Consider the TCP procedure for estimating RTT. Suppose that α=0.1. Let Sample RTT1, be the most recent sample RTT, let Sample RTT2 be the next most recent sample RTT, and so on. a. For a given TCP connection, suppose four unacknowledged have been returned with corresponding sample RTTs, SampleRTT4, Sample RTT3, SampleRTT2, and SampleRTT1. Express EstimatedRTT1 in terms of the four sample RTTs. b. Generalize your formula for n sample round-trip ti

Consider the TCP procedure for estimating RTT. Suppose that α=0.1. Let Sample RTT1, be the most recent sample RTT, let Sample RTT2 be the next most recent sample RTT, and so on. a. For a given TCP connection, suppose four unacknowledged have been returned with corresponding sample RTTs, SampleRTT4, Sample RTT3, SampleRTT2, and SampleRTT1. Express EstimatedRTT1 in terms of the four sample RTTs. b. Generalize your formula for n sample round-trip ti

Principles of Information Security (MindTap Course List)

6th Edition

ISBN:9781337102063

Author:Michael E. Whitman, Herbert J. Mattord

Publisher:Michael E. Whitman, Herbert J. Mattord

Chapter6: Security Technology: Access Controls, Firewalls, And Vpns

Section: Chapter Questions

Problem 2RQ

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onsider the TCP procedure for estimating RTT. Suppose that . Let SampleRTT be the most recent sample RTT, let SampleRTT be the next most recent sample RTT, and so on.a. For a given TCP connection, suppose four acknowledgments have been returned with corresponding sample RTTs: SampleRTT , SampleRTT , SampleRTT , and SampleRTT . Express EstimatedRTT in terms of the four sample RTTs.b. Generalize your formula for n sample RTTs.c. For the formula in part (b) let n approach infinity. Comment on why this averaging procedure is called an exponential moving average.
The situation may be seen from two perspectives. Consider a TCP connection where the most recent SampleRTT was 1 second. For the present connection, TimeoutInterval must be higher than or equal to one second.
In TCP Fast Retransmit, if we receive three duplicate ACKS after sending out a packet that is not incrementally ACK-ed but before the time-out associated with that packet, we immediately retransmit the packet without waiting for the timeout to occur. Why do we wait for three duplicates instead of just one?
Is this the right answer or the wrong answer? Assume that the most recent SampleRTT for a TCP connection is one second. The TimeoutInterval setting for the connection must now be set to a value that is greater than one second.
Is it the case or not? Consider a TCP connection where the most recent SampleRTT was 1 second. The current TimeoutInterval setting for the connection must be larger than one second.
Consider a TCP connection with congestion window size 40 KB, maximum segment size is 2 KB, if time taken by TCP connection to get 37 KB congestion window is 351 ms, round trip time of the connection is __(ms).
This a TCP question with 5 parts, using the context given in questions 11 and 12 only answer and show work for other three parts (13-15)
There are two perspectives to consider. It is assumed that the most recent SampleRTT on a TCP connection is 1 second. To keep the current connection open, TimeoutInterval has to be larger than or equal to one second.
Is it the case or not? Consider a TCP connection where the most recent SampleRTT was 1 second. Current TimeoutInterval value for the connection must be larger than one second.
Suppose two TCP connections are present over some bottleneck link of rate R bps. Both connections have a huge file to send (in the same direction over the bottleneck link). The transmissions of the files start at the same time. What transmission rate would TCP like to give to each of the connections?
Does this hold true or does it not? Let's say that the SampleRTT from the most recent TCP connection was one second. The current TimeoutInterval number for the link must be greater than one second.
Assume that a bottleneck connection with a rate of R bps carries two TCP connections. In both cases, there is a big file that must be downloaded (in the same direction over the bottleneck link). The files are all transmitted at the same time How much data will TCP be able to transmit each connection?