computer network review guide

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1、ComputernetworkReviewGuideVersion1.0OnenightinComputerNetworkByXiaomuLiuPreface:WelcometoOnenightinComputerNetwork!ItisanopensourcereviewmaterialsprovidedbyXiaomuLiu,amemberofthefamousopensourcecommitteeLUPA.Youarefreetomodify,transmitormakeanychangesyoul

2、iketothisdocument.It’scompletelyfree!Thankyouforyourappreciation,supportandtolerance.Itwillbemygreathonorifyoulikethisdocumentanditreallyhelpsinyourreview.Mayyougoodluckintheexam!Ifyouhaveanyproblemorsuggestionsforthisdocument,don’thesitatetocontactme,MyE

3、-mailisliuyimustar@126.com.XiaomuLiuDecember27th20091.WhatistheInternet?Answer:TheInternetisanetworkofnetworks.Thesenetworksconnecttogetherinmanywaystomakewhatweknowastheinternet.Thenameinternetcomesfrominterconnectednetworks.2.WhatisaPointofpresence?Answ

4、er：PointofPresence(PoP)isanaccesspointtotheinternet;itisasitewhereatelecommunicationscompanyhastheirequipment.Theequipmentisusually,modems,leasedlinesandrouters.AnInternetServiceProvider(ISP)usuallyhasmanyPoPsintheirareatomakesurethattheirusershavealocalc

5、onnection.3.What’saNAP?Answer:NAPisNetworkAccessPoint;itistheconnectionbetweenanISPandtheinternet.4.What’saninternetbackbone?Answer:Abackboneiswhenacompanyusesequipmenttogetafastconnectiontotheinternet.Thisusuallymeanslayingdownhugecablesthathavealotofban

6、dwidth.(Next,Figure1willyougiveageneralideaoftheconceptswementionhere!)(Figure-1POP,NAP,BackboneandInternet)5.Whatisarouter?1/12Goodsoftwareopensource,GoodpersonopenmindsComputernetworkReviewGuideVersion1.0Answer:Routerisadevicethatforwardsdatapacketsbetw

7、eencomputernetworks(Figure-2Router)6.What’saDNS?Answer:DomainNameSystem(DNS),whichmapstextnamestoIPaddressesautomatically.DNSserversacceptrequestsfromprogramsandothernameserverstoconvertdomainnamesintoIPaddresses.7.What’sanIPaddress?(Needcheck)Answer:IPad

8、dressworksonthenetworklayer,Itistheuniqueidentifier(标识)ofeachhostontheinternet.8.What’spingusedfor?Answer:ApplicationsusethePingclasstodetectwhetheraremotecomputerisreachable.AsuccessfulPingindicatesonlythattheremot