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
2.15. Which of the following are correct for an Ethernet frame ?下列哪些對乙太網路訊框的敘述是正確的?
(a)The “preamble” is a sequence of “00000000…00” for better synchronizations between the sender and receiver. “preamable”是一個“00000000…00”的序列,為了讓傳送端及接收端之間可以達到同步
(b)The “preamble” is a sequence of “101010…10” for better synchronizations between the sender and receiver. “preamable”是一個“101010…10”的序列,為了讓傳送端及接收端之間可以達到同步。
(c)Both destination MAC address and source MAC address have a length of 8 bytes. 目的地MAC地址和來源MAC地址長度皆為8 位元組
(d)The “padding field” is used when the data part (LLC-frame) of the frame is less than 64 bytes. 當訊框的資料部分長度少於64位元組時,會使用到padding 欄位
(e)The “Frame Check Sequence (FCS)” is used to check if the frame is received correctly, and the used algorithm is CRC-16. “Frame Check Sequence (FCS)”是用來檢查接受到的訊框是否正確,其使用的演算法為CRC-16.

2.16.(a)The minimum length of an Ethernet frame is ______ bytes ? 
(b) the maximum length of an Ethernet frame is ___________ bytes ?
(a) 乙太網路訊框的最短長度為___位元組 ? 
(b) 乙太網路訊框的最大長度為___位元組 ?

2.17. The Ethernet MAC address is presented as a sequence of six numbers separated by colons. Each number corresponds to 1 byte of the 6-byte address and is given by a pair of hexadecimal digits, one for each of the 4-bit nibbles in the byte. What is the MAC address for 00001000 00000000 00101011 11100100 10110001 00000010 ?
 
乙太網路之MAC地址以六個用冒號隔開的數字來呈現,每一個數字對應到1 位元組,且可用十六進位來表示,請問下列MAC 地址00001000 00000000 00101011 11100100 10110001 00000010,如何用上述方式來表示?(每格請填入兩個數字或字母的組合,如 00, 2b, 08…, 英文字母請用小寫)
 
__(1)__: __(2)__: __(3)__ : __(4)__ : __(5)__ : __(6)__   

2.18. An Ethernet adaptor (Network card) will receive all the frames from the link but only accept (handle) what kind of frames ?乙太網路介面卡(網路卡)從鏈結會收到所有的訊框,但它只會接受何種訊框?
(a)Frames addressed to its own address 目的地位址為自己地址的訊框
(b)Frames addressed to all unicast address 所有目的地位址為單點傳播地址的訊框
(c)Frames addressed to the broadcast address 目的地位址為廣播地址的訊框
(d)Frames addressed to all multicast addresses 目的地位址為所有群播地址的訊框
(e)Frames addressed to a multicast address and it has been instructed 目的位址為一群播位址, 而此主機有加入該群組

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