复习题chapter.docx

1、复习题chapterChapter 2 Application Layer1. In the following four descriptions, which one is correct? A In C/S architecture, clients communicate with each other directly.B In C/S architecture, client has a fixed well-known address.C In P2P architecture, peers communicate with each other directly. 在对等网络结

2、构中，同行相互直接联系。D In P2P architecture, peer has a fixed well-known address.2. In the context of a communication session between a pair of process, the process that initiates the communication is labeled as the , the process that waits to be contacted to begin the session is labeled as the .A client proc

3、ess, server process B sending process, receiving processC input process, output process D communicating process, connecting process3. A socket is the interface between within a host. A the network layer and the link layerB the link layer and the physical layerC the application layer and the transpor

4、t layerD the transport layer and the network layer4. In the following applications, which one is a loss-tolerant application? A E-mail B file transfer C instant messaging D real-time audio5. In the following applications, which one is a bandwidth-sensitive application? A E-mail B web application C r

5、eal-time audio D file transfer6. The service of TCP cant guarantee .A delivery of all data without error B delivery of all data in the proper orderC the rate of delivery D congestion control7. In the following applications, which one uses UDP （User Datagram Protocol 用户数据报协议）? A E-mail B web applicat

6、ion C file transfer D DNS Domain Name Server,域名服务器8. In the following descriptions about HTTP（Hypertext Transfer Protocol）, which one is not correct? A HTTP uses non-persistent connections in its default mode. 超文本传输协议使用非持久连接的默认模式。B HTTP uses TCP as its underlying transport protocol. 超文本传输协议使用协议作为底层传

7、输协议C HTTP is a stateless protocol. 是一种无状态协议D HTTP is client-server architecture.10. In HTTP response message, if the requested HTTP protocol version is not supported, the status code is .A 200 B 301 C 400 D 50511. The port number of web application is .A 25 B 20 C 80 D 5312. A network entity that sa

8、tisfies HTTP requests on the behalf of an origin web server is .A server farm B server stack C proxy server（代理服务器） D edge server13. In the following descriptions about persistent connection持久连接, which one is not correct? A The server leaves the TCP connection open after sending a response.B Each TCP

9、 connection is closed after the server sending one object.C There are two versions of persistent connection: without pipelining and with pipelining.D The default mode of HTTP uses persistent connection with pipelining.14. FTP（File Transfer Protocol 文件传送输协议） uses two parallel TCP connections to trans

10、fer a file, there are .A control connection and data connectionB receiving connection and sending connectionC client connection and sever connectionD program connection and process connection15. In the following descriptions about FTP, which one is correct?A FTP is p2p architecture. B FTP sends its

11、control information out-of-band. 服务器发送的控制信息带C FTP uses persistent connection. D FTP is a stateless protocol. 17. The Internet mail system has three components which they are .A user agent, SMTP, POP3 B SMTP, POP3, IMAPInternet Message Access Protocol消息访问协议C user agent, SMTP, IMAP D user agent, SMTP（

12、Simple Message Transfer Protocol 简单邮件传输协议）, mail server18. If the status code in HTTP response message is 404, it means .A Request succeeded. B The requested document doesnt exit on this server.C This is a generic error code indicating that the request could not be understood by the server.D Request

13、ed 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 of them use persistent connection.C HTTP places all of the messages objects into one message, and SMTP sends every object one by one.

14、D HTTP requires each message to be in 7-bit ASCII format, and SMTP doesnt impose this restriction.21. In the following protocol, which one is stateless? A POP3和HTTP B SMTP C FTP D IMAP22. DNS means .A Data Name System B Data National SystemC Domain Name System域名服务器 D Domain National System23. There

15、are three classes of DNS server except .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 failure28. The time it takes for a small packet to travel from clien

16、t to server and then back to the client is .A round-travel time B next-hop timeC round-trip time 往返时间 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

17、 POP3 D IMAP30. In the four following options, which protocol is included in Mail Access 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多用途的网际邮件扩充协议Content-Type is

18、.A to convert the message body to its origin non-ASCII formB to determine what actions it should take 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 peer-to

19、-peer architecture? A E-mail B OICQ C File transfer D Web application35. 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 arc

20、hitecture is designed by the physical devices设备；装置D the application architecture dictates how the application is organized over the various end systems36. There are three predominant主要的，占主导地位的architectures used in modern network applications, which one is not included? A the client-server architectu

21、re B the P2P architectureC 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 archite

22、cture, there is an always-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.39. A process sends messages into, and receives messages from, the network through its .A socket B program C client D peer40. Whi

23、ch 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 types of connections, which are .A persistent and non-persistent

24、 connectionB connection with pipelining流水线操作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 default mode of HTTP（和SMTP） uses .A non-persistent connect

25、ion 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 （Uniform Resource Locator统一资源定位器） field and the HT

26、TP 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 object residesB wha

27、t 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 reques

28、ted 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 the behalf of an origin Web server.A proxy server B local server C DNS server D Web s

29、erver48. In the following four options about web cache, which one is not correct? A A web cache is both a server and a client at the same time.B A web cache is purchased and installed by an ISP.C A web cache can raise the response time for a client request.D A web cache can reduce traffic on an inst

30、itutions access link to the Internet.49. The request message in the conditional GET must include the header line.A Last-Modified B Last-ReferencedC If-Modified-Since D If Referenced-Since50. FTP uses two parallel connections to transfer a file, they are .A TCP and UDP connectionB connection with pip

31、elining and without pipeliningC control and data connectionD client-server and browser-server connection51. In FTP commands, which one is used to ask the server to send back a list of all files in the current remote directory? A USER B PASS C LIST D RETR52. In the Internet mail system, allow users to read, reply to, forward, save and compose message.A User agents B mail servers C SMTP D TCP53. The two key MIME headers for supporting multimedia are .A Content-Type and MIME-VersionB Content-Type and Content-Transfer-EncodingC Content-Transfer-E