天津理工大学计算机网络期末考试复习提纲带答案

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第1页共2页单选题/填空题:1.CIDRaddress无类域间路由地址(P227-229)2.UDP用户数据报协议(P132-135)3.TCPretransmissionTCP重传(P163-167,3.5.4)4.IPaddressheaderlengthIP地址首部长度(40bytes)5.IPheaderfieldIP地址首部(P221-225)6.networkedgeandnetworkcore网络边缘与网络核心(P6-22,1.3-1.4)7.transmissiondelay传输时延:d/s8.applicationprotocols(underlyingtransportprotocols)基于运输层的应用层协议(TCP、UDP)9.transportprotocolsandportnumbersofsomeapplicationprotocols运输层协议、应用层协议及端口号10.TCPsegmentstructureandUDPsegmentstructureTCP(P157-158)、UDP报文结构(P135,3.3.1)11.IPv6addressIPV6地址(P238-242)12.MACaddressMAC地址(P307-308)13.Ping14.Trafficintensity流量强度(P28)15.HTTPstatuscodeHTTP状态码(P71)简答题:1.Thetwokeyfunctionofnetworklayer(routingandforwarding)网络层两个核心功能(转发与选路)forwarding:movepacketsfromrouter’sinputtoappropriaterouteroutput.routing:determineroutetakenbypacketsfromsourcetodest.2.ThelayersofaDNSserverDNS服务器分层结构rootnameserver、top-leveldomain(TLD)server、authoritativeDNSserver、LocalDNSnameserver3.RoutingtoanotherLANbyknowingIPaddress(ARP,Ethernetwork)(P309-314)已知IP地址,选路到另一个局域网掌握ARP工作原理,掌握在同一子网中ARP是如何工作的,中间经过路由器是如何工作的。4.pipelinedprotocolandstop-and-waitprotocol流水线协议与停等协议(P138-147)掌握RDT2.0、3.0和流水线的工作方式以及效率。5.OSIarchitectureOSI参考模型有哪几层?每层的功能是什么?application:supportingnetworkapplicationspresentation:allowapplicationstointerpretmeaningofdatasession:synchronization,checkpointing,recoveryofdataexchangetransport:process-processdatatransfernetwork:routingofdatagramsfromsourcetodestinationlink:datatransferbetweenneighboringnetworkelementsphysical:bits“onthewire”第2页共2页6.ThedifferencebetweenpureALOHAandCSMA纯ALOHA协议与CSMA协议的区别PureAloha:simpler,nosynchronization.Whenframefirstarrives,transmitimmediately.Butcollisionprobabilityincreases:framesentatt0collideswithotherframessentin[t0-1,t0+1]CSMA:Listenbeforetransmit:ifchannelsensedidle,transmitentireframe;ifchannelsensedbusy,defertransmission.综合题:1.TCPcongestioncontrolTCP拥塞控制(P181-186)2.Dijkstra’sshortest-pathalgorithmDijkstra最短路径算法(4.5.1P246-247)3.Protocolanalyze(howeachlayerofTCP/IPworksifweusehttporftp)协议分析,自顶向下分析HTTP/FTP工作原理(全书综合)

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