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2.19. Which of the following MAC protocol is used by Ethernet ?下列何者為乙太網路使用的MAC協議 ?
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| (a)CSMA (Carrier Sense Multiple Access) | |
| (b)Random Multiple Access Protocol | |
| (c)CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) | |
| (d)CSMA/CD (Carrier Sense Multiple Access with Collision Detection) | |
| (e)CSMA/CE (Carrier Sense Multiple Access with Collision Enforcement) |
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2.20. Which of the following are correct for CSMA (Carrier Sense Multiple Access) protocol ?下列哪些對於CSMA (Carrier Sense Multiple Access) 協議的敘述是正確的 ?
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| (a)Listen (carrier sense) before transmit. 傳輸前先聽 | |
| (b)Transmit a frame any time when a station has frame. 當工作站有訊框時就立即傳送 | |
| (c)If channel is sensed idle, then transmit entire frame without considering if frame collision is detected. 當偵測到頻道為空閒時,就傳送整包訊框,無論是否偵測到訊框碰撞 | |
| (d)If channel is sensed busy, then defer transmission. 假如偵測到頻道為忙碌時,就延遲傳輸 | |
| (e)No collision will happen as the frames are transmitted only when the channel is sensed “idle”. 因為只有當偵測到頻道為空閒時,訊框才會被傳送出去,因此不會發生碰撞的情形 |