Question

1. Suppose Host A wants to send a large file to Host B. The path from Host A to Host B has three links, of rates R1 = 500 Kbps, R2 = 2 Mbps, and R3=1 Mbps.

     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 R2 reduced to 100 kbps.

Answer 1

Answer-

Given that-

• R1 = 500 Kbps, R2 = 2 Mbps, and R3=1 Mbps

Answer A-

• basically, the throughput for the file transfer- you need to choose minimum(R1,R2,R3)
• the Answer is — 500Kbps

Answer B-

• given file size- 4 million bytes
• So firstly change over million bytes to bits =32000000 bits.
• And file transfer=500 Kbps=500000 bps
• transfer the file to Host B =file size/throughput for the file transfer
• transfer the file to Host B =32000000 bits/500000 bps
• The correct Answer is=64 seconds

Answer C-

Now following question given value- R1=500 Kbps R2= 100 Kbps R3=1 Mbps.

Repeat a)-

• Basically, the throughput for the file transfer- you need to choose minimum(R1,R2,R3)
• the Answer is — 100 Kbps

Repeat B)-

time for transfer the file to Host B

• file size/throughput for the file transfer=32000000 bits/100000bps = 320 seconds
• the correct Answer is = 320 seconds

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