Explain why a TCP segment timeout that is too short contributes to overall network congestion. What is the drawback of using a timeout value that is too long ? Explain in detail with steps and digrams with a long description and elaboration.
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Explain why a TCP segment timeout that is too short contributes to overall network congestion. What is the drawback of using a timeout value that is too long ? Explain in detail with steps and digrams with a long description and elaboration.
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- 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).Below are the two questions, so make sure to answer each part carefully and label the response for each question: 1) Why does TCP implement congestion control if it already has flow control to manage the sender's window? 2) Consider our recent reading [Chiu+89] Analysis of the Increase and Decrease algorithms for congestion avoidance in computer networks. How does this article showcases that TCP is fair?A TCP connection is using a window size of 8,000 bytes and the previousacknowledgment number was 10,001. It receives a segment with acknowledgment number 12,001 and window size advertisement of 7,000 bytes. Draw a diagram to show the situation of the window before and after.
- Suppose TCP operates over a 1-Gbps link. (a) Assuming TCP could utilize the full bandwidth continuously, how long would it take the sequence numbers to wrap around completely? (b) Suppose an added 32-bit timestamp field increments 1000 times during the wraparound time you found above. How long would it take for the timestamp to wrap around?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.A TCP message of 19.2KBytes is sent in a network system with a 1000Byte MTU. Source and destination are 7 hops apart. The distance between hops is 250 km. Each router has a processing delay of 1000nSec (nano seconds). The throughput in the network is 10Gbps except for the device in the last hop which only has a throughput of 5Gbs. Find the end-to-end latency in the system considering this is a Packet Switched network. Consider each packet has 40Bytes of header overhead. The speed and light for this problem will be 200,000 km/s.
- 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.TCP congestion control example. Consider the figure below, where a TCP sender sends 8 TCP segments at t = 1, 2, 3, 4, 5, 6, 7, 8. Suppose the initial value of the sequence number is 0 and every segment sent to the receiver each contains 100 bytes. The delay between the sender and receiver is 5 time units, and so the first segment arrives at the receiver at t = 6. The ACKs sent by the receiver at t = 6, 7, 8, 10, 11, 12 are shown. The TCP segments (if any) sent by the sender at t = 11, 13, 15, 16, 17, 18 are not shown. The segment sent at t=4 is lost, as is the ACK segment sent at t=7. TCP sender t=1 T t=2 t=3 t=4+ t=5- t=6+ t=11 t=12 t=13 t=14 t=15 t=16 t=17 t=18 I data segment data segment data segment data segment data segment data segment data segment data segment ACK ACK ACK ACK ACK ACK Ty A A V V htt TCP receiver t=6 t=7 t=8 t=9 t=10 t=11 t=12 t=13 What does the sender do at t=17? You can assume for this question that no timeouts have occurred.TCP congestion control example. Consider the figure below, where a TCP sender sends 8 TCP segments at t = 1, 2, 3, 4, 5, 6, 7, 8. Suppose the initial value of the sequence number is 0 and every segment sent to the receiver each contains 100 bytes. The delay between the sender and receiver is 5 time units, and so the first segment arrives at the receiver at t = 6. The ACKS sent by the receiver at t = 6, 7, 8, 10, 11, 12 are shown. The TCP segments (if any) sent by the sender att = 11, 13, 15, 16, 17, 18 are not shown. The segment sent at t=4 is lost, as is the ACK segment sent at t=7. t=1 T data segment t=2+ data segment data segment-- t=3 TCP sender TCP receiver t=4+ t=5+ data segment - data segment t=6+ t36 data segment t=7 data segment t=8 data segment t=9 ACK + t=10 k -- ACK t=11 t=11 t=12 t=12 t=13 t=13 t=14 ACK -ACK ACK t=15 t=16 t=17 ACK t=18 What does the sender do at t=17? You can assume for this question that no timeouts have occurred.
- 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.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?Consider a TCP connection with the following parameters: a) Initial ssthreshold = 8b) Round Trip Time (RTT) = 10 millisecondsc) Timeout Interval = 40 milliseconds d) Segment size = 2800 bytes The TCP connection was used to transfer 16 segments. While sending the segments, Segment 5 and Segment 15 were lost the first time they were sent (but arrived at the receiver properly when retransmitted). There were no other segment losses apart from the aforementioned. Assume that segments received out-of-order are buffered at the receiver. What is the average throughput obtained in sending all the segments (in bytes/sec)? Draw a diagram to show your work in detail.