计网实验DNS--Data-Encapsulation-and-Frame-owrksLabsDNS,DataEncapsulationandFrameExaminationDNS,pletionofthislab,youwillbeableto:mands ,,pleaseratethefollowinginthescaleof1through5:Thedegreeofdifficulty:1=tooeasy;5=toodifficultThelearningexperience:1=learnednothing;5=learnedalotYourinterest:1=nointerest;5=highinterestTimeusedforthetask:inminutesTaskDifficulty(1—5)Learning(1—5)Interest(1—5)Time(min)ment:municatewitheachother,dataatthesendinghost flowsdowntheTCP/IPprotocollayersandisencapsulatedintoaprotocoldataunitatlowerlayer,,; theUDPsegmentisthenencapsulatedinanIPpacket,,,,,,mand,,pleasereadthelectures02,04-05,10, ProtocolLayersandDataEncapsulationAswehavediscussedinLecture02,isinter-worksbasedonTCP/. Whatarenamesfortheprotocoldataunits(PDUs)forlayer4,layer3,andlayer2protocolsinTCP/IPreferencemodelbyfillingthefollowform: nameforPDUoflayer4protocols: segment nameforPDUoflayer3protocol: packet nameforPDUoflayer2protocol: frame Task1 DNSandnslookupAswediscussed,.ButIPaddressisnotuser-friendlyandthatiswhydomainnamew
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