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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?
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| (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. |
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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 ?
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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)__
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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?
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| (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 |