A Computer on a 10Mbps network is regulated by a token bucket. The token…

20222008

A Computer on a 10Mbps network is regulated by a token bucket. The token bucket is filled at a rate of 2Mbps. It is initially filled to capacity with 16 megabits. What is the maximum duration for which the computer can transmit at the full 10Mbps?

Answer: B. 2 seconds — Answer: 2 seconds. Explanation: Initial tokens available: 16 megabits. Token fill (refill) rate: 2 Mbps. Transmission rate when sending at full speed: 10…

  1. A.

    1.6 seconds

  2. B.

    2 seconds

  3. C.

    5 seconds

  4. D.

    8 seconds

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Correct answer: B

Answer: 2 seconds.

Explanation:

  1. Initial tokens available: 16 megabits.

  2. Token fill (refill) rate: 2 Mbps. Transmission rate when sending at full speed: 10 Mbps.

  3. Net token consumption while sending at full speed = transmit rate - fill rate = 10 Mbps - 2 Mbps = 8 Mbps.

  4. Maximum duration = initial tokens / net consumption = 16 megabits / 8 Mbps = 2 seconds.

Quick check: If you ignored the refill you would get 16 / 10 = 1.6 s. Including the refill extends the time to 2 s, which matches the correct result.

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