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DCN assignment 1 questions

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  1. Chapter 1:
  2. Review Questions: Q. 5 , 7 and 14
  3. Problems: Q. 3 and  4
  4.  
  5. Chapter 2:
  6.  Review Questions: Q. 6, 9, 11, 13, 14, 16 and 19
  7.  
  8. Q. Suppose if you have created a new company called "YourName Branch". How do people get IP address of your company Web site?
  9.  
  10.  
  11. Chap1 - Review Questions:
  12. 5) Suppose that between a sending host and a receiving host there is exactly one packet switch. The
  13. transmission rates between the sending host and the switch and between the switch and the receiving
  14. host are R1 and R2, respectively. Assuming that the router uses store-and-forward packet switching, whais the total end-to-end delay to send a packet of length L. (Ignore queuing and propagation delay.)
  15.  
  16. 7) What is meant by connection state information in a virtual-circuit network?
  17.  
  18.  
  19. 14) Review the car-caravan analogy in Section 1.6. Again assume a propagation speed of 100km/hour.
  20. a) Suppose the caravan travels 200 km, beginning in front of one toll booth, passing through a
  21. second toll booth, and finishing just before a third toll booth. What is the end-to-end delay?
  22. b) Repeat (a), now assuming that there are 7 cars in the caravan instead of 10.
  23.  
  24. Chap1 - Problems:
  25. 3)
  26. Consider sending a file of F = M *L bits over a path of Q links. Each link transmits at R bps. The
  27. network is lightly loaded so that there are no queueing delays. When a form of packet switching is used,
  28. the M * L bits are broken up into M packets, each packet with L bits. Propagation delay is negligible.
  29. a) Suppose the network is a packet-switched virtual-circuit network. Denote the VC set-up time
  30. by ts seconds. Suppose to each packet the sending layers add a total of hbits of header. How long
  31. does it take to send the file from source to destination?
  32. b) Suppose the network is a packet-switched datagram network, and a connectionless service is
  33. used. Now suppose each packet has 2h bits of header. How long does it take to send the file?
  34. c) Repeat (b), but assume message switching is used (i.e., 2hbits are added to the message, and
  35. the message is not segmented).
  36. d) Finally, suppose that the network is a circuit switched network. Further suppose that the
  37. transmission rate of the circuit between source and destination is Rbps. Assuming tsset-up time
  38. and hbits of header appended to the entire file, how long does it take to send the file?
  39.  
  40.  
  41. 4)
  42. Experiment with the message-switching Java applet in this chapter. Do the delays in the applet
  43. correspond to the delays in the previous question? How do link propagation delays effect the the overall
  44. end-to-end delay for packet switching and for message switching?
  45.  
  46.  
  47. Chap2 - Review Quesions:
  48. 6) What is meant by a handshaking protocol?
  49. 9) What is the difference between persistent HTTP with pipelining and persistent HTTP without
  50. pipelining? Which of the two is used by HTTP/1.1?
  51. 11) Why is it said that FTP sends control information "out of band"?
  52.  
  53. 13) Suppose that you send an e-mail message whose only data is a Microsoft Excel attachment. What
  54. might the header lines (including MIME lines) look like?
  55. 14) Print out the header of a message that you have recently received. How many Recieved: header
  56. lines are there? Analyze each of the header lines in the message.
  57. 16) Redraw Figure 2.5-4 for when all queries from the local nameserver are iterative.
  58. 19) Use nslookup to find a Web server that has multiple IP addresses. Does the Web server of your
  59. institution (school, company, etc.) have multiple IP addresses?
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