Aptitude - File transfer Question

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File transfer Question

A file is transferred from one location to another in ,buckets,. The size of the bucket is 10 kilobytes. The bucket gets filled at the rate of 0.0001 kilobytes per millisecond. The transmission time from sender to receiver is 10 milliseconds per bucket. After the receipt of the bucket the receiver sends an acknowledgement that reaches sender in 100 milliseconds. Assuming no error during transmission, write a formula to calculate the time taken in seconds to successfully complete the transfer of a file of size N kilobytes.

Total Answers and Comments: 6

Last Update: December 14, 2008 Asked by: abhijit_de2000

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Best Rated Answer

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Submitted by: amitsha

rate=1 ms -> .0001kb
or 1 kb -> 10000ms
N kb -> N*10000ms
10ms(to reciver)+N*10000ms(to fill)+100ms(for recipent)=(110+N*10000)ms

Above answer was rated as good by the following members:
hydsarema

July 18, 2008 02:33:26

wasim.madiwale

Member Since: July 2008 Contribution: 1

RE: File transfer Question

T N * 1000.011 seconds

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July 25, 2008 08:55:26

ajaycjoseph

Member Since: July 2008 Contribution: 1

RE: File transfer Question

100.11*n

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August 07, 2008 11:05:07

amitsha

Member Since: August 2008 Contribution: 1

RE: File transfer Question

rate 1 ms -> .0001kb
or 1 kb -> 10000ms
N kb -> N*10000ms
10ms(to reciver)+N*10000ms(to fill)+100ms(for recipent) (110+N*10000)ms

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1 0

Overall Rating: +1

August 17, 2008 08:04:03

arsi_mars

Member Since: August 2008 Contribution: 1

RE: File transfer Question

(i) total time to fill Nkb 10000N
10 kb >1bkt
N kb > N/10 bucket
(ii)To send 10 ms per bucket so for N/10 bucket it is N ms
(iii) Now acknowledge for 1 bkt 100ms
Acknowledge for N/10 bkt (N/10)*100 10N
Total time- 10000N+N+10N 10011N answer

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November 08, 2008 08:57:22

Raze2dust

Member Since: November 2008 Contribution: 3

RE: File transfer Question

Bucket is filled at 0.1 kbps. So each bucket takes 100 s. There are N/10 buckets.
Each bucket takes 0.01 s to transmit and 0.1 s more to get the acknowledgement.

Let there be k full buckets...Time taken to fill them 100k
Remaining N 10 kbs will take [(N 10)/10]*100 s (N 10)*10 s

Transmission+acknowledment needs further 0.01+0.1 s

So total time 10N+(N 10)*10+0.11 10[N+N 10+0.011]

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December 13, 2008 11:57:20

prasadude

Member Since: December 2008 Contribution: 1

RE: File transfer Question

the speed at which a bucket filled is is 0.0001 kilobytes per millisecond
this is re-written as 0.1 kilobytes per second
i.e 100 seconds to fill a bucket which is 10kb in size
transmission time is 10 milliseconds or .01 sec
reception time is 100 milliseconds or .1 sec
the total time is 100+.01+.1 100.11 sec

the size of a file is N kb
it must thus contain N/10 buckets
thus the total time required is N/10 * (100.11) N*10.011 seconds

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