the same network. In other words, network protocols are rules that specify how devices communicate or transfer data over a network. The sender and receiver systems must obey the standards to facilitate communication between them.

Question

37. Consider the following plot below of TCP window size as a function of time. Assuming TCP Reno
is the protocol experiencing the behaviour shown above, answer the following questions. In all
cases, you should provide a short discussion justifying your answer.
a. Identify the intervals of time when TCP slow start is operating.
b. Identify the intervals of time when TCP congestion avoidance is operating.
c. After the 16th transmission round, is segment loss detected by a triple duplicate ACK or by a
timeout?
d. After the 22nd transmission round, is segment loss detected by a triple duplicate ACK or by a
timeout?
e. What is the initial value of Threshold at the first transmission round?
f. What is the value of threshold at the 18th transmission round?
g. What is the value of threshold at the 24th transmission round?
h. During what transmission round is the 70th segment sent?
i. Assuming a packet lost is detected after the 26th round by the receipt of a triple duplicate
ACK, what will be the values of the congestion-window size and of Threshold?
45
40 -
35
30
25
20
15
10-
5-
2
4
6.
8.
10 12 14 16 18 20 22 24 26
Transmission round
Congestion window size (segments)

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TCP is a sliding window protocol. This means. а. there can be more than one segment "in flight" (sent but no ACK has been received) at a time. O b. the TCP retransmission timer slides up as ACKS are received. O c. there can only be one segment outstanding (sent but no ACK has been received) at at time.
Question 2 please (a,b,c,d included)
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Consider one TCP connection on a path with a bottleneck link with capacity L. We have a file of size F(assume F is a very large file size). If TCP segment size is B bytes, the two-way propagation delay is tp and connection is always in congestion avoidance phase, find the following: A. Maximum window size that TCP can achieve B. Average window size and average throughput in this TCP connection C. Time it will take from connection establishment to reaching the maximum window size.
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