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CS438-HW5

Course: CS 438, Spring 2008
School: University of Illinois,...
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438: CS/ECE Communication Networks Problem Set 5 1. Slow Start Fall 2007 Due Wednesday, Dec 5 Assume a connection with RTT=50ms, MSS=1000 bytes. Ignoring overhead spent on headers, calculate the transfer time and the eective throughput for transferring a 1 MB le. Assume there are no losses and that both the connection bandwidth and the receiver window are innite (and in particular, not limited to 64K). (a)...

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438: CS/ECE Communication Networks Problem Set 5 1. Slow Start Fall 2007 Due Wednesday, Dec 5 Assume a connection with RTT=50ms, MSS=1000 bytes. Ignoring overhead spent on headers, calculate the transfer time and the eective throughput for transferring a 1 MB le. Assume there are no losses and that both the connection bandwidth and the receiver window are innite (and in particular, not limited to 64K). (a) Calculate the transfer time and eective throughput for TCP using slow start. (b) Calculate the transfer time and eective throughput supposing TCP used additive increase, starting with a window size of 1 MSS and increasing it by 1 MSS every RTT. 2. TCP Fairness Suppose there are two connections, A and B, sharing a 14 Kbit link. Let us simplify the TCP congestion control protocol to include the following assumptions: 1 MSS = 1000 bits the two connections increase their window sizes by 1 MSS per RTT, in lock-step, whenever their aggregate bandwidth is less than or equal to 14 Kbits when the aggregate bandwidth is greater than 14 Kbits, both connections simultaneously decrease their window size to 1/2 of the previous size. The window is rounded up to the next MSS size. (a) Suppose As window is currently 13000 bits and Bs window is 1000 bits, and both their RTTs are 1s. Show how the window sizes change after 20s Suppose (b) A and B both have a window of 1000 bits, A has RTT of 1s and B has RTT of 2s. Show how the window sizes change after 20s. (Assume that whenever the aggregate bandwidth exceeds 14 Kbit, the next window of each of the connection will be cut in half.) 3. Fair Queueing Consider the following packet arrivals: Flow 1 A:4, B:6, C:7, D:1, E:4 Flow 2 F:7, G:5, H:3, I:4, J:1 Flow 3 K:4, L:5, M:1, N:2, O:7, P:3 Flow 4 Q:4, R:1, S:2, T:3, U:5, V:2, W:6 Assume that at the current time, all the packets have arrived and are now sitting in the per-ow queues. The number after the colon is the size of the packet, so packet A is 5 units in size. (a) List the order of departure of these packets under the packetized weighted fair queuing scheme, with equal weights for each ow. Break ties by going...

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