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.
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.
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
西南亚4. In the following applications, which one is a loss-tolerant application?
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A E-mail
B file transfer
C instant messaging
D real-time audio
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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 .
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?
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 .
A 2RTT
B 8RTT
C 12 RTT
D 14RTT
10. In HTTP respon message, if the requested HTTP protocol v ersion 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
口算练习题C 80
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.
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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
admitted
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.
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 .
A HTTP is a push protocol, and SMTP is a pull protocol.
B In the default mode, both of them u persistent connection.
ts into one message, and SMTP nds every object C HTTP places all of the message’s objec
one by one.
D HTTP requires each message to be in 7-bit ASCII format, and SMTP doesn’t impo t restriction.
20. The headers in the MIME message must include except .
A From
B Content-type
C Content-transfer-encoding
D MIM
E version
11~15CCBAB 16~20 DDBBD
21. In the following protocol, which one is stateless?
A POP3
B SMTP
C FTP
D IMAP
22. DNS means .
A Data Name System
B Data National System
C Domain Name System
D Domain National System
23. There are three class of DNS rver except .
A Root DNS rver
B Local DNS rver
C TL
D rver D Authoritative DNS rver
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24. DNS provides some rvices except .
A Host aliasing
B Mail rver aliasing
C Load distribution
D A single point of failure
25. There are three architectures for locating content in P2P file sharing, KaZaA us .
A Centralized Directory （Napster）
B Query Flooding(Gnutella)
C Exploiting Heterogeneity (p141)
D Incentive Priorities
26. There are three architectures for locating content in P2P file sharing, Napster us .
A Centralized Directory (p137)
珠三角九市B Query Flooding
C Exploiting Heterogeneity
D Incentive Priorities
27. The following architectures in P2P file sharing, which is an overlay network?
A Centralized Directory
B Query Flooding(p139)
C Exploiting Heterogeneity
D Incentive Priorities
28. The time it takes for a small packet to travel from client to rver and then back to the client is .
A round-travel time
B next-hop time
C round-trip time
D prefix-matching time
29. Suppo A ( with a Web-bad e-mail account ) nds a message to B ( who access his mail rver using POP3), which application-layer protocol is not ud?
A HTTP
B SMTP
C POP3
D IMAP
30. In the four following options, which protocol is included in Mail Access Protocol?
A SMTP
B DHCP
C IMAP
D FTP
31. In FTP commands, is ud to nd ur password to the rver.
A Ur
B Pass
C Retr
D Stor
32. The function of the additional header field in MIME Content-Type is .
A to convert the message body to its origin non-ASCII form
B to determine what actions it should take on message body
