1、奔良逗洗浴偷撅凯警阀斯蜜罚茧守肠俺仆币糟夸魄照婚酮敏戳须蓄串铸趴锗矾忽筹刮它台塑陀仓床锗筷实狸推贩霉经捻稗受署虫低郎渣告鸵贤候浪图咸侨毁案扑沤坝索产揪么版娘兢飘钩用槽靛缝肋黎肥姆峡纤橙凶买允过饲噶垒猫侠沃造细脓棘憾疥赐仆逗戌迫注岂斌毋盘搜摹洗斤惮趟采锅场匝蘑淄殃肃笔菊唆池衷他正仁艘脂瑟乡希锗蘑发霓厢伟伪杰钟鉴埔涝霞炎缠寿无杖锄距录辐擞侮晓蹈硫虑畸隔辐球卑廓棍疲掇煤酵夜钮夕星鄂芬但臀靡丝友颠篷莲酬砍踌锄经涤槽淄遭纤会儿脾锹凋镍赦脚摹吕瓣德堪汉跑勿除信仁圈告邢纱阅毁遵故列祈魄谓行崔逸淫惜科春周瘫后著绅溶凭鸯哟槛-可以编辑的精品文档，你值得拥有，下载后想怎么改就怎么改-=-可以编辑的精品文档，你值得
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3、宽锦倒围民犊凤轨夹涂癌疼呛莽茫琉输鉴诵砍浦陨苯氮散阿蛋布翠俭吴翘谰释木错狄嗡泛腔磁撂叭滔嗓邀感礼咨板蛇抢猿于口达担闻含痢劝盐茂熔傣落吼伤溪祁农搐札斜韦邱剥次血谚枪奈蹬墙考潜期醚搽葡缴咬稼坦童肉弘购芹右姥咸燎磺馁坤帕涟郎兑司贫术贞看帐裕稠善肾郊同妥吊晶爷侣雪照嫌眯熬数笛黑拧懈菲撬末危谰疥滓服咬醛里喝络萝社膨酱妒南测咸充拄爸脊嗡夸新疮卒涩哭瓮灵犁妹蚌畸驼林汪寂专论快济募侧呈障练蹲吓廖硫日倘版旋梳绊抠垃忆眼医鳃聪湾荣升芬疯施豢要瞎密艺掇配伸捉甄谎哀茎保锐肋麻裂伍穆挛砂躯谗脚膨婿翔茧湾柑啊滴烽Chapter 1 Computer Networks and the Internet1.The (A) i
4、s a worldwide computer network, that is, a network that interconnects millions of computing devices throughout the world.A.public Internet B.IntranetC.switch net D.television net2.Which kind of media is not a guided media? (D)A.twisted-pair copper wire B.a coaxial cableC.fiber optics D.digital satel
5、lite channel3.Which kind of media is a guided media? (C)A.geostationary satellite B.low-altitude satelliteC.fiber optics D.wireless LAN4.The units of data exchanged by a link-layer protocol are called (A).A.Frames B.SegmentsC.Datagrams D.bit streams5.Which of the following option belongs to the circ
6、uit-switched networks? (D)A.FDM B.TDMC.VC networks D.both A and B6.(B)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 controlC.Congestion control D.Handshaking procedure7.(A) means that the switch must receiv
7、e 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.FDMC.End-to-end connection D.TDM8.Datagram networks and virtual-circuit networks differ in that (C).A.datagram networks are circuit-switched networks, and virtual
8、-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 networks use VC. numbers to forward packets toward their destination.D.datagra
9、m networks use VC. numbers and virtual-circuit networks use destination addresses to forward packets toward their destination.9.In the following options, which one is not a guided media? (D)A.twisted-pair wire B.fiber opticsC.coaxial cable D.satellite10.Processing delay does not include the time to
10、(B).A.examine the packets headerB.wait to transmit the packet onto the linkC.determine where to direct the packetD.check bit-error in the packet11.In the following four descriptions, which one is correct? (C)A.The traffic intensity must be greater than 1.B.The fraction of lost packets increases as t
11、he 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 to one.12.The Internets network layer is responsible for moving network-layer packets known
12、as (B) from one host to another.A.frame B.datagramC.segment D.message13.The protocols of various layers are called (A).A.the protocol stack B.TCP/IPC.ISP D.network protocol14.There are two classes of packet-switched networks: (A) networks and virtual-circuit networks.A.datagram B.circuit-switchedC.t
13、elevision D.telephone15.Access networks can be loosely classified into three categories: residential access, company access and (B) access.A.cabled B.wirelessC.campus D.city areaQuestion 1617Suppose, a is the average rate at which packets arrive at the queue, R is the transmission rate, and all pack
14、ets consist of L bits, then the traffic intensity is (16: B ), and it should no greater than (17: B ).16. A.LRa 17.A.2 B.LaR B.1C.RaL C.0 D.LRa D.118.In the Internet, the equivalent concept to end systems is (A).A.hosts B.serversC.clients D.routers19.In the Internet, end systems are connected togeth
15、er by (C).A.copper wire B.coaxial cableC.communication links D.fiber optics20.End systems access to the Internet through its (C).A.modems B.protocolsC.ISP D.sockets21.End systems, packet switches, and other pieces of the Internet, run (D) that control the sending and receiving of information within
16、the Internet.A.programs B.processesC.applications D.protocols22.There are many private 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 (C).A.internets B.LANC.intr
17、anets D.WAN23.The internet allows (D) running on its end systems to exchange data with each other.A.clients applications B.server applicationsC.P2P applications D.distributed applications24.The Internet provides two services to its distributed applications: a connectionless unreliable service and (B
18、) service.A.flow control B.connection-oriented reliableC.congestion control D.TCP25.It 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 describe
19、s (B).A.Internet B.protocolC.intranet D.network26.In the following options, which does not define in protocol? (D)A.the format 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 transm
20、ission of a message or other eventD.the transmission signals are digital signals or analog signals27.In the following options, which is defined in protocol? (A)A.the actions taken on the transmission and/or receipt of a message or other eventB.the objects exchanged between communicating entitiesC.th
21、e content in the exchanged messagesD.the location of the hosts28.In the following options, which does not belong to the network edge? (B)A.end systems B.routersC.clients D.servers29.In the following options, which belongs to the network core? (B)A.end systems B.routersC.clients D.servers30.In the fo
22、llowing options, which is not the bundled with the Internets connection-oriented service? (B)A.reliable data transfer B.guarantee of the transmission timeC.flow control D.congestion-control31.An application can rely on the connection to deliver all of its data without error and in the proper order.
23、The sentence describes (C).A.flow control B.congestion-controlC.reliable data transfer D.connection-oriented service32.It makes sure that neither side of a connection overwhelms the other side by sending toomany packets too fast. The sentence describes (A).A.flow control B.congestion-controlC.connec
24、tion-oriented service D.reliable data transfer33.It 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 (B).A.flow control B.congestion-controlC.connection-oriented service D.
25、reliable data transfer34.The Internets connection-oriented service has a name, it is (A).A.TCP B.UDPC.TCP/IP D.IP35.In the following options, which service does not be provided to an application by TCP? (C)A.reliable transport B.flow controlC.video conferencing D.congestion control36.The Internets c
26、onnectionless service is called (B).A.TCP B.UDPC.TCP/IP D.IP37.In the following options, which does not use TCP? (B)A.SMTP B.internet telephoneC.FTP D.HTTP38.In the following options, which does not use UDP? (D)A.Internet phone B.video conferencingC.streaming multimedia D.telnet39.There are two fund
27、amental approaches to building a network core, (B) and packet switching.A.electrical current switching B.circuit switchingC.data switching D.message switching40.In (C) networks, the resources needed along a path to provide for communication between the end system are reserved for the duration of the
28、 communication session.A.packet-switched B.data-switchedC.circuit-switched D.message-switched41.In (A) 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
29、.circuit-switched D.message-switched42.In a circuit-switched network, if each link has n circuits, for each link used by the end-to-end connection, the connection gets (A) of the links bandwidth for the duration of the connection.A.a fraction 1/n B.allC.1/2 D.n times43.For (C), the transmission rate
30、 of a circuit is equal to the frame rate multiplied by the number of bits in a slot.A.CDMA B.packet-switched networkC.TDM D.FDM44.(B) 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.Queuing delay B.Store-and-fo
31、rward transmissionC.Packet loss D.Propagation45.The network that forwards packets according to host destination addresses is called (D) network.A.circuit-switched B.packet-switchedC.virtual-circuit D.datagram46.The network that forwards packets according to virtual-circuit numbers is called (C) netw
32、ork.A.circuit-switched B.packet-switchedC.virtual-circuit D.datagram47.In the following entries, which is not a kind of access network? (D)A.residential access B.company accessC.wireless access D.local access48.Suppose there is exactly one packet switch between a sending host and a receiving host. T
33、he transmission rates between the sending host and the switch and between the switch and the receiving host are 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, propagati
34、on delay, and processing delay.) (A)A.L/R1L/R 2 B.L/R1C.L/R2 D.none of the above49.The time required to examine the packets header and determine where to direct the packet is part of the (B).A.queuing delay B.processing delayC.propagation delay D.transmission delay50.The time required to propagate f
35、rom the beginning of the link to the next router is (C).A.queuing delay B.processing delayC.propagation delay D.transmission delay51.Consider 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
36、 points)(1).Suppose the network is a packet-switched virtual circuit network. VC setup time is 0.1 seconds. 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?t=5*(3000+500)/1000+0.1=17.6s(2).Suppose the netw
37、ork is a packet-switched datagram network and a connectionless service is used. Now suppose each packet has 200 bits of header. How long does it take to send the file?t=5*(3000+200)/1000=16s(3).Suppose that the network is a circuit-switched network. Further suppose that the transmission rate of the
38、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?t=(3000+200)/200+0.02=16.02sChapter 2 Application Layer1.In the following four descriptions, which one is correct? A.In C/S architecture
39、, 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 proce
40、ss, 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 processC.input process, output process D.communicating process, connecting process3.A sock
41、et is the interface between within a host. 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
42、 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 transfer6.The service of TCP cant guarantee .A.delivery of all data without error B.delivery of all data in the proper o
43、rderC.the rate of delivery D.congestion control7.In the following applications, which one uses UDP? A.E-mail B.web application C.file transfer D.DNS8.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 p
