计算机网络题库(大连交通大学)chapter2(3)

C The network architecture is designed by application developer.

D The network architecture dictates how the application is organized over special server. 73. In Client-Server architecture, the clients visit the server’s through . A client’s socket B client’s IP address C server’s socket D server’s IP address

74. can be thought of as a program that is running within end system. A process B thread C socket D context 75. API means . A Application Program Interface B Application Process Interface C Appellation Program Interface D Appellation Process Interface

76. One host can be running many network applications, so the system assigns them different to distinguish each other.

A IP address B port number C hostname D section 77. In the following four applications, which one is both bandwith-sensitive and require tight timing constraints?

A real-time audio B file transfer C E-mail D Web documents 78. The port number of the Web server is .

A 25 B 20 C 80 D 8080 79. The port number of the mail server is .

A 25 B 20 C 80 D 8080

80. Look the URL http://www.djtu.edu.cn/rjxy/index.html, the object’s path name is . A www.djtu.edu.cn B www.djtu.edu.cn/rjxy C /rjxy/index.html D index.html 81. Each URL has components, they are .

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A transport protocol and object’s path name B host name and object’s path name C transport protocol and host name D client name and server name

1. Consider an HTTP client will request a WEB page from a WEB server. Suppose the URL of the page is www.stdjtu.edu.cn/somedepartment /somedir/exp.html. The client does not want to use persistent connections and want to receive French version of the object. The user agent is Windows NT 5.1. Give the request message according to the given format.

Request line: Header lines:

2. Telnet into a Web server and send a multiline request message. Include in the request message the If-modified-since: header line to force a response message with the 304 Not Modified status code. Solution:

Request line: Header lines:

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3. Suppose within you Web browser you click on a link to obtain a Web page. The IP address for the associated URL is not cached in your local host, so a DNS look-up is necessary to obtain the IP address. Suppose that n DNS servers are visited before your host receives the IP address from DNS; the successive visits incur an RTT of RTT1,…，RTTn. Further suppose that the Web page associated with the link contains exactly one object, consisting of a small HTML text. Let RTT0 denote the RTT between the local host and the server containing the object. Assuming zero transmission time of the object, how much time elapses from when the client clicks on the link until the client receives the object?

5. Suppose that you send an e-mail message whose only data is a microsoft excell attachment. What might the header lines (including MIME lines) look like?

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