计算机网络教程自顶向下方法选择题及答案 Chapt 2 Application LayerQUIZWord格式.docx

1、D） the client must be running all the time but the server needs to be running only when it is needed3. The first section of a URL identifier is the _.A） protocolB） pathC） hostD） port4. A _ document is a fixed-content document that is created and stored in a server. The client can get a copy of the d

2、ocument only.A） staticB） dynamicC） activeD） None of the choices are correct5. _ is a language for creating a static document.A） Extensible Style Language （XSL）B） Hypertext Markup Language （HTML）C） Extensible Markup Language （XML）D） All choices are correct6. A _ document is created by a Web server wh

3、enever a browser requests the document.7. For many applications, we need a program or a script to be run at the client site. These are called _ documents.8. HTTP uses the services of _.A） UDPB） IPC） TCPD） DNS9. In HTTP, the first line in a request message is called a _ line; the first line in the re

4、sponse message is called the _ line.A） request; responseB） status;C） status; status10. In a _ connection, one TCP connection is made for each request/response.A） persistentB） nonpersistentC） persistent or a nonpersistent11. In a _ connection, the server leaves the connection open for more requests a

5、fter sending a response.C） persistent or nonpersistent12. In HTTP, _ server is a computer that keeps copies of responses to recent requests.A） a regularB） a proxyC） an auxiliaryD） a remote13. An HTTP request message always contains _.A） a header line and a bodyB） a request line and a header lineC） a

6、 request line, a header line, and a bodyD） a request line, a header line, a blank line, and a body14. Which of the following is present in both an HTTP request line and a status line?A） version numberB） URLC） status codeD） method15. FTP uses the services of _.D） none of the choices are correct16. In

7、 FTP, _ well-known port（s） is （are） used.A） oneB） twoC） threeD） four17. During an FTP session the control connection is opened _.A） onceB） twiceC） many times18. During an FTP session the data connection may be opened _.A） only onceB） only two timesC） as many times as needed19. In FTP, a file can be

8、organized into records, pages, or a stream of bytes. These are types of an attribute called _.A） file typesB） data structuresC） transmission modes20. In FTP, there are three types of _: stream, block, and compressed.B） data types21. In FTP, ASCII, EBCDIC, and image define an attribute called _.A） fi

9、le typeB） data structureC） transmission mode22. In FTP, when we _, it is copied from the client to the server.A） retrieve a fileB） store a fileC） open a file23. In the common scenario, the electronic mail system needs _.A） two UAs, two MTAs and one MAAB） two UAs, two MTAs and two MAAsC） two UAs, two

10、 pairs of MTAs and a pair of MAAsD） two UAs, two pairs of MTAs and a two pairs of MAAs24. _ provides service to the user to make the process of sending or receiving a message easier.A） An MTAB） An MAAC） A UA25. An e-mail message contains the _ and the _.A） header; envelopB） header; bodyC） envelop;26

11、. In the Internet, an e-mail address consists of two parts: a _ and a _.A） local part; domain nameB） global part;C） label;D） local part; label27. _ is a supplementary protocol that allows non-ASCII data to be sent through e-mail.A） SMPTB） MPEGC） MIMED） POP28. The formal protocol that defines the MTA client and server i