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1、1 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 architectur
2、e,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,r
3、eceiving 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 ne
4、twork 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 audio5.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
5、 of TCP cant 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?名师资料总结-精品资料欢迎下载-名师精心整理-第 1 页，共 17 页 -2 A E-mail B web application C file transfer D DNS8.In the follow
6、ing 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
7、 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 15 CACDC 610 CDABD 11.The port n
8、umber 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 serverD edge server 13.In the following descriptions about persistent connection,which one is not correct?A The server leaves
9、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.名师资料总结-精品资料欢迎下载-名师精心整理-第 2 页，共 17 页 -3 D The default mode of HTTP uses persistent connection w
10、ith 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,
11、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
12、 they are.A user agent,SMTP,POP3 B SMTP,POP3,IMAP C 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 coul
13、d 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,an
14、d SMTP sends every object 名师资料总结-精品资料欢迎下载-名师精心整理-第 3 页，共 17 页 -4 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 version 1115CCB
15、AB 1620 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 serverC TLD server D Authori
16、tative 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 H
17、eterogeneity(p141)D Incentive Priorities 名师资料总结-精品资料欢迎下载-名师精心整理-第 4 页，共 17 页 -5 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 P2
18、P 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 pr
19、efix-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 IMAP30.In the four following options,which protocol is included in Mail Access Protocol?A SMTP B DHCP C IM
20、AP D FTP 31.In FTP commands,is used to send user password to the server.A User B PassC 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 名师资料总结-精品资料欢
21、迎下载-名师精心整理-第 5 页，共 17 页 -6 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,w
22、hich 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
23、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 application
24、s,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
25、 is an always-on host,called the server.名师资料总结-精品资料欢迎下载-名师精心整理-第 6 页，共 17 页 -7 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
26、 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 exchange
27、d 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 paralle
28、l 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
29、pipelining 名师资料总结-精品资料欢迎下载-名师精心整理-第 7 页，共 17 页 -8 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 H
30、TTP 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 sen
31、ding 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 b
32、y 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 cach
33、e is both a server and a client at the same time.B A web cache is purchased and installed by an ISP.名师资料总结-精品资料欢迎下载-名师精心整理-第 8 页，共 17 页 -9 C A web cache can raise the response time for a client request.D A web cache can reduce traffic on an institutions access link to the Internet.49.The request mes
34、sage 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 connect
35、ion 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 ag
36、ents 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
37、 transfer mail from the recipients mail server to the recipients user agentB transfer mail from the senders mail server to the recipients mail server名师资料总结-精品资料欢迎下载-名师精心整理-第 9 页，共 17 页 -10 C translate the mail from the senders mail serverD translate the mail into the recip ient s mail server55.POP3
38、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 serv
39、er 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 serv
40、er,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 acro
41、ss 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 名师资料总结-精品资料欢迎下载-名师
42、精心整理-第 10 页，共 17 页 -11 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 i
43、s 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 sect
44、ion 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-shar
45、ing systems,which one is not include?（p144）A Request queuing B incentive priorities C parallel downloading D Response queuing 64.In the following four options about P2P file-sharing,which one is not correct?A P2P file-sharing is highly scalable.B P2P file-sharing relies on P2P architecture.C The mea
46、ns for locating content in different P2P file-sharing are different.D P2P file-sharing systems not only share MP3s,but also videos,software,documents and images.65.In MIME header lines,specifies the name of the SMTP server that sent the message(f名师资料总结-精品资料欢迎下载-名师精心整理-第 11 页，共 17 页 -12 rom),the name
47、 of the SMTP server that received the message(by),and the time an which the receiving server received the message.A Received B From C To D MIME-Version 66.If the header line Connection is close,it means that the client wants.A persistent connection with pipelining B persistent connection without pip
48、elining C nonpersistent connection D not connection 67.In HTTP request message,the entity body is empty with the method,but is used with the method.A GET,POST B POST,GET C GET,HEAD D POST,HEAD 68.In HTTP response message,if the Date:header;one indicates the time Fri.08 Aug.2008 12:00:00 GMT,the Last
49、-Modified:header line can not be.A Fri.08 Aug.2008 11:00:00 GMT B Fri.08 Aug.2008 11:30:00 GMT C Fri.08 Aug.2008 12:00:00 GMT D Fri.08 Aug.2008 12:30:00 GMT69.In the following four options,which one is not the part of cookie technology?A Cookie header lines in the HTTP response message and request m
50、essage.B One cookie header file kept on the user s end system and managed by the user s browser.C A network entity that satisfies HTTP requests on the behalf of an origin Web server.D A back-end database at the Web site 70.On-top of stateless HTTP,can be used to create a user session layer.A proxy s