課程影片與練習

課程簡介
第1週:網路架構與七層參考模式簡介
第3週:IEEE 802.11 無線區域網路 (Wireless LAN)
第4週:IEEE 802.1D 交換機的擴張樹演算法 (Spanning Tree Algorithm)
第5週:IEEE 802.1Q 虛擬區域網路 (Virtual LAN)
第6週:區域網路可靠傳輸技術 -- 滑動視窗技術
第7週:路由器運作原理以及網路互連技術
第8週:TCP 與網路阻塞偵測與控制技術
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 ?
(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)

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 ?
(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

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