6.3-3. Polling and token-passing protocols. Which of the following statements is true about polling and token-passing protocols?Group of answer choicesThese protocol can achieve close to 100% channel utilization, in the case that all nodes always have frames to send (the fact that the utilization is close to, but not exactly, 100% is due to a small amount of medium access overhead but not due to collisions)There can be times when the channel is idle for more than a short period of time, when a node has a frame to send, but is prevented from doing so by the medium access protocol.There can be simultaneous transmissions resulting in collisions.These protocol can achieve close 100% utilization, in the case that there is only one node that always has frames to send (the fact that the utilization is close to, but not exactly, 100% is due to a small amount of medium access overhead but not due to collisions)
Question
6.3-3. Polling and token-passing protocols. Which of the following statements is true about polling and token-passing protocols?Group of answer choicesThese protocol can achieve close to 100% channel utilization, in the case that all nodes always have frames to send (the fact that the utilization is close to, but not exactly, 100% is due to a small amount of medium access overhead but not due to collisions)There can be times when the channel is idle for more than a short period of time, when a node has a frame to send, but is prevented from doing so by the medium access protocol.There can be simultaneous transmissions resulting in collisions.These protocol can achieve close 100% utilization, in the case that there is only one node that always has frames to send (the fact that the utilization is close to, but not exactly, 100% is due to a small amount of medium access overhead but not due to collisions)
Solution
The first and the last statements are true about polling and token-passing protocols. These protocols can achieve close to 100% channel utilization, whether all nodes or just one node always have frames to send. The utilization is close to, but not exactly, 100% due to a small amount of medium access overhead, not due to collisions.
The second statement is also true. There can be times when the channel is idle for more than a short period of time, when a node has a frame to send, but is prevented from doing so by the medium access protocol.
The third statement is false. In polling and token-passing protocols, there cannot be simultaneous transmissions resulting in collisions. These protocols are designed to avoid collisions by controlling when each node can send frames.
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