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8.6. Which of the following fields of TCP header are involved in TCP's sliding window algorithm ?
TCP 滑動視窗演算法會使用下列哪些TCP 標頭的欄位 ?
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| (a) Acknowledgment | |
| (b) AdvertisedWindow | |
| (c) Destination port number | |
| (d) SequenceNum | |
| (e) Source port number |
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8.7. Which of the following statements about “sequence number” of TCP are correct ?
下列哪些對於TCP“序號”的敘述是正確的 ?
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| (a) TCP is a byte-oriented protocol and each byte of data has a sequence number. TCP是位元組導向服務協議,且每個位元組使用一個序號 | |
| (b) TCP is a byte-oriented protocol and each segment of data has a sequence number. TCP是位元組導向服務協議,且每個資料段使用一個序號 | |
| (c) The SequenceNum field of TCP header contains the sequence number for the first byte of data carried in that segment. TCP 標頭上的SequenceNum 欄位為此資料段上的第一個資料位元組的序號 | |
| (d) The SequenceNum field of TCP header contains the sequence number for the last byte of data carried in that segment. TCP 標頭上的SequenceNum 欄位為此資料段上的最後一個資料位元組的序號 | |
| (e) The SequenceNum field of TCP header has a length of 16 bits. TCP 標頭上的SequenceNum欄位長度為16 位元. |
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8.8. The TCP header includes six flags: SYN, FIN, RESET, PUSH, URG, and ACK. Which of the following statements about these flags are correct ?
TCP 標頭包含六個旗標: SYN、FIN、RESET、PUSH、URG與ACK。對於以上這些旗標,下列哪些敘述是正確的 ?
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| (a) The SYN and FIN flags are used when terminating and establishing a TCP connection, respectively. SYN 旗標與FIN 旗標分別被使用於中止與建立TCP 連線 | |
| (b) The ACK flag is set any time the Acknowledgment field is valid, implying that the receiver of this segment should pay attention to it. ACK 旗標設為 1 表示Acknowledgment欄位的值是有效的,暗示接收端應該注意此欄位值 | |
| (c) The URG flag signifies that this segment contains urgent data and the urgent data is contained at the bottom of the segment body. URG 旗標設為1表示此資料段包含緊急資料,而緊急資料會放在資料段的最後面部分 | |
| (d) The PUSH flag signifies that the sender invoked the push operation, which indicates to the receiving side of TCP that it should notify the receiving process of this fact. PUSH 旗標設為1表示傳送端觸發推擠動作,會指示TCP接收端應通知其接收應用程式有此動作 | |
| (e) The RESET flag signifies that the receiver wants to abort the connection. RESET 旗標設為1表示接收端想要中止此連線 |
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8.9. The Checksum field in TCP header is computed over the TCP header, the TCP data, and the “pseudoheader”. Which of the following fields are included in the “pseudoheader”?
TCP 標頭的Checksum欄位是根據TCP 標頭內容、TCP 資料與 “pseudoheader”計算得來。“pseudoheader” 包含下面哪些欄位 ?
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| (a) Source IP address of IP header IP 標頭的來源端IP位址 | |
| (b) Destination IP address of IP header IP 標頭的目的地端IP位址 | |
| (c) Length field of IP header. IP 標頭的長度欄位 | |
| (d) Source port of TCP header TCP 標頭的來源端口號 | |
| (e) Destination port of TCP header TCP標頭的目的地端口號 |