计算机网络英文题库附答案chapter2Word格式.docx

1、7. In the following applications, which one uses UDP A E-mail B web application C file transfer D DNS8. In the following descriptions about HTTP, which one is not correct ；A HTTP uses non-persistent connections in its default mode.B HTTP uses TCP as its underlying transport protocol.C HTTP is a stat

2、eless protocol.D HTTP is client-server architecture.9. Suppose a web page consists of a base HTML file, 5 JEPG images and a java applet, and also suppose HTTP uses persistent connection without pipelining, the total response time is .A 2RTT B 8RTT C 12 RTT D 14RTT10. In HTTP response message, if the

3、 requested HTTP protocol version is not supported, the status code is .A 200 B 301 C 400 D 50515CACDC610CDABD11. The port number of web application is .A 25 B 20 C 80 D 5312. A network entity that satisfies HTTP requests on the behalf of an origin web server is .A server farm B server stack C proxy

4、server D edge server13. In the following descriptions about persistent connection, which one is not correct A The server leaves the TCP connection open after sending a response.$B Each TCP connection is closed after the server sending one object.C There are two versions of persistent connection: wit

5、hout pipelining and with pipelining.D The default mode of HTTP uses persistent connection with pipelining.14. FTP uses two parallel TCP connections to transfer a file, there are .A control connection and data connectionB receiving connection and sending connectionC client connection and sever connec

6、tionD program connection and process connection15. In the following descriptions about FTP, which one is correctA FTP is p2p architecture. B FTP sends its control information out-of-band.C FTP uses persistent connection. D FTP is a stateless protocol.16.InthecommandsofFTP,whichonedoesnothaveparamete

7、rAUSERBPASSCLISTDSTOR17. The Internet mail system has three components which they are .A user agent, SMTP, POP3 B SMTP, POP3, IMAPC user agent, SMTP, IMAP D user agent, SMTP, mail server:18. If the status code in HTTP response message is 404, it means .A Request succeeded. B The requested document d

8、oesnt exit on this server.C This is a generic error code indicating that the request could not be understood by the server.D Requested object has been permanently mover.19. Comparison HTTP with SMTP, the correct is .A HTTP is a push protocol, and SMTP is a pull protocol.B In the default mode, both o

9、f them use persistent connection.C HTTP places all of the messages objects into one message, and SMTP sends every object one by one.D HTTP requires each message to be in 7-bit ASCII format, and SMTP doesnt impose this restriction.20. The headers in the MIME message must include except .A From B Cont

10、ent-type C Content-transfer-encoding D MIME version1115CCBAB1620DDBBD21. In the following protocol, which one is stateless A POP3 B SMTP C FTP D IMAP22. DNS means .A Data Name System B Data National SystemC Domain Name System D Domain National System23. There are three classes of DNS server except .

11、A Root DNS server B Local DNS serverC TLD server D Authoritative DNS server24. DNS provides some services except .A Host aliasing B Mail server aliasingC Load distribution D A single point of failure25.TherearethreearchitecturesforlocatingcontentinP2Pfilesharing,KaZaAuses.CentralizedDirectory（Napste

12、r）QueryFlooding（Gnutella）ExploitingHeterogeneity（p141）IncentivePriorities26.Napster.（p137）FloodingPriorities27.ThefollowingisanoverlaynetworkFlooding（p139）*28. The time it takes for a small packet to travel from client to server and then back to the client is .A round-travel time B next-hop timeC ro

13、und-trip time D prefix-matching time29. Suppose A （ with a Web-based e-mail account ） sends a message to B （ who accesses his mail server using POP3）, which application-layer protocol is not used A HTTP B SMTP C POP3 D IMAP30. In the four following options, which protocol is included in Mail Access

14、Protocol A SMTP B DHCP C IMAP D FTP31. In FTP commands, is used to send user password to the server.A User B Pass C Retr D Stor32. The function of the additional header field in MIME Content-Type is .A to convert the message body to its origin non-ASCII formB to determine what actions it should take

15、 on message bodyC to send an E-mail to the receiving user agentD to indicate what type the message is33. In the four following options, which application is organized as hybrid of C/S and P2P architecture A E-mail B OICQ C File transfer D Web application34.fouroptions,acentralizedDNSdesignsproblemsi

16、nglepointfailuretrafficvolumedistantdatabaseslow（maintenance）35.In the following options, from the application developers perspective, which is not correct A the network architecture is fixedB the network architecture provides a specific set of services to applicationsC the application architecture

17、is designed by the physical devicesD the application architecture dictates how the application is organized over the various end systems36. There are three predominant architectures used in modern network applications, which one is not included A the client-server architecture B the P2P architecture

18、C a hybrid of the client-server and P2P architectureD a hybrid of the client-server and browser-server architecture37. In the following options about C/S architecture, which is not correct A In C/S architecture, there is an always-on host, called the server.B In C/S architecture, there is an always-

19、on host, called the client.C The server has a fixed, well-known address, called IP address.D Clients do not directly communicate with each other.38.oftenusedtocreatepowerfulvirtualserverC/Sarchitecture.PeersServerfarmstacklocalserver39. A process sends messages into, and receives messages from, the

20、network through its .A socket B program C client D peer40. Which one is not defined by an application-layer protocol A the types of messages exchangedB the syntax of various message typesC the semantics of the fieldsD rules for determining when and how to translate the socket41. HTTP can use two typ

21、es of connections, which are .A persistent and non-persistent connectionB connection with pipelining and without pipeliningC TCP and UDPD parallel and serial connection42. takes for a small packet to travel from client to server and then back to the client.A RDT B threshold C RTT D overhead43. The d

22、efault mode of HTTP uses .A non-persistent connection with pipeliningB non-persistent connection without pipeliningC persistent connection with pipeliningD persistent connection without pipelining44. In HTTP request messages, the request line has three fields, there are .A the method field, the URL

23、field and the HTTP version fieldB the method, the connection and URL fieldC the user-agent, the method and HTTP version fieldD the user-agent, the URL and the HTTP version field45. In the header lines of HTTP request message, if the field of Connection is close, it specifies .A the host on which obj

24、ect residesB what type of the user agentC that the browser wants the server to close the connection after sending the requested objectD which language can the browser receive46. In HTTP response message, if the status code is 404, it means .A request succeeded and the information is returned in the responseB requested object has been permanently movedC the requested HTTP protocol version is not supported by the serverD the requested document does not exist on this server47. is a network entity that satisfies HTTP requests on th