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
第7週：路由器運作原理以及網路互連技術
※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8週：TCP 與網路阻塞偵測與控制技術
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7.18 Which of the following statements are correct for "Address Resolution Protocol (ARP)" ?
下列哪些對於“位址解析協議 (ARP)”的敘述是正確的 ?
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| (a) It is used to map IP addresses into physical (MAC) addresses 它被用來依據IP位址尋找其對應的實體MAC位址 | |
| (b) Each host has an IP/MAC mapping table to binding the IP address to physical (MAC) address 每個主機有一個IP/MAC對照表以綁定IP位址與MAC位址 | |
| (c) For a host, if an IP address is not in its IP/MAC table, it sends an ARP request to the IP address directly by using unicast packet. 如果有某個IP不存在於IP/MAC表，該主機會透過單點傳送(unicast)發送ARP請求給此IP主機 | |
| (d) When the targeted host receives an ARP request, it will respond with its physical MAC address. 當目的地主機收到ARP請求，它會回覆自己的實體MAC位址 | |
| (e) Every host receives an ARP request will respond with its physical address. 任何主機收到ARP請求皆會回覆自己的實體MAC位址 |
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7.19 Which of the following statements are correct for "Dynamic Host Configuration Protocol (DHCP)" ?
下列哪些對於“動態主機設定協議 (DHCP)”的敘述是正確的 ?
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| (a) For an administrative domain, there is at least one DHCP server 每一個管理網域裡至少有一台DHCP伺服器 | |
| (b) The DHCP server is responsible for providing configuration information to hosts DHCP伺服器負責提供設置資訊給主機 | |
| (c) The DHCP server maintains a pool of available addresses DHCP伺服器維護並管理一組可用的位址 | |
| (d) Newly booted host sends DHCP DISCOVER message to an IP address = 255.255.255.254 新啟動的主機發送 DHCP DISCOVER 訊息到一個 IP = 255.255.255.254 的位址 | |
| (e) Newly booted host sends DHCP DISCOVER message to an IP address = 255.255.255.255 新啟動的主機發送 DHCP DISCOVER 訊息到一個 IP =255.255.255.255的位址 |
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7.20 The Internet Message Control Protocol (ICMP) defines a collection of error messages that are sent back to the source host whenever a router or host is unable to process an IP datagram successfully. Which of the following errors will be reported by the ICMP protocol ?
互聯網控制訊息協議 (ICMP)定義一組錯誤訊息，當路由器或主機無法成功處裡一個 IP 封包時，會將錯誤訊息送回給來源主機。ICMP 協議會回報下列哪些錯誤 ?
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| (a) Destination host unreachable 封包無法到達目的地主機 | |
| (b) Reassembly process failed 封包重組失敗 | |
| (c) TTL had reached 0 封包的標頭TTL值變為0 | |
| (d) IP header checksum failed IP標頭檢查碼檢查出錯誤 | |
| (e) Dropped by router due to network congestion 因網路阻塞造成路由器丟棄封包 |
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