Chapter 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.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 process, 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 transport 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 real-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? 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 stateless 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 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 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: without 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 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 control information out-of-band.C FTP uses persistent connection. D FTP is a stateless protocol.16.InthecommandsofFTP,whichonedoesnothaveparameter?AUSERBPASSCLISTDSTOR17. 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 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 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 of 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 Content-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