GATE CS 2016 Set 1 — Question 64
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Computer Networks → Network Layer: Routing → TCP Congestion Control
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Question
For a host machine that uses the token bucket algorithm for congestion control, the token bucket has a capacity of 1 megabyte and the maximum output rate is 20 megabytes per second. Tokens arrive at a rate to sustain output at a rate of 10 megabytes per second. The token bucket is currently full and the machine needs to send 12 megabytes of data. The minimum time required to transmit the data is ________ seconds.
Correct answer
1.1 to 1.1
Solution
Given:
During the burst, the bucket is emptied at rate while being filled at rate . The time it takes to empty a full bucket is given by:
seconds
After the bucket is empty, data can only be sent at the token arrival rate MB/s.
Time for remaining data = second
- Bucket Capacity () = 1 MB
- Maximum Output Rate () = 20 MB/s
- Token Arrival Rate () = 10 MB/s
- Total Data to send () = 12 MB
During the burst, the bucket is emptied at rate while being filled at rate . The time it takes to empty a full bucket is given by:
seconds
2.Calculate data sent during the burst:
Data sent = MB3.Calculate remaining data and time:
Remaining data = MBAfter the bucket is empty, data can only be sent at the token arrival rate MB/s.
Time for remaining data = second
4.Calculate total time:
Total time = Burst time + Remaining time = seconds.Continue learning with Success Tracker
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