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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 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 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
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-sensitive application?
A E-mail 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 E-mail 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 80 D 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 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 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. 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 message’s 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 doesn’t impose this restriction.
20. The headers in the MIME message must include except .
A From B Content-type C Content-transfer-encoding D MIME 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 classes of DNS server except .
A Root DNS server B Local DNS server
C TLD server D Authoritative DNS server
24. DNS provides some services except .
A Host aliasing B Mail server aliasing
C Load distribution D A single point of failure
25. There are three architectures for locating content in P2P file sharing, KaZaA uses .
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 uses .
A Centralized Directory (p137)
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 server and then back to the client is .
A round-travel time B next-hop time
C round-trip time D prefix-matching time
29. 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 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 used to send user password to the server.
A User 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
C to send an E-mail to the receiving user agent
D to indicate what type the message is
33. In the four following options, which application is organized as hybrid of C/S and P2P architecture?
A E-mail B OICQ C File transfer D Web application
34. In the four following options, which is not a centralized DNS design’s problem?
A a single point of failure
B traffic volume
C distant centralized database
D slow (maintenance)
35. In the following options, from the application developer’s perspective, which is not correct?
A the network architecture is fixed
B the network architecture provides a specific set of services to applications
C the application architecture is designed by the physical devices
D the application architecture dictates how the application is organized over the various end systems
36. There are three predominant architectures used in modern network applications, which one is not included?
A the client-server architecture B the P2P architecture
C a hybrid of the client-server and P2P architecture
D a hybrid of the client-server and browser-server architecture
37. 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 architecture, 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.
38. are often used to create a powerful virtual server in C/S architecture.
A Peers B Server farm C server stack D local server
39. A process sends messages into, and receives messages from, the network through its .
A socket B program C client D peer
40. Which one is not defined by an application-layer protocol?
A the types of messages exchanged
B the syntax of various message types
C the semantics of the fields
D rules for determining when and how to translate the socket
41. HTTP can use two types of connections, which are .
A persistent and non-persistent connection
B connection with pipelining and without pipelining
C TCP and UDP
D parallel and serial connection
42. takes for a small packet to travel from client to server and then back to the client.
A RDT B threshold C RTT D overhead
43. The default mode of HTTP uses .
A non-persistent connection with pipelining
B non-persistent connection without pipelining
C persistent connection with pipelining
D persistent connection without pipelining
44. In HTTP request messages, the request line has three fields, there are .
A the method field, the URL field and the HTTP version field
B the method, the connection and URL field
C the user-agent, the method and HTTP version field
D the user-agent, the URL and the HTTP version field
45. In the header lines of HTTP request message, if the field of Connection is close, it specifies .
A the host on which object resides
B what type of the user agent
C that the browser wants the server to close the connection after sending the requested object
D which language can the browser receive
46. In HTTP response message, if the status code is 404, it means .
A request succeeded and the information is returned in the response
B requested object has been permanently moved
C the requested HTTP protocol version is not supported by the server
D the requested document does not exist on this server
47. 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 server
48. 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 institution’s access link to the Internet.
49. The request message in the conditional GET must include the header line.
A Last-Modified B Last-Referenced
C If-Modified-Since D If –Referenced-Since
50. FTP uses two parallel connections to transfer a file, they are .
A TCP and UDP connection
B connection with pipelining and without pipelining
C control an data connection
D client-server and browser-server connection
51. 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 RETR
52. 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 TCP
53. The two key MIME headers for supporting multimedia are .
A Content-Type and MIME-Version
B Content-Type and Content-Transfer-Encoding
C Content-Transfer-Encoding and MIME-Version
D MIME-Version and MIME-Type
54. For Internet mail, the mail access protocol is used to .
A transfer mail from the recipient’s mail server to the recipient’s user agent
B transfer mail from the sender’s mail server to the recipient’s mail server
C translate the mail from the sender’s mail server
D translate the mail into the recipient’s mail server
55. POP3 progresses through three phases, which they are .
A authorization, translation and transaction
B authorization, translation and update
C authorization, transaction and update
D translation, transaction and update
56. In the following four services, which one can not provide by DNS?
A Host aliasing B Mail server aliasing
C translate hostname to IP addresses
D translate MAC addresses to IP addresses
57. There are three classes of DNS servers, there are .
A root DNS server, top-level domain DNS server and local DNS server
B root DNS server, top-level domain DNS server and authoritative DNS server
C root DNS server, local DNS server and authoritative DNS server
D root DNS server, local DNS server and top-level domain DNS server
58. In the following four options about POP3, which one is not correct?
A The user agent employed only three commands: List, Retr and Quit
B The server does not carry state information across POP3 sessions
C The port number is 110
D The POP3 protocol does not provide any means for a user to create remote folders and assign messages to folders.
59. A resource record in DNS distributed database is a four-tuple, which field can be ignored?(p132) A Name B Value C Type D TTL
60. In the following four options about DNS
resource record, which one is correct?
A The meaning of Name and Value depend on Type.
B The meaning of Value and Type depend on Name.
C If Type=A, then Name is a domain and Value is the IP address for the hostname.
D If Type=MX, then Name is domain and Value is the IP address for the hostname.
61. In the following four options about DNS messages, which one is not correct?
A There are only two kinds of DNS message.(p133)
B Both query and reply message have the same format.
C The header section in DNS message has 12 bytes.
D The authority section contains the resource records for the same that was originally queried.
62. In DNS message, contains information about the query that is being made.(p133)
A authority section B question section C answer section D additional section
63. There are three techniques are employed in most any P2P file-sharing systems, which one is not include? （p144）
A Request queuing B incentive priorities C parallel downloading D Response queuing
64. In the following four option
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