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A computer on a 10­Mbps network is regulated by a token bucket. The token bucket is filled at a rate of 4 Mbps. It is initially filled to capacity with 15 Megabits. How long can the computer transmit at the full 8 Mbps (in seconds) upto two decimal places?

a.  3.75 sec

b. 3.55 sec

c. 4.20 sec

d. 3.46 sec

2 Answers

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Input Rate =4Mbps

Output Rate Required=8 Mbps

Net effect=4Mbps drain rate of the bucket

Initial capacity =15Mb

Now to drain 15Mb at rate of 4Mb/sec,we need

4Mb drained in => 1 sec

1Mb drained in =>1/4 sec

15Mb drained in=>15/4 sec =3.75 sec

So, we can have full 8Mbps for 3.75 seconds

a is correct answer
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