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hw4key

# hw4key - source dest(a A to S 1467 23(b B to S 1513 23(c S...

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EEE459 Homework 4 answer key 5 points/review question: 1 and 3 10 points/problem: 1, 2, and 12 Review Questions 1. Going from host B to host A, source port is y and destination port is x . 3. Yes, by implementing reliable data transfer at the application layer. Problems 1. For (a) and (b), the destination port number is 23, as is the source port number for (c) and (d). This is specific to Telnet (RFC 1700). The other port numbers are anywhere in the allowable range, preferably above the 1–1024 “well-known” range. The port numbers for host A and B should match in parts a/c and b/d. One possible answer:
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Unformatted text preview: source dest. (a) A to S 1467 23 (b) B to S 1513 23 (c) S to A 23 1467 (d) S to B 23 1513 (e) Yes. A & B might choose the same number. (f) No. The host would keep track and not choose the same number twice. 2. host source port source IP dest port dest IP A 80 b 26145 a C 1 80 b 7532 c C 2 80 b 26145 c 12. round trip time RTT = 30 ms , transmit rate R = 1 Gbps , packet length L = 8 kb , utilization u = 0 . 9, and window size N , u = t busy t total = N · ( L/R ) RTT + ( L/R ) N = u ( RTT + ( L/R )) ( L/R ) = . 9 · 30 . 008 ms . 008 ms ≈ 3376 packets 1...
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