Chapter 2 Application Layer
1. In the following four descriptions, which one is correct?
A In C/S architecture, clients communicate with each other directly.
例假有血块正常吗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 ssion 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 ssion is labeled as the .
A client process, rver process B nding process, receiving process
C input process, output process D communicating process, connecting process
3. A socket is the interface between within a host. 铬渣
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 E-mail B file transfer C instant messaging D real-time audio
5. In the following applications, which one is a bandwidth-nsitive application?
A E-mail B web application C real-time audio D file transfer
6. The rvice of TCP can’t guarantee .
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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 us UDP?
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A E-mail B web application C file transfer D DNS
8. In the following descriptions about HTTP, which one is not correct?
A HTTP us non-persistent connections in its default mode.
B HTTP us TCP as its underlying transport protocol.
C HTTP is a stateless protocol.
D HTTP is client-rver architecture.
9. Suppo a web page consists of a ba HTML file, 5 JEPG images and a java applet, and also suppo HTTP us persistent connection without pipelining, the total respon time is .
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A 2RTT B 8RTT C 12 RTT D 14RTT
10. In HTTP respon 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 80走天涯叶贝文 D 53
12. A network entity that satisfies HTTP requests on the behalf of an origin web rver is .
A rver farm B rver stack C proxy rver D edge rver
13. In the following descriptions about persistent connection, which one is not correct?
A The rver leaves the TCP connection open after nding a respon.
B Each TCP connection is clod after the rver nding one object.
C There are two versions of persistent connection: without pipelining and with pipelining.
D The default mode of HTTP us persistent connection with pipelining.
14. FTP us two parallel TCP connections to transfer a file, there are .
A control connection and data connection
B receiving connection and nding connection
C client connection and ver 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 nds its control information out-of-band.
C FTP us persistent connection. D FTP is a stateless protocol.
16. In the commands of FTP, which one does not have parameter?
A USER B PASS C LIST D STOR
17. The Internet mail system has three components which they are .
A ur agent, SMTP, POP3 B SMTP, POP3, IMAP
C ur agent, SMTP, IMAP D ur agent, SMTP, mail rver
18. If the status code in HTTP respon message is 404, it means .
A Request succeeded.
B The requested document doesn’t exit on this rver.
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C This is a generic error code indicating that the request could not be understood by the rver.
D Requested object has been permanently mover.
19. Comparison HTTP with SMTP, the correct is .
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A HTTP is a push protocol, and SMTP is a pull protocol.
