# Homework 3 assignment for ECE374 Posted: 03/13/15 Due: 03/27/15

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2 ECE374: Homework 1 2 Figure 1 Problem 3 (16 Points): Consider the network setup shown in Figure 2. Suppose that the ISP instead assigns the router the address and that the network address of the home network is /24. a. Assign addresses to all interfaces in the home network. b. Suppose each host has two ongoing TCP connections, all to port 80 at host Provide the six corresponding entries in the NAT translation table.

3 3 Figure 2 a) Home addresses: , , with the router interface being b) NAT Translation Table WAN Side LAN Side , , , , , , , , , , , , 3546 Problem 4 (20 Points): To calculate the timeout value the TCP sender uses to trigger a retransmission (if an acknowledgement is not received) an exponential weighted moving average is uses. For this problem you should familiarize yourself with how TCP calculates Estimated RTT. a. Capture 20 individual RTTs from your host to and store them in an Excel table. SUBMIT the resulting Excel file as additional material with your homework! b. For each of these RTTs calculate EstimatedRTT (α = 0.125) and enter these values also in the table. c. Plot the values for RTT and EstimatedRTT. d. Repeat steps b. and c. for α = 0.25 and α = 0.5.

4 ECE374: Homework 1 4 a. ping c 20 ping -c 20 awk -F " " '{split(\$7,a,"="); print a[2]}' b. One possible outcome is the one shown below. c. d. Problem 5 (20 Points):

5 5 Consider the following network. With the indicated link costs, use Djikstra s shortest- path algorithm to compute the shortest path from A to all network nodes. Show how the algorithm works by computing a table below. Figure 3 St ep N D(A),p(A) D(B),p(B) D(C),p(C) D(D),p(D) D(E),p(E) D(F),p(F) D(G),p(G) D(H),p(H) St N D(A),p(A) D(B),p(B) D(C),p(C) D(D),p(D) D(E),p(E) D(F),p(F) D(G),p(G) D(H),p(H)

6 ECE374: Homework 1 6 ep 0 0, - 1 A - A, 1 A, 4 A, 8 2 AB - A, 1 B, 3 A, 4 B, 7 B, 7 3 ABC - A, 1 B, 3 C, 4 A, 4 B, 7 C, 5 4 ABCD - A, 1 B, 3 C, 4 A, 4 B, 7 C, 5 D, 8 5 ABCDG - A, 1 B, 3 C, 4 A, 4 B, 7 C, 5 D, 8 6 ABCDGF - A, 1 B, 3 C, 4 A, 4 B, 7 C, 5 G, 6 7 ABCDGF - A, 1 B, 3 C, 4 A, 4 B, 7 C, 5 G, 6 E 8 ABCDGF - A, 1 B, 3 C, 4 A, 4 B, 7 C, 5 G, 6 H 9 - A, 1 B, 3 C, 4 A, 4 B, 7 C, 5 G, 6 Problem 6: (14 Points) For this problem consider Figure 4 and answer the following questions. In all cases provide a short discussion justifying your answer. a. For the TCP 1 transmission, identify the time intervals when TCP slow start is operating. b. For the TCP 1 transmission, identify the time intervals when TCP slow start is operating. c. For TCP 1 transmission, identify the time intervals when congestion avoidance is operating. d. For TCP 2 transmission, is the segment loss detected by triple duplicate ACK or by timeout? e. What is the initial value of ssthresh? f. What TCP flavor is shown by the TCP 1 transmission? g. What TCP flavor is shown by the TCP 1 transmission?

7 7 Figure 5 Network layout for problem 5. Figure 4 a & b c d. triple duplicate ACK e. 32 f. Tahoe g. Reno

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