1、1Chapter 1 Computer Networks and the Internet1The ( ) is a worldwide computer network, that is, a network that interconnects millions of computing devices throughout the world. ppt3A public Internet 公共网络 B Intranet 企业内部互联网C switch net 交换网 D television net 电视网2Which kind of media is not a guided medi
2、a(引导媒体)? ( )A twisted-pair copper wire 双绞线铜线 B a coaxial cable 同轴电缆C fiber optics 纤维光学 D digital satellite channel 数字卫星频道3Which kind of media is a guided media? ( )A geostationary satellite 地球同步卫星B low-altitude satellite 低空卫星C fiber optics 纤维光学D wireless LAN 无线局域网4The units of data exchanged by a li
3、nk-layer protocol are called ( ).A Frames B SegmentsC Datagrams D bit streams5Which of the following option belongs to the circuit-switched(电路交换) networks? ( )A FDM B TDMC VC networks D both A and B6( )makes sure that neither side of a connection overwhelms the other side by sending too many packets
4、 too fast.A Reliable data transfer B Flow controlC Congestion control D Handshaking procedure8Datagram networks and virtual-circuit networks differ in that ( ).A datagram networks are circuit-switched networks, and virtual-circuit networks are packet-switched networks.B datagram networks are packet-
5、switched networks, and virtual-circuit networks are circuit-switched networks.C datagram networks use destination addresses and virtual-circuit networks use VC. numbers to forward packets toward their destination.D datagram networks use VC. numbers and virtual-circuit networks use destination addres
6、ses to forward packets toward their destination.9In the following options, which one is not a guided media? ( )A twisted-pair wire B fiber opticsC coaxial cable D satellite10Processing delay does not include the time to ( ).A examine the packets headerB wait to transmit the packet onto the link2C de
7、termine where to direct the packetD check bit-error in the packet12The Internets network layer is responsible for moving network-layer packets known as ( ) from one host to another.A frame B datagramC segment D message13The protocols of various layers are called ( ).A the protocol stack B TCP/IPC IS
8、P D network protocol14There are two classes of packet-switched networks: ( ) networks and virtual-circuit networks.A datagram B circuit-switchedC television D telephone15Access networks can be loosely classified into three categories: residential access, company access and ( ) access.A cabled B wire
9、lessC campus D city area18In the Internet, the equivalent concept to end systems is ( ).A hosts B serversC clients D routers19In the Internet, end systems are connected together by ( ).A copper wire B coaxial cableC communication links 通信链路 D fiber optics20End systems access to the Internet through
10、its ( ).A modems B protocolsC ISP 网络运营商 D sockets21End systems, packet switches, and other pieces of the Internet, run ( ) that control the sending and receiving of information within the Internet.A programs B processesC applications D protocols22There are many private networks, such as many corpora
11、te and government networks, whose hosts cannot 3exchange messages with hosts outside of the private network. These private networks are often referred to as ( ).A internets B LANC intranets D WAN23The internet allows ( ) running on its end systems to exchange data with each other.A clients applicati
12、ons B server applicationsC P2P applications D distributed applications24The Internet provides two services to its distributed applications: a connectionless unreliable service and () service.A flow control B connection-oriented reliableC congestion control D TCP25It defines the format and the order
13、of messages exchanged between two or more communicating entities, as well as the actions taken on the transmission and/or receipt of a message or other event. The sentence describes ( ).A Internet B protocolC intranet D network26In the following options, which does not define in protocol? ( )A the f
14、ormat of messages exchanged between two or more communicating entitiesB the order of messages exchanged between two or more communicating entitiesC the actions taken on the transmission of a message or other eventD the transmission signals are digital signals or analog（模拟） signals27In the following
15、options, which is defined in protocol? ( )A the actions taken on the transmission and/or receipt of a message or other eventB the objects exchanged between communicating entitiesC the content in the exchanged messagesD the location of the hosts28In the following options, which does not belong to the
16、 network edge? ( )A end systems B routersC clients D servers29In the following options, which belongs to the network core? ( )A end systems B routersC clients D servers30In the following options, which is not the bundled with the Internets connection-oriented service? (在下面选择，哪一个不是捆绑了互联网的面向连接的服务？ )A
17、reliable data transfer B guarantee of the transmission timeC flow control D congestion-control431An application can rely on the connection to deliver all of its data without error and in the proper order. The sentence describes ( ).A flow control B congestion-controlC reliable data transfer D connec
18、tion-oriented service32It makes sure that neither side of a connection overwhelms the other side by sending too many packets too fast. The sentence describes ( ).A flow control B congestion-controlC connection-oriented service D reliable data transfer33It helps prevent the Internet from entering a s
19、tate of gridlock. When a packet switch becomes congested, its buffers can overflow and packet loss can occur. The sentence describes ( ).A flow control B congestion-controlC connection-oriented service D reliable data transfer34The Internets connection-oriented service has a name, it is ( ).A TCP B
20、UDPC TCP/IP D IP35In the following options, which service does not be provided to an application by TCP?( )A reliable transport B flow controlC video conferencing 视频会议D congestion control36The Internets connectionless service is called ( ).A TCP B UDPC TCP/IP D IP37In the following options, which do
21、es not use TCP?( )A SMTP B internet telephoneC FTP D HTTP38In the following options, which does not use UDP?( )A Internet phone B video conferencingC streaming multimedia D telnet39There are two fundamental approaches to building a network core(有 2 个基本方法建立一个网络核心) ， （）and packet switching.A electrica
22、l current switching 5B circuit switchingC data switching D message switching40In ( ) networks, the resources needed along a path to provide for communication between the end system are reserved for the duration of the communication session.A packet-switched B data-switchedC circuit-switched D messag
23、e-switched41In ( ) networks, the resources are not reserved; a sessions messages use the resources on demand, and as a consequence, may have to wait for access to communication link.A packet-switched B data-switchedC circuit-switched D message-switched 44( )（是指交换机必须接收整个数据包之前就可以开始传递的第一位的数据包上出站链接。 ） m
24、eans that the switch must receive the entire packet before it can begin to transmit the first bit of the packet onto the outbound link.A Queuing delay B Store-and-forward transmission 存储转发传输C Packet loss D Propagation45The network that forwards packets according to host destination addresses is call
25、ed ( ) network.A circuit-switched B packet-switchedC virtual-circuit D datagram46The network that forwards packets according to virtual-circuit numbers is called ( ) network.A circuit-switched B packet-switchedC virtual-circuit D datagram47In the following entries, which is not a kind of access netw
26、ork?( )A residential access B company accessC wireless access D local access49The time required to examine the packets header and determine where to direct the packet is part of the ( ).A queuing delay B processing delayC propagation delay D transmission delay50The time required to propagate from th
27、e beginning of the link to the next router is ( ).A queuing delay B processing delayC propagation delay 传播延迟6D transmission delayChapter 2 Application Layer1. In the following four descriptions, which one is correct? A In C/S architecture, clients communicate with each other directly.B In C/S archit
28、ecture, client has a fixed well-known address.C In P2P architecture, peers communicate with each other directly. 在对等网络结构中，同行相互直接联系。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 communi
29、cation 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 processC input process, output process D communicating process, connecting process3. A socket is the interface between within a host
30、. A the network layer and the link layerB the link layer and the physical layerC the application layer and the transport layerD the transport layer and the network layer4. In the following applications, which one is a loss-tolerant application? A E-mail B file transfer C instant messaging D real-tim
31、e audio5. In the following applications, which one is a bandwidth-sensitive application? A E-mail B web application C real-time audio D file transfer6. The service of TCP cant guarantee .A delivery of all data without error B delivery of all data in the proper orderC the rate of delivery D congestio
32、n control7. In the following applications, which one uses UDP （User Datagram Protocol 用户数据报协议）? A E-mail B web application C file transfer D DNS Domain Name Server,域名服务器8. In the following descriptions about HTTP（Hypertext Transfer Protocol）, which one is not correct? A HTTP uses non-persistent conn
33、ections in its default mode. 超文本传输协议使用非持久连接的默认模式。B HTTP uses TCP as its underlying transport protocol. 超文本传输协议使用协议作为底层传输协议C HTTP is a stateless protocol. 是一种无状态协议D HTTP is client-server architecture.10. In HTTP response message, if the requested HTTP protocol version is not supported, the status cod
34、e is .A 200 B 301 C 400 D 50511. The port number of web application is .A 25 B 20 C 80 D 5312. 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（代理服务器） D edge server13. In the following descriptions about persistent co
35、nnection 持久连接, 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
36、persistent connection with pipelining.14. FTP（File Transfer Protocol 文件传送输协议） uses two parallel TCP connections to transfer a file, there 7are .A control connection and data connectionB receiving connection and sending connectionC client connection and sever connectionD program connection and proces
37、s connection15. In the following descriptions about FTP, which one is correct?A FTP is p2p architecture. B FTP sends its control information out-of-band. 服务器发送的控制信息带C FTP uses persistent connection. D FTP is a stateless protocol. 17. The Internet mail system has three components which they are .A us
38、er agent, SMTP, POP3 B SMTP, POP3, IMAPInternet Message Access Protocol 消息访问协议C user agent, SMTP, IMAP D user agent, SMTP（Simple Message Transfer Protocol 简单邮件传输协议）, mail server18. If the status code in HTTP response message is 404, it means .A Request succeeded. B The requested document doesnt exit
39、 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
40、 persistent connection.C HTTP places all of the messages 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 doesnt impose this restriction.21. In the following protocol, which one is stateless? A POP3 和 HTTP B SMTP C FT
41、P D IMAP22. DNS means .A Data Name System B Data National SystemC Domain Name System 域名服务器 D Domain National System23. There are three classes of DNS server except .A Root DNS server B Local DNS serverC TLD server D Authoritative DNS server24. DNS provides some services except .A Host aliasing B Mai
42、l server aliasingC Load distribution D A single point of failure28. 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 timeC round-trip time 往返时间 D prefix-matching time29. Suppose A ( with a Web-based e-mail account ) s
43、ends 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 IMAP D FTP31. In FTP commands, is used to send user password
44、 to the server.A User B Pass C Retr D Stor32. The function of the additional header field in MIME 多用途的网际邮件扩充协议 Content-Type is .A to convert the message body to its origin non-ASCII formB to determine what actions it should take on message body8C to send an E-mail to the receiving user agentD to ind
45、icate what type the message is33. In the four following options, which application is organized as hybrid of C/S and P2P peer-to-peer architecture? A E-mail B OICQ C File transfer D Web application35. In the following options, from the application developers perspective, which is not correct? A the
46、network architecture is fixedB the network architecture provides a specific set of services to applicationsC the application architecture is designed by the physical devices 设备；装置D the application architecture dictates how the application is organized over the various end systems36. There are three predominant 主要的，占主导地位的 architectures used in modern network applications, which one is not included? A the client-server architecture B the P2P archit
