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Recent questions tagged congestion-control

2 votes
1 answer
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Closed - Loop control mechanism try to : Remove congestion after it occurs Remove congestion after sometime Prevent congestion before it occurs Prevent congestion before sending packets
asked Mar 31, 2020 in Computer Networks Lakshman Patel RJIT 379 views
2 votes
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1 vote
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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?
asked Apr 18, 2019 in Computer Networks ajaysoni1924 501 views
2 votes
1 answer
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Suppose that the TCP congestion window is set to 18 KB and a timeout occurs. How big will the window be if the next four transmission bursts are all successful? Assume that the maximum segment size is 1 KB.
asked Mar 18, 2019 in Computer Networks ajaysoni1924 276 views
1 vote
2 answers
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Consider the effect of using slow start on a line with a 10-msec round-trip time and no congestion. The receive window is 24 KB and the maximum segment size is 2 KB. How long does it take before the first full window can be sent?
asked Mar 18, 2019 in Computer Networks ajaysoni1924 237 views
0 votes
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Some other policies for fairness in congestion control are Additive Increase Additive Decrease (AIAD), Multiplicative Increase Additive Decrease (MIAD), and Multiplicative Increase Multiplicative Decrease (MIMD). Discuss these three policies in terms of convergence and stability.
asked Mar 18, 2019 in Computer Networks ajaysoni1924 338 views
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which value do we have to return when the question is like this ..what is the window size at the end of nth transmission? do we have to return window size at nth transmission or window size of (n+1)th transmission ...there always comes a single value gap which ... to be true in test series and sometimes false? pls clarify this ..don't want to loose marks if this comes in actual gate exam.
asked Jan 31, 2019 in Computer Networks Ashwani Yadav 130 views
2 votes
2 answers
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5 votes
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Consider a TCP connection using the multiplicative additive congestion control algorithm where the window size is 1 MSS and the threshold is 32 MSS. At the $8^{th}$ transmission timeout occurs and enters in the congestion detection phase. The value of the window size (in MSS) at the ... end of $12^{th}$ transmission. So we have to take the window size after the 12 RTTs right and not at 12th RTT?
asked Jan 15, 2019 in Computer Networks MiNiPanda 735 views
0 votes
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Consider an instance of TCP additive increase multiplicative decrease (AIMD) algorithm where the window size at the start of the slow start phase is 2 MSS and the threshold at the start of the first transmission is 12 MSS. Assume that a time out occurs during the ... ______. (in MSS) My question is, After reached to threshold, should we have to increase congestion window with 1MSS or with 2MSS.
asked Jan 14, 2019 in Computer Networks JAYKISHAN 318 views
2 votes
1 answer
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Consider an instance of TCP's Additive Increase Multiplicative Decrease (AIMD) algorithm where the window size at the start of slow start phase is 2 MSS and the threshold at the start of 1 st transmission is 16 MSS. Assume TCP use over a lossy link i.e., timeout occur ... given window at the start of slow start phase is 2 MSS ;so when timeout occur should'nt we start with window size of 2 MSS]
asked Jan 7, 2019 in Computer Networks newdreamz a1-z0 148 views
2 votes
2 answers
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Consider the following plot of TCP window size as a function of time. Assume TCP is operating with slow start, congestion avoidance, fast retransmit and fast recovery mechanism. What is the time interval where the slow start runs again because of a time-out ... cwnd to the value of threshold. It starts congestion avoidance phase again. Please explain in more details about the concept underlying?
asked Jan 6, 2019 in Computer Networks Sandy Sharma 735 views
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Assume the scenario where size of the congestion window of a TCP connection be 40KB when timeout occurs. The MSS is 2KB. Propagation delay be 200msec. Time taken by TCP connection to get back to 40KB congestion window is …...
asked Dec 2, 2018 in Computer Networks Na462 454 views
1 vote
1 answer
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Consider an instance of TCP’s Additive Increase Multiplicative Decrease (AIMD) algorithm where the window size at the start of slow start phase is 1 MSS and the threshold at the start is 1st transmission is 16 MSS. Assume TCP use over a lossy link i.e., timeout occur after transmission of 7th packet . What is the congestion window size at the end of 14 RTT (in MSS)?
asked Dec 1, 2018 in Computer Networks Sandy Sharma 472 views
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Suppose you are using TCP to transfer a 4 MB file over a network. The receiver advertises a receive window of 4 MB. Assume that the retransmission timers expire after 5 RTTs. (a) If TCP sends 4KB segments, how many RTTs does it take to send the ... using implements fast retransmit and fast recovery. How many RTTs are saved by the fact that your TCP implements fast retransmit and fast recovery?
asked Nov 26, 2018 in Computer Networks akmishra_1947 338 views
0 votes
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Consider an instance of TCP’s Additive Increase Multiplicative Decrease (AIMD) algorithm where the window size at the start of slow start phase is 2 MSS and the threshold at the start is 1st transmission is 12 MSS. Assume timeout occur after transmission of 7th transmission . The congestion window size at the end of 12th transmission is _________ (in MSS).
asked Nov 26, 2018 in Computer Networks jatin khachane 1 215 views
1 vote
1 answer
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Consider the effect of using slow start on a line with 10 msec round trip time. The receiver window and the size of congestion window are set to 38 KB and 36 KB respectively. Sender side threshold is set to 18 KB. After 8 transmission a timeout occurs, after time out, the time taken to send first full window of 18 KB is ________ (in msec).
asked Oct 16, 2018 in Computer Networks Shivangi Parashar 2 988 views
0 votes
1 answer
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Consider "Additive -increase multiplicative -decrease "approach of TCP congestion control.one MSS(Maximum Segment Size)is 512B .If the TCP sender doesn't perceive the path as not congested then. What will be the congestion window size after 4RTTS provided the congestion window is assigned 1MSS initially ?
asked Oct 12, 2018 in Others Shivangi Parashar 2 591 views
0 votes
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