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2週：IEEE 802.3 乙太網路 (Ethernet)
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
※觀看影片請點擊影片名稱後方的"YOUTUBE"或"YOUKU"，
觀看YOUKU影片，請輸入密碼：mooc01004
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
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6.1 Which of the following mechanisms are usually used to provide reliable transmission ? 下列哪些技術常被用來實作可靠傳輸 ? |
| (a) Acknowledgements肯定回覆 | |
| (b) Beacon 信標 | |
| (c) Timeouts 等待逾時 | |
| (d) Polling輪詢 | |
| (e) Fragmentation 片段儲存 |
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6.2 Which of the following statements are correct about the “Acknowledgement” in the reliable transmission ? |
| (a) The receipt of an acknowledgement indicates to the sender that its frame was not successfully delivered 收到肯定回覆表示傳送端的訊框沒有正確傳送 | |
| (b) The receipt of an acknowledgement indicates to the sender that its frame was successfully delivered 收到肯定回覆表示傳送端的訊框已成功傳送 | |
| (c) When the sender receives an acknowledgement of its frame, it will transmit the frame again to make sure the frame is delivered successfully. 當傳送端收到訊框的肯定回覆,他會再傳送一次訊框以確保訊框成功傳送. | |
| (d) If a sender does not receive an acknowledgment after a reasonable amount of time, then the sender retransmits the original frame 若傳送端在一個適當時間內沒有收到肯定回覆,傳送端會重新傳送原本的訊框 | |
| (e) The receiver sends an acknowledgement back to the sender when a frame is received correctly 接收端正確的收到一個訊框後會送出肯定回覆給傳送端 |
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6.3 The general strategy of using acknowledgements and timeouts to implement reliable delivery is sometimes called ? |
| (a) Address Resolution Protocol (ARP). | |
| (b) Automatic Repeat reQuest (ARQ) | |
| (c) Automatic Acknowledgement Repeat Protocol | |
| (d) Sliding Window Protocol | |
| (e) Native Acknowledgement Protocol (NAK) |
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