計算機網(wǎng)絡(luò)英文試題庫(附答案)chapter3-資料下載頁
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【正文】 transport services that the Internet provides to the applications. A TCP and UDP B connectionoriented and connectionless serviceC TCP and IP D reliable data transfer and flow control102. In the following descriptions about persistent connection, which one is not correct? A The server leaves the TCP connection open after sending a responseB Each TCP connection is closed after the server sending one objectC There are two versions of persistent connection: without pipelining and with pipeliningD The default mode of HTTP uses persistent connection with pipelining103. The field of Length in UDP segment specifies the length of ____. A the UDP segment, not including the headerB the UDP segment, including the headerC the UDP segment’s headerD the Length field104. In TCP segment header, which field can implement the reliable data transfer? A source port number and destination port number B sequence number and ACK numberC urgent data pointer D Receive window105. In the following four descriptions about TCP connection management, which one is not correct? A Either of the two processes participating in a TCP connection can end the connectionB If the FIN bit is set to 1, it means that it wants to close the connectionC In the first two step of the threeway handshake, the client and server randomly choose an initial sequence numberD In the three segments of the threeway handshake, the SYN bit must be set to 1106. Suppose host A sends two TCP segments back to back to host B over a TCP connection. The first segment has sequence number 42, and the second has sequence number 110. If the 1st is lost and 2nd arrives at host B. What will be the acknowledgment number? A 43 B ACK42C 109 D ACK1101. Consider sending an object of size O=500,000bytes from server to client. Let S=500 bytes and RTT=. Suppose the transport protocol uses static windows with window size 5. For a transmission rate of 100Kbps, determine the latency for sending the whole object. Recall the number of windows K=O/ WS), and there is K1 stalled state (that is idle time gaps). the following plot of TCP congestion window size as a function of time.14180263000264810121620222402832Congestion window sizeTransmission round481216Fill in the blanks as follow:a) The initial value of Threshold at the first transmission round is ____.b) The value of Threshold at the 11st transmission round is ____.c) The value of Threshold at the 21st transmission round is ____.d) After the 9th transmission round, segment loss detected by ____. (A) Timeout (B) Triple duplicate ACKe) After the 19th transmission round, segment loss detected by ____. (A) Timeout (B) Triple duplicate ACKf) During ____ transmission round, the 18th segment is sent. the TCP reliable data transfer in the given graph. If in Segment 1’s Sequence number =10,data=“AC”, please fill in the following blanks.a) In Segment 2, ACK number=____。 b) In Segment 3, Sequence number =____。 data=“0123456789” c) If there are some bits corrupted in segment 3 when it arrives Host B, then the ACK number in Segment 5 is ____。 and the ACK number in Segment 6 is ____. 1 3 4 6 2 5 74. The client A wants to request a Web page from Server B. Suppose the URL of the page is , and also it wants to receive French version of object. The timesequence diagram is shown below, please fill in the blanks. 12345Packet① to Packet③ are TCP connection’s segment, then:Packet ①: SYN flag bit= a ACK flag bit= b Sequence number= 92Packet ②: SYN flag bit=1 ACK flag bit= c Sequence number=100Packet ③: SYN flag bit= d ACK flag bit=1 Sequence number= e 5. Consider sending an object of size O=100 Kbytes from server to client. Let S=536 bytes and RTT=100msec. Suppose the transport protocol uses static windows with window size W. (1) For a transmission rate of 25 kbps, determine the minimum possible latency. Determine the minimum window size that achieves this latency. (2) Repeat (1) for 100 kbps.6. Consider the following plot of TCP congestion window size as a function of time. Please fill in the blanks as below. 14182630026481012162022242832Congestion window sizeTransmission round481216a) The initial value of Threshold at the first transmission round is____.b) The value of Threshold at the 11th transmission round is_____. c) The value of Threshold at the 21st transmission round is_____. d) After the 9th transmission round, _____ occurs. e) After the 19th transmission round, ____ are detected.寧可累死在路上，也不能閑死在家里！寧可去碰壁，也不能面壁。是狼就要練好牙，是羊就要練好腿。什么是奮斗？奮斗就是每天很難，可一年一年卻越來越容易。不奮斗就是每天都很容易，可一年一年越來越難。能干的人，不在情緒上計較，只在做事上認真；無能的人！不在做事上認真，只在情緒上計較。拼一個春夏秋冬！贏一個無悔人生！早安！—————獻給所有努力的人. 學(xué)習(xí)好幫
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