宁波大学计算机网络习题集.doc

(word完整版)宁波大学计算机网络习题集1。In communication links， transmission rate means:A、BandwidthB、propagation speedC、process speedD、router delays正确答案： A 2。All communication activities in Internet are governed by：A、ProtocolsB、WebMasterC、ClientD、ChinaTelecom正确答案： A 3。The center of internet structure is:A、Tier-1 ISPsB、Local ISPsC、Root DNSD、NAP正确答案： A 4.When congest occur in network， which delay become large?A、propagation delayB、queuing delayC、transmission delayD、processing delay正确答案： B 5。The internet protocols not define: A、order of messagesB、actions takenC、formatD、price正确答案： D 6.The internet protocols not define : A、actions takenB、order of messagesC、hackerD、format正确答案： C 7.Which is not the types of protocol data unit in TCP/IP？A、frameB、datetimeC、segmentD、message正确答案： B 8.Which is not a connected end system device in the internet？A、Mobile PhoneB、PC serverC、PC workstationD、Router正确答案： D 9.All communication activities in network are governed by ：A、ProtocolsB、ServersC、GovernmentD、Clients正确答案： A 10。For Queueing delay，in which state， average queuing delay small:A、La/R =0。1B、La/R =0。9C、La/R 1D、La/R 10正确答案： A 1应用层中的数据块常被称为:A、比特流B、帧C、分组D、消息正确答案： D 2在TCP/IP 层次协议中，传输层向应用层提供的接口是哪一个? A、PutB、PortC、SocksD、Socket正确答案： D 3下列哪一组协议属于应用层协议？ A、ICMP，RARP，ARPB、FTP,SMIP，TELNETC、ARP，IP,UDPD、IP,TCP,UDP正确答案： B 4在互联网WEB应用中以下哪一项扮演了控制角色? A、HTML语言B、Web客户端C、HTTP协议D、Web服务器正确答案: C 5下面哪一个特征是HTTP协议所不具备的: A、面向对象B、客服机/服务器C、无连接D、无状态正确答案： C 6IE8。0浏览器默认使用的超文本传输协议是哪一个版本? A、WEB 2。0B、HTTP1.0C、HTTP 1.1D、HTTP 2。0正确答案： C 7在HTTP协议中，每一个对象的地址都可以标识为： A、UDPB、UMLC、UTPD、URL正确答案: D 8HTTP需要浏览器在每一个请求中递交认证信息，这是因为HTTP协议的哪一个特性？ A、面向连接B、无连接C、分布式D、无状态正确答案: D 9在互联网WEB应用中连接由以下哪一方发起？A、HTML语言B、Web客户端C、HTTP协议D、Web服务器正确答案： B10Processes running in different hosts communicate with an : A、slotted ALOHA protocolB、Internet routing protocolC、applicationlayer protocolD、interprocess communication正确答案： C1What is the default persistent model in HTTP/1。1: A、Nonpersistent with pipeliningB、Persistent with pipeliningC、Persistent without pipeliningD、Nonpersistent HTTP正确答案： B 2Which version of hypertext transfer protocol are used in default mode now? A、WEB 2.0B、HTTP1.0C、HTTP 1.1D、HTTP 0。9正确答案： C 3The Http server works on which port： A、TCP port above 65535B、UDP 80C、TCP port above 1024D、TCP 80正确答案： D 4HTTP messages (application-layer protocol messages） exchanged between browser （HTTP client) and Web server （HTTP server） with: A、IGMPB、ICMPC、UDPD、TCP正确答案： D 5The Http client works on which port: A、TCP port above 65535B、UDP 80C、TCP port above 1024D、TCP 80正确答案: C 6To indicates end of message in Http, we can use： A、/bodyB、/htmlC、lnlf。lnlfD、lnlf正确答案： D 7Which connections can be used by HTTP/1。1 in default mode? A、p2p connectionsB、udp connectionsC、non-persistent connectionsD、persistent connections正确答案： D8WWW servers organize information into: A、WEB pagesB、Relational DatabaseC、Distributed hypertext hypermediaD、Yellow pages正确答案： A 9Http server maintains no information about past client requests, Protocols that maintain “state” are：A、SimpleB、ComplexC、SecurityD、Easy正确答案: B 10If you are downloading a web page with multiple objects in it, which of the following is the most efficient way？ A、None persistent HTTPB、Persistent HTTP with pipelineC、Persistent HTTP without pipelineD、None of the above正确答案： B 1What is not communication services provided to apps in network :A、connectionlessB、connectionorientedC、objectorientedD、Transmission Control Protocol正确答案： C 2How is data transferred through net，what is wrong？A、statistical multiplexingB、disk to disk copyC、packetswitchingD、circuit switching正确答案: B 3In which network， propagation delay maybe greater then queuing delay:A、Fiber NetworkB、Wire LANC、Satellite Network D、WIFI Network正确答案: C4Which is not a network communication links？A、FiberB、CopperC、SubwayD、Radio正确答案： C 5Packet-switched networks goal is moving packets through routers from source to destination via:A、forwardB、storeC、dropD、replay正确答案： A 6Which Physical Media has low error rate?A、Twisted PairB、Coaxial cableC、Fiber optic cableD、radio正确答案： C 7Todays Internet not useA、TCP/IPB、statistical multiplexingC、Circuit switchingD、Packet-switchi正确答案： C 8which is not Cerf and Kahns internetworking principles ?A、minimalism， autonomyB、best effort service modelC、stateless routersD、centralized control正确答案: D 9包交换中丢失的包去哪了？A、缓存在路由器B、在传输媒体上飞C、在上一个路由器D、彻底消失了正确答案： D 10包交换中丢失的包会阻塞网络吗?A、会B、不会C、不确定D、真不知道正确答案： B 1The Status code for request succeeded and requested object later in this message is：A、301 Moved PermanentlyB、200 OKC、400 Bad RequestD、404 Not Found正确答案： B2Which is wrong in the following statement about Clientserver archicture:A、clients communicate with serverB、clients may have dynamic IP addressesC、clients is always-on hostD、clients do not communicate directly with each other正确答案： C 3HTTP response status codes of requested document not found on server， is ： A、404B、500C、400D、304正确答案： A 4Which mothed type is not provided in HTTP/1.0： A、HEADB、PUTC、POSTD、GET正确答案： B 5In the Web Client/Server work environment, who play a control role? A、HTML LanguageB、Web ClientC、HTTP ProtocolD、Web Server正确答案： C 6If every page of the site need Userserver authorization,we can use： A、Nonpersistent HTTPB、Persistent HTTPC、Conditional GET： client-side cachingD、Cookies： keeping “state正确答案： D 7Web page consists of ( ） which includes several referenced objects： A、base HTML-fileB、home HTML-fileC、host HTML-fileD、referenced HTMLfile正确答案： A 8Web server maintains no information about past client requests， so HTTP is： A、unsatisfiedB、satisfiedC、statelessD、stateful正确答案： C9Which is not based on web Caching? A、Offline BrowseB、NATC、CDNSD、PROXY正确答案： B 10In Clientserver paradigm, process sends/receives messages to/from its ： A、FirewallB、DoorC、SocketD、Slot正确答案： C 1HTTP协议的服务器端口号一般为:A、80B、110C、1024D、4096正确答案： A 2HTTP协议的客户端端口号一般为:A、80B、110C、1024D、4096正确答案: C3Http1。1中持续/流水线模式时，可以同时传多个对象吗？A、不可以B、可以C、不知道D、不确定正确答案: 4Http1。1中持续/流水线模式时,可以同时在一个socket中传输多个对象吗？A、不可以B、可以C、不知道D、不确定正确答案： A 5安全性更好的HTTP协议标准是什么？A、HTTP2。0B、HTTPSC、HTML5D、FLASH正确答案: B 6互联网上哪个应用不属于WEB2.0?A、SMSB、SNSC、BLOGD、FACEBOOK正确答案： A7Proxy服务器在实现上主要是利用了什么方法?A、条件更新B、条件请求C、动态DNSD、动态IP正确答案： B 8一个HTTP报文的大小可能是多大？A、小于1480字节B、小于64K字节C、大于64K字节D、理论上无限制正确答案： D 9IE8浏览器下允许并发的连接数可能是多少？A、1B、2C、4D、8正确答案： C 10下述哪个方法不能向服务器递交信息？A、headB、getC、putD、post正确答案： A 1If you want to find the server of WWW.NBU。EDU。CN,select the DNS search type? A、Type=CNameB、Type=NSC、Type=MXD、Type=A正确答案： D2Which type of DNS query can return name value of mail server associated with domain name? A、type=NSB、type=CNAMEC、type=MXD、type=A正确答案: C3If you want to build a Content Distribution Networks，You can the DNS search type for alias： A、Type=CNameB、Type=MXC、Type=NSD、Type=A正确答案： A 4If you want to find the auhoritative name server of domain NBU.EDU.CN，select the DNS search type? A、Type=CNameB、Type=NSC、Type=MXD、Type=A正确答案： B 5In client host, we need to config IP with： A、Root domain serversB、Toplevel domain serversC、Authoritative DNS serversD、Local Name Server正确答案: D 6Which domain name is wrong? A、cs。un.nlB、cs.keio。ac。jpC、eng。sun。comD、/com/sun/eng正确答案: D 7In DNS，“I dont know this name， but ask this server means： A、authoritative name serverB、recursive queryC、Local name serverD、iterated query正确答案: D 8There is identification in DNS messages，which is a 16 bit number for query and reply to query uses ：A、same numberB、number+1C、number+8D、number+16正确答案: A 9Which is not the reason for decentralize DNS?A、single point of failureB、traffic volumeC、distant centralized databaseD、copy right正确答案： D 10Which is wrong for DNS： A、query and reply messages, both with same message formatB、distributed db storing resource records (RR)C、When a host makes a DNS query， query is sent to its Root DNS serverD、distributed database implemented in hierarchy of many name servers正确答案： C 1When ftp server receives file command, which opens the 2nd TCP connection for file tranfer： A、server or clientB、server and clientC、clientD、server正确答案： A 2Ftp Client obtains authorization over control connection on port：A、20B、21C、25D、110正确答案： B 3Which APP protocol use separate control and data connections on to port： A、Email 110 and 25B、Ftp 21 and 20C、Http 80 and 808D、Telnet 25 and 1025正确答案： B 4FTP client browses remote directory by sending commands over: A、IP connectionB、UDP connectionC、data connectionD、control connection正确答案: D 5Which application is usually based on UDP and TCP protocol？ A、Network GamesB、FTP DownloadC、Sending E-mailD、Web Browsing正确答案： A6在下面列出的TCP/IP命令中，哪一个可以被用来远程登录主机？ A、telnetB、ftpC、loginD、tftp正确答案： A 7In which, FTP data connect can initiation from port 20 on server to hight port on client？A、Passive FTPB、Active FTPC、SFTPD、TFTP正确答案： B8In which, FTP data connect can initiation from high port on client to high port on server？A、Active FTPB、Passive FTPC、SFTPD、TFTP正确答案: B 9Which is not a sample commands that sent as ASCII text over control channel in FTP?A、USERB、PASSC、LISTD、HEAD正确答案： D 10Which is not a Sample return codes in FTP?A、304B、331C、125D、425正确答案： A 1If you want to find the mail server of domain NBU。EDU.CN，select the DNS search type？ A、Type=MAILB、Type=NSC、Type=MXD、Type=A正确答案： C 2Which is wrong for SMTP:A、SMTP use two separated connections for outgoing mailsB、SMTP server uses CRLF。CRLF to determine end of messageC、SMTP requires message (header & body) to be in 7-bit ASCIID、SMTP uses persistent connections正确答案: A3Which is not a email application protocol?A、SMNPB、SMTPC、IMAPD、POP3正确答案： A 4In MIME， Msword is one subtypes of Content-Type：A、TextB、ApplicationC、ImageD、Doc正确答案: B 5In email protocol， which will not be used?A、MINEB、QP（Quote-Printable)C、Base64D、CDNS正确答案： D6For send email via SMTP, it requires message （header & body) to be in:A、octet-streamB、8bit ASCIIC、7-bit ASCIID、Ziped正确答案: C7Which one is a right email address? A、wang163。comB、wang102&C、wang。cnD、Wang正确答案： D 8Which element are not in Mail Servers：A、Mailbox contains incoming messages for userB、Message queue of outgoing (to be sent） mail messagesC、SMTP protocol between mail servers to send email messagesD、NAT device for outgoing mails正确答案： D9Which is not a major components？A、user agentsB、mail serversC、simple mail transferD、gmail正确答案： D10SMTP uses TCP to reliably transfer email message from client to server with port：A、21B、25C、75D、110正确答案： B 1In P2P file sharing， which is easy to shut down by law: A、Query floodingB、decentralized directoryC、centralized directoryD、pure Clinet/Server正确答案： C 2In P2P file sharing， in which the group leaders can get overloaded： A、centralized directoryB、Query floodingC、decentralized directoryD、Pure Clinet/Server正确答案: C 3C/S， P2P and _ are three types of application architectures. A、B/SB、Hybrid of C/S and P2PC、User to userD、Command and Conquer正确答案: B 4Which is not a network end system architecture model： A、Client/ServerB、Peer-PeerC、EndEndD、Hybrid Client/Server and Peer-Peer正确答案： C5The problems with centralized directory of P2P not include： A、Copyright infringementB、Performance bottleneckC、Bootstrap node neededD、Single point of failure正确答案： C 6The problems with decentralized directory of P2P maybe: A、Copyright infringementB、Performance bottleneckC、Bootstrap node neededD、Single point of failure正确答案: C 7In centralized directory of P2P， the disadvantages of approach maybe:A、complex protocolB、bootstrap node neededC、single point of failureD、group leaders can get overloaded正确答案: C 8Query flooding is fully distributed，it means:A、no distributed serverB、no central serverC、no IP neededD、no water正确答案: B 9Which one is wrong in P2P decentralized directory?A、Each peer is either a group leader or assigned to a group leaderB、Group leader tracks the content in all its childrenC、Peer queries other peersD、Group leader may query other group leaders正确答案： C 10which one is wrong in P2P with centralized directory？A、peer is decentralized，B、file transfer is decentralizedC、locating content is highly centralizedD、locating content is highly decentralized正确答案： D 1邮件发送方显示邮件已经发送成功，可是有的时候接受方却没有接受到邮件，那是因为显示的仅仅为客户端发送到自己的SMTP服务器成功了.正确答案： 2邮件传输过程可以省略中间服务器的转发，可否直接传输到对方的邮件服务器。正确答案： 3书上说http方式是一个请求、一个封装、一个对象进行传送的,而我们平时通过浏览器发邮件时可以同时发送多个附件，这是矛盾的。正确答案： 4EMAIL传输文件时,可以区分文件类型，文本文件使用TCP/IP协议传输，视频文件使用UDP协议传输，这样传输速度会更快。正确答案: 5有时在QQ邮箱发送邮件,会挺久后才显示在发送中,可是文件本身并不大呀，这是因为邮件服务器的排队发送的队列可能比较长。正确答案： 6邮件服务器之间的邮件传送使用SMTP协议,客户端往邮件服务器发送邮件采用POP3协议。正确答案： 7SMTP要求必须在提供了账户名和密码之后才可以登录 SMTP 服务器，这就可以彻底防止那些垃圾邮件。正确答案: 8IMAP协议可以阅读邮件，但是不可以发送邮件，邮件客户端发送邮件必须用SMTP.正确答案： 9Base64的编码方式不能解决繁体汉字的邮件处理.正确答案: 1In communication links， transmission rate means:A、BandwidthB、propagation speedC、process speedD、router delays正确答案： A2When congest occur in network， which delay become large？A、propagation delayB、queuing delayC、transmission delayD、processing delay正确答案： B 3应用层中的数据块常被称为:A、比特流B、帧C、分组D、消息正确答案： D 4If you are downloading a web page with multiple objects in it， which of the following is the most efficient way？ A、None persistent HTTPB、Persistent HTTP with pipelineC、Persistent HTTP without pipelineD、None of the above正确答案： B 5Which one is wrong in P2P decentralized directory?A、Each peer is either a group leader or assigned to a group leaderB、Group leader tracks the content in all its childrenC、Peer queries other peersD、Group leader may query other group leaders正确答案： C 6In client host, we need to config IP with: A、Root domain （TLD） serversB、Toplevel domain (TLD) serversC、Authoritative DNS serversD、Local Name Server正确答案： D 7What is the default persistent model in HTTP/1.1: A、Nonpersistent with pipeliningB、Persistent with pipeliningC、Persistent without pipeliningD、Nonpersistent HTTP正确答案： B 8Which domain name is wrong？ A、cs。un.nlB、cs.keio。ac。jpC、eng.sun。comD、/com/sun/eng正确答案： D 9IE8浏览器下允许并发的连接数可能是多少？A、1B、2C