Chapter 2 Application Layer
1. In the following four descriptions, which one is correct"
A  In C/S architecture, clients municate with each other directly.
B  In C/S architecture, client has a fixed well-known address.
C  In P2P architecture, peers municate with each other directly.
D  In P2P architecture, peer has a fixed well-known address.
2. In the context of a munication session between a pair of process, the process that initiates the munication 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 process
C  input process, output process      D  municating process, connecting process
3. A socket is the interface between within a host.
A  the network layer and the link layer
B  the link layer and the physical layer
C  the application layer and the transport layer
D  the transport layer and the network layer
4. In the following applications, which one is a loss-tolerant application"
A      B  file transfer  C  instant messaging    D  real-time audio
5. In the following applications, which one is a bandwidth-sensitive application"
A      B  web application  C  real-time audio D  file transfer
6. The service of TCP can’t guarantee .
A  delivery of all data without error    B  delivery of all data in the proper order
C  the rate of delivery  D  congestion control
7. In the following applications, which one uses UDP"
A      B  web application    C  file transfer    D  DNS
8. 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  14RTT
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  505
1~5    CACDC           6~10  CDABD
11. The port number of web application is .
A  25        B  20 C  80D  53
12. 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 server
13. 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 connection
B  receiving connection and sending connection
C  client connection and sever connection
D  program connection and process connection
15. 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. In the mands of FTP, which one does not have parameter" 
 A  USER           B  PASS             C  LIST            D  STORpeer
17. The Internet mail system has three ponents which they are .
A  user agent, SMTP, POP3            B  SMTP, POP3, IMAP
C  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 doesn’t 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. parison 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 message’s objects into one message, and SMTP sends every object one by one.

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