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Chapter 1 Examples and Homework Problems CSE3214 Computer Network Protocols and Applications
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Example 1 (review question 18) (1) How long does it take a packet of length 1000 bytes to propagate over a link of distance 2500km, propagation speed 2.5x10 8 m/s, and transmission rate 2 Mbps? (2) More generally, how long does it take a packet of length L to propagate over a link of distance d , propagation speed s , and transmission rate R bps? (3) Dose this delay depend on packet length? (4) Does this delay depend on transmission rate?
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Solution to Example 1 (1) How long does it take a packet of length 1000 bytes to propagate over a link of distance 2500km, propagation speed 2.5x10 8 m/s, and transmission rate 2 Mbps? Ans: (2500*10^3)/(2.5*10^8)=0.01s = 10ms (2) More generally, how long does it take a packet of length L to propagate over a link of distance d , propagation speed s , and transmission rate R bps? Ans: d/s (3) Dose this delay depend on packet length? No (4) Does this delay depend on transmission rate? No
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Example 2 (R19) Suppose Host A wants to send a large file to Host B. The path from Host A to Host B has three links, of rate R 1=500kbps, R 2=2Mbps, and R 3=1Mbps. a. Assuming no other traffic in the network, what is the throughput for the file transfer? b. Suppose the file is 4 million bytes. Dividing the file size by the throughput, roughly how long will it take to transfer the file to Host B? c. Repeat (a) and (b), but now with R 2 reduce to 100kpbs.
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Solution to Example 2 Suppose Host A wants to send a large file to Host B. The path from Host A to Host B has three links, of rate R 1=500kbps, R 2=2Mbps, and R 3=1Mbps. a. Assuming no other traffic in the network, what is the throughput for the file transfer? Ans: 500kpbs. a. Suppose the file is 4 million bytes. Dividing the file size by the throughput, roughly how long will it take to transfer the file to Host B?
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