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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Under what circumstances may coarse-grained timeouts still occur in TCP even when the fast retransmit mechanism is being used?
UDP and TCP use one’s complement for the checksum. Suppose you have the flowing four 8-bit data in a datagram: 10011011, 01011100, 11001101. 10101001 a) What is the one’s complement of the sum of the four? Show your work. b) Is it possible that a 1-bit error will go undetected? Is it possible that a 2-bit error will go undetected?
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Does this make sense to you, or do you believe it to be incorrect? Consider the most recent SampleRTT on a TCP connection to be one second. In order for the connection to be deemed active and functioning, the current TimeoutInterval value must be greater than one second.
Is this accurate or false? Assume that the most recent SampleRTT on a TCP connection is one second. The connection's current TimeoutInterval value must be greater than one second.
Assume that a TCP process A first measures the actual round trip time to TCP process to be 30 ms, and A thus sets its estimated round trim time to be 30 ms. The next actual round trip time that A sees is 60 ms. In response. A increases its estimated round trip to 50 ms. another The next actual round trip time that A sees is 40 ms. What is the next estimated round trip computed by A?
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.
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Assume that the TCP Round Trip Time (RTT) is currently 28 msec and the following ACK's come in after 29, 33, 22 ms respectively. What is the new estimate RTT (ms) using Jacoboson's algorithm (a=0.8).
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Is it the case or not? Suppose that the most recent SampleRTT on a TCP connection is 1 second. Your connection will time out if the TimeoutInterval is less than one second.