2022年2022年计算机网络题库chapter .pdf

《2022年2022年计算机网络题库chapter .pdf》由会员分享，可在线阅读，更多相关《2022年2022年计算机网络题库chapter .pdf（4页珍藏版）》请在淘文阁 - 分享文档赚钱的网站上搜索。

1、1 Chapter 1 Computer Networks and the Internet 1The ( ) is a worldwide computer network, that is, a network that interconnects millions of computing devices throughout the world. ppt3 A public Internet B Intranet C switch net D television net 2Which kind of media is not a guided media? ( ) A twisted

2、-pair copper wire B a coaxial cable C fiber optics D digital satellite channel 3Which kind of media is a guided media? ( ) A geostationary satellite B low-altitude satellite C fiber optics D wireless LAN 4The units of data exchanged by a link-layer protocol are called ( ). A Frames B Segments C Data

3、grams D bit streams 5Which of the following option belongs to the circuit-switched networks? ( ) A FDM B TDM C VC networks D both A and B 6( )makes sure that neither side of a connection overwhelms the other side by sending too many packets too fast. A Reliable data transfer B Flow control C Congest

4、ion control D Handshaking procedure 7( ) means 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 Store-and-forward transmission B FDM C End-to-end connection D TDM 8Datagram networks and virtual-circuit networks diffe

5、r in that ( ). A datagram networks are circuit-switched networks, and virtual-circuit networks are packet-switched networks. B datagram networks are packet-switched networks, and virtual-circuit networks are circuit-switched networks. C datagram networks use destination addresses and virtual-circuit

6、 networks use VC. numbers to forward packets toward their destination. D datagram networks use VC. numbers and virtual-circuit networks use destination addresses to forward packets toward their destination. 9In the following options, which one is not a guided media? ( ) A twisted-pair wire B fiber o

7、ptics C coaxial cable D satellite 10Processing delay does not include the time to ( ). A examine the packet s header B wait to transmit the packet onto the link C determine where to direct the packet D check bit-error in the packet 11In the following four descriptions, which one is correct? ( ) A Th

8、e traffic intensity must be greater than 1. B The fraction of lost packets increases as the traffic intensity decreases. C If the traffic intensity is close to zero, the average queuing delay will be close to zero. D If the traffic intensity is close to one, the average queuing delay will be close t

9、o one. 12The Internet s network layer is responsible for moving network-layer packets known as ( ) from one host to another. A frame B datagram C segment D message 13The protocols of various layers are called ( ). A the protocol stack B TCP/IP C ISP D network protocol 14There are two classes of pack

10、et-switched networks: ( ) networks and virtual-circuit networks. A datagram B circuit-switched C television D telephone 15Access networks can be loosely classified into three categories: residential access, company access and ( ) access. A cabled B wireless C campus D city area Question 1617 名师资料总结

11、- - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 1 页，共 4 页 - - - - - - - - - 2 Suppose, a is the average rate at which packets arrive at the queue, R is the transmission rate, and all packets consist of L bits, then the traffic intensity is ( 16 ), and it should no greater th

12、an ( 17 ). 16A LRaB LaRC RaLD LRa 17A 2 B 1 C 0 D -1 18In the Internet, the equivalent concept to end systems is ( ). A hosts B servers C clients D routers 19In the Internet, end systems are connected together by ( ). A copper wire B coaxial cable C communication links D fiber optics 20End systems a

13、ccess to the Internet through its ( ). A modems B protocols C ISP D sockets 21End systems, packet switches, and other pieces of the Internet, run ( ) that control the sending and receiving of information within the Internet. A programs B processes C applications D protocols 22There are many private

14、networks, such as many corporate and government networks, whose hosts cannot exchange messages with hosts outside of the private network. These private networks are often referred to as ( ). A internets B LANC intranets D WAN 23The internet allows ( ) running on its end systems to exchange data with

15、 each other. A clients applications B server applications C P2P applications D distributed applications 24The Internet provides two services to its distributed applications: a connectionless unreliable service and () service. A flow control B connection-oriented reliable C congestion control D TCP 2

16、5It defines the format and the order 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 protocol C intranet D network 26In the following options, which

17、 does not define in protocol? ( ) A the format of messages exchanged between two or more communicating entities B the order of messages exchanged between two or more communicating entities C the actions taken on the transmission of a message or other event D the transmission signals are digital sign

18、als or analog signals 27In the following options, which is defined in protocol? ( ) A the actions taken on the transmission and/or receipt of a message or other event B the objects exchanged between communicating entities C the content in the exchanged messages D the location of the hosts 28In the f

19、ollowing options, which does not belong to the network edge? ( ) A end systems B routers C clients D servers 29In the following options, which belongs to the network core? ( ) A end systems B routers C clients D servers 30In the following options, which is not the bundled with the Internet s connect

20、ion-oriented service? ( ) A reliable data transfer B guarantee of the transmission time C flow control D congestion-control 31An 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 名师资料总结 - - -精品资料欢迎下载 -

21、- - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 2 页，共 4 页 - - - - - - - - - 3 B congestion-control C reliable data transfer D connection-oriented service 32 It makes sure that neither side of a connection overwhelms the other side by sending too many packets too fast. The sentence describes

22、 ( ). A flow control B congestion-control C connection-oriented service D reliable data transfer 33It helps prevent the Internet from entering a state of gridlock. When a packet switch becomes congested, its buffers can overflow and packet loss can occur. The sentence describes ( ). A flow control B

23、 congestion-control C connection-oriented service D reliable data transfer 34The Internet s connection-oriented service has a name, it is ( ). A TCP B UDP C TCP/IP D IP 35In the following options, which service does not be provided to an application by TCP?( ) A reliable transport B flow control C v

24、ideo conferencing D congestion control 36The Internet s connectionless service is called ( ). A TCP B UDP C TCP/IP D IP 37In the following options, which does not use TCP?( ) A SMTP B internet telephone C FTP D HTTP 38In the following options, which does not use UDP?( ) A Internet phone B video conf

25、erencing C streaming multimedia D telnet 39There are two fundamental approaches to building a network core, ( ) and packet switching. A electrical current switching B circuit switching C data switching D message switching 40In ( ) networks, the resources needed along a path to provide for communicat

26、ion between the end system are reserved for the duration of the communication session. A packet-switched B data-switched C circuit-switched D message-switched 41In ( ) networks, the resources are not reserved; a session s messages use the resources on demand, and as a consequence, may have to wait f

27、or access to communication link. A packet-switched B data-switched C circuit-switched D message-switched 42In a circuit-switched network, if each link has n circuits, for each link used by the end-to-end connection, the connection gets ( ) of the link s bandwidth for the duration of the connection.

28、A a fraction 1/nB all C 1/2 D n times 43For ( ), the transmission rate of a circuit is equal to the frame rate multiplied by the number of bits in a slot. A CDMA B packet-switched network C TDM D FDM 44( ) means that the switch must receive the entire packet before it can begin to transmit the first

29、 bit of the packet onto the outbound link. A Queuing delay B Store-and-forward transmission C Packet loss D Propagation 45The network that forwards packets according to host destination addresses is called ( ) network. A circuit-switched B packet-switched C virtual-circuit D datagram 46The network t

30、hat forwards packets according to virtual-circuit numbers is called ( ) network. A circuit-switched B packet-switched C virtual-circuit D datagram 47In the following entries, which is not a kind of access network?( ) A residential access B company access 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - -

31、- - - - - - 名师精心整理 - - - - - - - 第 3 页，共 4 页 - - - - - - - - - 4 C wireless access D local access 48Suppose there is exactly one packet switch between a sending host and a receiving host. The transmission rates between the sending host and the switch and between the switch and the receiving host are

32、 R1 and R2, respectively. Assuming that the switch uses store-and-forward packet switching, what is the total end-to-end delay to send a packet of length L? (Ignore queuing delay, propagation delay, and processing delay.) ( )A L/R1L/R2B L/R1C L/R2D none of the above 49The time required to examine th

33、e packet s header and determine where to direct the packet is part of the ( ). A queuing delay B processing delay C propagation delay D transmission delay 50 The time required to propagate from the beginning of the link to the next router is ( ). A queuing delay B processing delay C propagation dela

34、y D transmission delay 51Consider sending a packet of 3000bits over a path of 5 links. Each link transmits at 1000bps. Queuing delays, propagation delay and processing delay are negligible. (6 points) (1).Suppose the network is a packet-switched virtual circuit network. VC setup time is 0.1 seconds.

35、 Suppose the sending layers add a total of 500 bits of header to each packet. How long does it take to send the file from source to destination? (2).Suppose the network is a packet-switched datagram network and a connectionless service is used. Now suppose each packet has 200 bits of header. How lon

36、g does it take to send the file? (3).Suppose that the network is a circuit-switched network. Further suppose that the transmission rate of the circuit between source and destination is 200bps. Assuming 0.02s setup time and 200 bits of header appended to the packet, how long does it take to send the packet? 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 4 页，共 4 页 - - - - - - - - -