pra30Jan06

pra30Jan06 - network during the middle of the file transfer...

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Consider sending a data file of F = 2 Mbit with packet switching from A to B through one intermediate router. Suppose the packet size is P = 1 kbit, ignore packet headers. The link from A to the router is d_1 = 25 km long and has a transmission rate of R_1 = 10 Mbit/sec. The link from the router to is d_2 = 2500 km long and has a transmission rate of R_2 = 1 Mbit/sec. Ignore processing delays. Also, ignore cross traffic, i.e., the packets are not competing with other packet flows at the router. The propagation speed is s = 2.5 x 10^8 m/sec. a) What is the delay d in getting the file to B? What is the “steady-state” throughput of the considered network, i.e., how many bit/sec are transmitted through the
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Unformatted text preview: network during the middle of the file transfer operation? How many packets per second? b) b) Now suppose we employ the following transmission protocol: A can only send the next packet when an acknowledgement for the preceding packet has arrived. Acknowledgements are very small packets with negligible transmission delay, but they encounter the propagation delay. What is the delay d in getting the file to B? What is the throughput of the considered network, i.e., how many bit/sec are transmitted through the network? How many packets per second?...
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