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1 Feedback Homework 7 Help You submitted this homework on Sun 9 Mar :00 AM PST. You got a score of 4.00 out of Question 1 Let a TCP sender send packets with 1500 bytes of data payload per packet, and let the receiver use the cumulative ACK scheme to acknowledge received packets. Consider the following scenario where the sender has sent packets with the following sequence numbers: 4000, 5500, 7000, and Assume that all packets are received in order. If the receiver were to send an ACK packet after receiving the last data packet, what is the acknowledgement number sent with this packet? TCP ACK contains the next sequence number that the receiver expects. The packet with sequence number 8500 contains data ranging from sequence number 8500 to 9999 (since the packet size is 1500 and the packet s sequence number is the sequence number of the first byte on the packet). The next sequence number that the receiver expects is Question 2 1/5
2 Let a TCP sender send packets with 1500 bytes of data payload per packet, and let the receiver use the cumulative ACK scheme to acknowledge received packets. (Note that the standard cumulative ACK scheme does not use selective ACKs or SACKs.) Consider the following scenario where the sender has sent packets with the following sequence numbers: 3000, 4500, 6000, and Assume that the packet with sequence number 6000 is lost, but the other packets are delivered in order. If the receiver were to send an ACK packet after receiving the last data packet, what is the acknowledgement number sent with this packet? TCP ACK contains the next expected byte which would typically be the packet that is lost Question Read about cumulative ACKs. Question 3 Consider the network topology shown in the figure with four flows (A, B, C, and D), which flow from left to right (i.e., A flows from R1 on the left to R3 on the right, B flows from R1 on the left to R3 on the right, C flows from R4 on the left to R3 on the right, etc.). Assume that all links have unit capacity. If the flows are allocated based on max-min fair allocation, what is the bandwidth allocated to flow D? 2/5
3 / Total 0.00 / Question Review the example in slide 12 of lecture 7.2. Question 4 Consider the effect of using slow start on a network path with a 10 millisecs round trip time and no congestion (i.e., assume there is no packet loss). Assume that the flow is able to inject backto-back packets with very little delay and that the bottleneck link introduces minimal separation between packets as it transmits them. If the flow starts out by sending one packet at time t=0, how many packets are sent between time t=30 ms and t=40 ms? 16 8 The flow doubles its window every RTT. For example, after the first 3/5
4 ACK comes back, the flow transmits 2 packets at about t=rtt. Continue with this logic and you will get the final answer. 3 2 Question Read about slow-start. (Ignore real-life TCP complexities that can interact with congestion control such as delayed ACKs) Question 5 Consider a TCP flow over a 10 millisecs round trip time path. Assume that it is in the Additive Increase phase of transmission and also assume that it transmitted 10 packets between time t=100ms and t=110ms. What is the expected number of packets the flow would transmit between t=120ms and t=130ms assuming that there was no packet loss during this Additive Increase phase? 12 In the additive increase phase, window size increases by 1 every RTT Question Read about additive increase. 4/5
5 5/5
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