北京化工大学2008计算机网络试卷

附件1：北京化工大学本科生课程考核试卷格式北京化工大学2006——2007学年第二学期《计算机网络》期末考试试卷课程代码CSE3350E班级：姓名：学号：分数：题号一二总分得分一、Explainfollowingterms.1.B/SandP2P:2.VLAN:3.DataLinkLayerandTransportLayer:4.ARP:5.ManchesterEncoding:6.CclassIPaddress:7.SlottedALOHA:8.DNS:二、AnswerfollowingquestionsWhatiscomputernetwork?Pleasegivethedifferencesbetweencomputernetworksanddistributedsystem.ThereisoneBclassIPaddress186.4.130.0toassign16schoolsinoneuniversity.Thenumberofcomputersineachschoolislessthan1024.HowtosubnetthisIPaddresstotheseschools?Pleasegivesubnetmask.TwohostscommunicatebyTCP.Thesizeofsenderwindowsis5,andthesizeofreceiverwindowis5.PleasediscribeprocessingmethodbyGo-Back-NandSelective-Retransimissionprotocolsrespectivelywhensegment2doesnotgettoreciever?WhatisNAT?Pleasegivedetailedexplaination.ThehostAandhostBcoomunicateeachother.TheinitialsequencenumbersofhostAandhostBare400and500.Pleasefilloutspacesforvaluseofseqandackinfollowingfigure.HostAHostBSeq=Ack=Data=ready?Seq=Ack=Data=okSeq=Ack=Data=okPleaseexplainfollowingfigureaboutRTTandgivethedefinationofTimeOut.WhatistheCount-to-InfinityProblemofrouting?Giveexampletoexplainit.PleaseexplainfollowingfigureaboutTCPCongestioncontrol.ClientBillSmithwantstosendamessagetoaserver(198.150.11.163).Theframeswillflowfromclienttoserveroverthisover.Pleasefillspacesintheframestructure.FromClienttoRouterA:Destination(2layer)Source(2layer)Source(3layer)Destination(3layer)DataCRCEmailCRCFromRouterBtoServer:Destination(2layer)Source(2layer)Source(3layer)Destination(3layer)DataCRCEmailCRCWhatareusermode,privilegedmode,andglobalconfigurationmodewhenyouconfigureCISCOnetworkdevices?ThereisaCiscoswitch.HowtoassignVLAN1toPort1andPort2,VLAN2toPort15andport16?Pleasegivedetailedsteps.