Mainframeclassification
Computermainframe
referstothecontainer(Mainframe)usedtoplacethemotherboardandothermaincomponentsinthecomputerhardwaresystem.UsuallyincludeCPU,memory,harddisk,opticaldrive,powersupply,andotherinputandoutputcontrollersandinterfaces,suchasUSBcontroller,graphicscard,networkcard,soundcard,etc.Theoneslocatedinthemainboxareusuallycalledinternaldevices,andtheonesoutsidethemainboxareusuallycalledperipherals(suchasmonitors,keyboards,mice,externalharddrives,externalopticaldrives,etc.).Usually,thehostitself(afterinstallingthesoftware)isalreadyacomputersystemthatcanrunindependently,andacomputerwithaspecialpurposesuchasaserverusuallyhasonlythehostandnootherperipherals.
internethost
Anycomputerconnectedtotheinternetiscalledahost,andeachhosthasauniqueIPaddress.EachhostThestatusontheInternetisequal.
Minicomputerhost
Theminicomputerhostisahigh-performance,low-power,ultra-quietminicomputer,supporting1080PresolutionHDvideoplaybackThedeviceisalsoastylishhomedeviceforhomedecoration,surfingtheInternetandwatchingmovieswithoutshowinganyweakness.
VirtualHost
1.Networkspace:alsocalledwebspace,itisthemainspaceforstoringwebpages,programs,picturesandotherwebfiles;
2.Databasespace:thedatabasestoragespaceprovidedbythevirtualhostthatsupportsthedatabase;
3.Logspace:thestoragespaceforwebsitelog(log)files.
Virtualhosting,(alsocalledwebsitespace)istodivideacertainamountofdiskspaceonthenetworkserverforuserstoplacesites,applicationcomponents,etc.,andprovidenecessarysitefunctions,datastorage,andtransmissionfunctions.TheemergenceofvirtualhosttechnologyisamajorcontributiontoInternettechnologyandablessingtothemajorityofInternetusers.Sincemultiplevirtualhostssharetheresourcesofarealhost,thehardwarecosts,networkmaintenancecosts,andcommunicationlinecostsforeachuseraregreatlyreduced,andtheInternethastrulybecomeanaffordablenetworkforeveryone!Now,almostallAmericancompanies(includingsomefamilies)havesetuptheirownwebserversontheInternet,andquiteafewofthemusevirtualhosts!
Theso-calledvirtualhost,alsocalled"webspace",istodivideaserverrunningontheInternetintomultiple"virtual"servers.EachvirtualhosthasanindependentdomainnameandcompleteInternetserver(supportsWorldWideWeb,FTP,e-mail,etc.)function.Differentvirtualhostsonaserverareindependentandmanagedbyusers.However,aserverhostcanonlysupportacertainnumberofvirtualhosts.Whenthisnumberisexceeded,userswillexperienceasharpdropinperformance.
VirtualhostingtechnologyisatechnologyusedbyInternetserverstosaveserverhardwarecosts.VirtualhostingtechnologyismainlyappliedtoHTTPservices,whichlogicallydividesoneoralloftheservicecontentofaserverintomultipleservicesTheunitisexternallyrepresentedasmultipleservers,soastomakefulluseofserverhardwareresources.Ifthedivisionisatthesystemlevel,itiscalledavirtualserver.
Choiceofhostingserviceprovider
1.Thelengthofoperationtimeisanimportantcriterionforevaluatingavirtualhostingprovider.
Second,whethertohaveacomputerroom,whethertohaveareliable,stable,safeandhigh-speedcomputerroomisanotherimportantcriterionformeasuringasuccessfulvirtualhostingprovider.IntheInternetindustry,thereisoftensuchasituation:somecompaniesthemselvesdonothaveacomputerroomorevennocomputerroomatall,buttheyoftenpromisevariousservicestousersatapricemuchlowerthanthemarketprice.Itisconceivablethatwithoutsufficienthardwaresupportandtechnicalstrength,thesepromisesoftenendupbeingunrealisticcastlesintheair.Therefore,itiscertainthatthosecompaniesthatareunwillingtotellcustomersaboutthelocationofthecomputerroommustbevirtualhostingprovidersthatcontainfraudulentelements.Themajorityofusersshouldbehighlyvigilantinthissituation.
3.Highcostperformanceandlowpriceleadtolowerpricesunderperformance.Itisnecessarytopreventserviceprovidersfromdisappearingexcellentreputation,excellentquality,sincereservice,andappropriateprice.Forasuccessfulvirtualhostingprovider,Noneofthesecanbeless.
Four.Requestademoaddressforcustomerswithalargenumberofonlineusersandprovidetrialspace.IDCserviceproviderssuchasXinhejianprovidetrialservices.
Fifth,don'tbegreedyforcheap,rentthehostofaspaceproviderwithacertaincustomerbase.Generallyspeaking,large-scaleserviceprovidershavefarmoreinvestmentinhardwareequipment,networkresources,securityguarantees,humanresources,businessreputation,andmarketpromotionthanordinaryserviceproviders,sotheirpricesareoftenhigher.Buttheservicequalityismoreguaranteed.
Six.ItisbestforserviceproviderstoprovideonlinemanagementfunctionssuchasmailboxesandFTP.
Seven.Onethingthatneedsspecialattentionisthatatpresent,manycrooksusehomePCsasserversandADSLforaccess.Thestabilityandspeedofthisspacearequitepoor,soremembernottobegreedyforthiskindofcheapness.
8.SpacesizeThespacecapacityofavirtualhostisanimportantindicatorforevaluatingtheperformanceofavirtualhost.Undernormalcircumstances,wemustassessthecapacityofthefollowingspacesatthesametime.
Thechoiceofvirtualhost
1.Loadamount
Loadamountisfarmoreimportantthanspacecapacity,althoughtheapplicationofvirtualhostisMultipleusersshareanindependentserver,butitisnecessaryforuserstoknowfromtheserviceproviderhowmanyusersshouldsharethesameserverresourceswiththemselves.Becauseonlyaftertheserviceprovidermakesafairdistributionoftheresourcesoccupiedamongtheusers,cantheactualinterestsofthemajorityofusersbeguaranteed.Iftherearetoomanysharedusersandtheserverisoverloaded,itwillinevitablyreducethestabilityoftheserver,reducetheprocessingpowerofthecpu,andtheprogramwillbedifficulttorun,sothattheusercannotfindthepage,linktothedatabase,orevenaccessthewebsite.Andotherseriousfailures.
Generallyspeaking,accordingtothedifferenttypesofservicesprovidedbythevirtualhost,therearefewuserssharedbyaserver,andthenumberofusersshouldnotexceedthelimitofhundredsofusers.Andsomeserviceproviderswithinsufficientnumberofservers,inordertomaximizetheuseoflimitedhardwareresourcesintheirhands,evenputthousandsofusersonaserver,theeffectcanbeimagined.Therefore,ifwewanttoobtainvirtualserviceswith"reasonableresources"guarantee,wemustpayattentiontothestrengthofserviceproviders.Forexample,howmanyserverstheserviceprovideruses,andthe"specific"commitmenttotheuserloadintheselectedvirtualhostingservice.Therefore,itisbesttochoosealarge-scalewebsitehostingserviceproviderasapartnerinamulti-partycomparison.
Second,traffic
Trafficisthenumberofpossiblevisitstoauser’swebsite.Theserviceprovideralsorestrictsthetrafficofeachuser’swebsiteundertheprincipleoffairdistributionofserverresources.Buttheproblemistheextentoftheirrestrictions.Ifthelimitvalueistoosmall,itwillgreatlyharmtheinterestsofusers.Youcaneventhinkthatifthetrafficvalueissmall,thestoragespaceofthewebsiteisofnouse,becauseitwillmakethebrowsingspeedoftheuserwebsitespecialslow.
Generallyspeaking,aslongasthehardwareresourcesprovidedbytheserviceprovideraresufficient,thetrafficwillnotbetoolimited.Inordertoattractasmanyusersaspossible,serviceproviderswhotryto"makefulluse"oflimitedhardwarefacilitiesandcannotprovidealotoftrafficwilladoptthemethodofonlyaddingharddiskswithoutaddingserversattheexpenseofserverstability.,Toincreasethecapacityofthesametypeofvirtualhostspacebyseveraltensofmegabytestoadvertiseits"super-large"advantage.
3.Numberoflinks
Thenumberoflinksreferstothenumberofvisitorswhocanacceptapplicationsatthesametimeandopenthewebsitepagesatthesametime.ThesizeofthelinkvalueisdirectlyrelatedtotheuserwebsiteonthevirtualhostLoginaccesslevel.Ifthenumberoflinksistoosmall,thenumberofpeoplewhocanvisittheuser'swebsiteatthesametimewillbeverylimited,andtheuser'swebpagewillcauseabnormalconditionssuchaslongwaitingtimeforvisitors.Generally,thesupportstandardforthenumberoflinkswillnotbeanindicatorlimited.However,somesmallserviceproviderscaneasilymonitorusers,forcingthemtochoosehigh-pricedvirtualservicetypes,andalsomakearigidnumericaldivisionofthenumberoflinks,sousersneedtopayspecialattentionwhenpurchasing.
Four.Onlinerate
Sincethewebsiteisbuilt,itshouldalwaysbekeptrunningtoensurethatvisitorscanloginatanytime.Thiswasoriginallyalogicalrequirement,andforeignvirtualhostingprovidersgenerallymakepromisestotheonlinerateoftheiruserwebsites.However,thereareonlyafewserviceprovidersinChinathathaveexplicitlypromisedtoguaranteetheonlinerateofuserwebsites.Mostserviceprovidersarepronetodowntimeduetothelimitationsofbandwidth,hardwareequipmentcapabilities,andtechnicalmanagementcapabilities.Therefore,theycannotorareunwillingtoaddressthisissue.Public"quantitative"guarantees.
Five.Flexibility
Flexibilityiswhethertheserviceprovidercanprovideuserswitheconomicalandconvenientserviceoptions.Therearetwopointsworthyofspecialattentionfromusers:oneiswhethertheycandecidetoincreasetheamountofspaceonthewebsite;theotheriswhethertheycanusedifferentoperatingsystemplatformsatthesameprice.Becausethesetwoissuesaredirectlyrelatedtotheuser'sinterests,oncetheuser'swebsitehasdevelopedtothepointwheretheoriginalspacecapacityisclosetosaturation,theusermustincreasetheconfiguration.Buttheproblemisthatmanyserviceprovidersgenerallydonotallowuserstoincreaseasmallamountofspaceby10megabytesor20megabytesinordertoobtainhighprofits.Usersspendalotofmoneytobuywealthyresourcesthatarenotneededatall.
Thesameistrueofwhethertheoperatingsystemcanbefreelychosen.Someusersareaccustomedtousingtheunixplatform,andsomearegoodatusingwindowsntasawebsiteplatform,butsomemanufacturerswillusethesameTypesofwebsiteservicesaredividedintodifferentgradesinprice.SoIhopeuserswill"shoparound"beforemakingapurchase.
Six.Websitefunctions
FormanycompaniesthatarenewtotheInternet,ifthewebsitemanagementinterfaceprovidedbytheserviceproviderisnotsosimple,easytouse,andthefunctionsarenotsocomplete,Itwillbedifficulttooperateandusethewebsitesmoothlyinthefuture.Therefore,youshouldpayattentiontowhethertheserviceproviderprovidestheuser'swebsitewithfunctionssuchasautomaticgenerationofwebpagemodules,Frontpageextension,etc.,soastosaveyourselfthetroubleofdoingcomplicatedoperations.
Components
1.Chassis(theshellofthehost,usedtofixvarioushardware)
2.Power(hostpowersupplysystem,usedtosupplypowertothehost)Voltagestabilization)
3.Motherboard(connectingthebodyofeachhardwareinthehost)
4.cpu(thebrainofthehost,responsiblefordataprocessing)
5.Memory(temporarilystoringthedatathatthecomputeriscalling)
6.Harddisk(thestoragedeviceofthehost,usedtostoredata)
7.Soundcard(processingcomputeraudiosignals,thereareMainboardintegratedandindependentsoundcard)
8.Graphicscard(processingcomputervideosignals,therearecoregraphicscard(integrated)andindependentgraphicscard)
9.Networkcard(processingcomputerandcomputerNetworksignal,commonpersonalhostsareintegratednetworkcards,mostserversareindependentnetworkcards)
10.CD-ROMdrive(CD-ROMdriveisusedtoreadandwriteCD-ROMdata)
11.Floppydrive(FDDisusedForreadingandwritingdataonfloppydisks,floppydiskshavenowbeencompletelyeliminated)
12.Radiator(adeviceusedtodissipateheatfromhigh-temperaturecomponentsinthehost)
13.Poweronandrestartbutton
p>14.Otheruncommonhardware
Dual-linehost
Whatisdual-linevirtualhost
Theso-calleddualOnlinevirtualhostingisalsocalledsmartdual-linevirtualhostingandsmartdual-linewebspace.Itisasmartdual-linevirtualhostingservicespeciallylaunchedtosolvetheproblemofinterconnectionbetweendomesticNorthandSouthTelecomandNetcomusers.Smartdual-linevirtualhostingreferstothesameserverhavingtwolinesofthetelecommunicationsnetworkandtheNetcomnetwork.Intelligentroutingisusedtodeterminetheuser'sIPaddresstorealizethattelecommunicationsusersvisitthetelecommunicationslinewhentheyvisitthewebsite,andNetcomusersvisittheNetcomlinewhentheyvisitthewebsite,soastoreachthenorthandthesouth.Thepurposeofmutualvisits.
Classificationofdual-linevirtualhosts
TherearethreewaysofsingleIPaddresssinglenetworkcard;dualIPaddresssinglenetworkcard;dualIPaddressdualnetworkcard.Amongthem,singlenetworkcarddualIPanddualnetworkcarddualIPbothhaveatelecomIPaddressandaNetcomIPaddress.TelecomusersaccessthetelecomIPaddress,andNetcomusersaccesstheNetcomIPaddress.OnlyinthiswaycanTelecomNetcomquicklyaccessit.
Intelligentdual-linehost
ButhowtoimplementadomainnametelecomuserstoaccessthetelecomIP?HowcanNetcomusersaccesstheNetcomIPaddress?ThepreviousgeneralpracticewasMakea"telecomstation"and"Netcomstation"onthehomepageofthewebsite,sothattelecommunicationsusersandNetcomuserscanchoosethecorrespondingfastestlineaccordingtotheirownInternetsituation.Butinfact,mostuserssimplyignorelinkssuchas"TelecomStation"and"NetcomStation"whenbrowsingthewebsite,resultinginaverypooruserexperience.Theintelligentdual-linehostcansolvethisproblemwell.Theintelligentdual-linehostistherealizationoftheprovideddomainnameintelligentresolutionsysteminconjunctionwiththedual-linehost.Theprincipleisthatwhenauservisitsawebsite,hefirstqueriestheDNSserverfortheIPaddressofthewebsite.AndtheDNSserverwilldeterminewhethertheuserissurfingtheInternetthroughTelecomorNetcom?IfitisTelecomsurfingtheInternet,itwillreturntheTelecomIPaddress,andifitisNetcomsurfingtheInternet,itwillreturntheNetcomIPaddress.Inthisway,thepurposeofintelligentjudgmentandintelligentidentificationisrealized.Theintelligentdual-linehostavoidsthemanualswitchingprocessofthedual-linehost,andgiveseveryuserofthewebsitethefastestandmoststableuseraccess.Itcanbesaidthattheintelligentdual-linehostisthetruedual-linehost,whichcanberegardedasacompletesolutiontotheproblemoftelecommunicationsandNetcomintercommunication.
Advantagesofdual-linevirtualhosting
DNSintelligentnetworkloadbalancingresolutiontechnology(referredtoasDNSintelligentresolution),istohavetwoormoreatthesametimeInternetcontentinformationserviceproviders(ICPs)indifferentregionsandconnectedtomirrorserversuseDNSintelligentanalysistechnologytoallowtheircontentinformationvisitorsoruserstousethesameareaorthesameaccessISPornetworkwithfastermutualaccessspeedasmuchaspossible.High-speedaccesstotheservicesitprovides,soastofundamentallysolveorreducethedirectorindirecteconomiclossescausedbythelossofwebsiteinformationvisitorsorcustomerscausedbynetworkcongestion.Inthedual-linespace,onespacehastwoIPs,youonlyneedonespacetoachievetheworkthattwoserverscancomplete.
TraditionalCDNaccelerationisstaticpageacceleration.IfyourwebsitehasASPprogramssuchasforums,usersinthenorthwillalsobeslowtovisit.Usingdual-linespace,twoIPsinonespace,usersinthenorthuseNetcom,andusersinthesouthuseTelecom.Becauseitisthesamespace,whetheritisanaspprogramoranordinarywebpage,itisthesamefast.WithintelligentDNSautomaticresolution,itautomaticallyjudgesNetcomandtelecommunicationsusers,andtrulyachievesnorth-southinterconnection.Thetraditionalspaceisfasterforbothnorthandsouthusers:youneedtobuyaspacefortelecommunications,andforNetcomtobuyanotherspace,andyouneedtoupdatetwiceeachtime.Userscan’tviewpostspostedonthetelecommunicationsstation,andcannotbeviewedonthetelecommunicationsstationofNetcom.Look,theNorth-Southinterconnectioncannotbetrulyrealized.
Two-linespace
YouonlyneedtobuyonespacetohavetwoIPs.YoucanuploadthemwithTelecomipandNetcomip.YouonlyneedtodoitonceUpdates,dataiscompletelysynchronized,andtheNorth-Southinterconnectionistrulyachieved.
Communicationhost
Introduction
Acomputerspeciallyusedtocompletevariousdataprocessingtasksinadatacommunicationsystem.Thehostcancompletebasictypesofdataprocessing:messagestorageandforwarding;datacollection,editinganddistribution;filemanagementandprocessing,remotejobinput,batchprocessing,real-timeprocessingandinteractivetime-sharingprocessing,etc.
Constitution
Usually,thehostisageneral-purposeelectroniccomputerwithinternalmemoryandperipheraldevices.Theinternalmemoryisusedtostoretheprogramsrequiredfordataprocessing,theoriginaldataandtheintermediateresultsoftheprocessing.Peripheraldevicesincludeexternalmemoryandinputandoutputdevices.Commonlyuseddiskstorageandtapedrivesareusedasexternalstorage.Theformerisusedtostoreoperatingsystems,systemfiles,batch-processeddataandtoestablishadatabase;thelatterismainlyusedforreceivingandsendinginformationrecordsforlong-termarchivingandalsousedforprogramsDebuggingandfaulttesting.Inputandoutputdevicesincludekeyboardmonitors,lineprinters,X-Yplottersandgraphicterminals.Accordingtothescaleofthesystem,thehostshouldhaveenoughdataprocessingcapacitytoefficientlyprocessrandomlygenerateddatainformation.
Characteristics
Thehostcomputerinthedatacommunicationsystemisdifferentfromthegeneralstand-alonesystem.Itsmaincharacteristicsare:①Forcommunication,ithastheabilityofcommunicationprocessing.Intermsofhardware,ithasaninput/outputchannelcomponentorabusinterfaceconnectedtoacommunicationcontroller.Thesystemsoftwarehasfunctionssuchasanalysisandprocessingofthecentralprocessingunit(CPU)hardwareinterruption,inputandoutputcontrolanderrorrecoveryprocessing,programstartandstopprocessing,multiprocessingandvirtualmemorymanagement.Thecommunicationcontrolprogram(ie,communicationsoftware)isoftencombinedwiththecommunicationcontrollertocontrolthedatatransmissionbetweentheuser'sonlinebusinessprogramandtheremoteterminal.②Withdatabasemanagementfunction.Adatabaseisacollectionofinterrelateddata,whichhasthecharacteristicsofdatasharing,independenceandminimalredundancy,andperformsunifiedmanagementofdata.Oneofthemostimportantapplicationsofcomputernetworksistheestablishmentofgeographicallydisperseddatabasesbetweenhostswithinthenetwork.Thehostssupportuserstoaccesslocalorremotedatabasesthroughadatabasemanagementsystem.③Inordertoensurehighreliability,thereliabilityofasinglehostcomputershouldbehigh,andastandbycomputercanbesetup,oradual-computerworkmodecanbeadopted.
Firsthost
Advantages
Host(40photos)
LowcostAlthoughonlineinformationpublishinghasobviousadvantagesinpropagandafunctions,itslowcostisstillunimaginable.Althoughtheadvertisementsofradioandtelevisionstationsarecalculatedinseconds,thecostisoftentensofthousands,andadvertisementsinnewspapersandperiodicalsarealsoexpensive,whichexceedstheaffordabilityofmostindividuals.Thecostofonlineinformationreleasehasbeengreatlyreducedduetothesavingsintheprintingofnewspapersandtheexpensiveproductioncostsofradioandtelevisionstations,sothatmostunitscanaffordit.Coveringawiderange,traditionalmedia,whethertelevision,newspapers,radio,orlightboxposters,cannotcrossgeographicalrestrictionsandcanonlyhaveanimpactonspecificareas.Theprobabilityofatransactionishigh.Fortraditionalmediaadvertisements,mostoftheaudiencepassivelyacceptit,anditisnoteasytoproduceresults.Theformislivelyandlively,usingcomputermultimediatechnology,onlineinformationinvariousformssuchasgraphics,text,audio,image,etc.,directlydisplaytheproduct'sshape,purpose,usemethod,price,purchasemethodandotherinformationtotheuser.Withreal-timenature,merchantscanchangetheadvertisingcontentatanytimeaccordingtomarketneeds,whichisflexibleandconvenient.Moreimportantly,forenterprisesandinstitutionalusers,thisiscurrentlythemosteconomical,convenientandpracticalway.Therearenearly100millioncomputersontheInternet.Nomatterwhattypeofcomputertheyare,whatoperatingsystemtheyrun,andwhatsoftwaretheyuse,theycanbeclassifiedintotwocategories:clientandserver.
Theclientisamachinethataccessesotherpeople'sinformation.Whenyoudial-uptheInternetthroughthepostofficeorotherISP,yourcomputeristemporarilyassignedanIPaddress.WiththistemporaryID,youcanobtaininformationintheoceanoftheInternet.Whenyoudisconnect,youTheIPaddressofthecomputerwastakenawayfromtheInternet.
Aserverisamachinethatprovidesinformationforotherstoaccess,andisusuallycalledahost.Sincepeoplecanaccessitatanytime,asahost,itmustbeconnectedtotheInternetatalltimesandhaveitsownpermanentIPaddress.Tothisend,itisnecessarynotonlytosetupdedicatedcomputerhardware,butalsotorentexpensivedatalines,plusvariousmaintenancecostssuchasrent,labor,electricity,etc.,whicharebynomeanseasytobear.Forthisreason,peoplehavedevelopedvirtualhosttechnology.
Usingvirtualhosttechnology,arealhostcanbedividedintomany"virtual"hosts,eachvirtualhosthasanindependentdomainnameandindependentIPaddress,andhasacompleteInternetserverfunction.Virtualhostsarecompletelyindependent.Fromtheoutsideworld,eachvirtualhostisexactlythesameasanindependenthost.Theeffectisthesame,butthecostisquitedifferent.Sincemultiplevirtualhostssharetheresourcesofarealhost,thecostofhardware,networkmaintenance,andcommunicationlinesthateachvirtualhostuserbearsisgreatlyreduced,andtheInternethastrulybecomeanaffordablenetworkforeveryone!
Currently,manycompaniesusethismethodtobuildwebsites,whichnotonlygreatlysavesthecostofbuyingmachinesandrentingdedicatedlines,butalsodoesnothavetoworryaboutthetechnicalproblemsofusingandmaintainingservers,letalonehiringspecializedmanager.
Hostrental
Thefirstelementspeed
Today,Iwilltalkabouttwopointsofspeed.
Firstofall,thespeedofhostlease.Thespeedofthehostisthefeaturementionedforthefirsttime.Ourhostisthebestchoiceinbuyingalease,thespeedofthefirstpinghost,ortestingthedownloadspeed.Nowmostofthespacesprovidetrialservices,trialsatisfiedpayment.Therefore,ifwecan'tprovidespacetrialservices,wemustbecarefulorgiveupaltogether.
Secondly,processingspeed.Whenhelpingussolvetheproblemofthehostwerent,spaceisessential,especiallytheprocessingspeed,whichcanreflecttheformalityandcredibilityofthespaceprovider.Iftheproblemofthehost,thespaceproviderdelays,ithasnotbeenresolved,butitisworriedaboutdeath.Thespeedatwhichsomespacesprovideafter-salesservicetosolveproblemsiscompletelydifferent,whichisquitedisgusting.
SecondElementSecurity
Ifthewebsiteisvisitedfor3daysandthehostorcomputerroomofthespaceproviderisSpaceisanissue.Havingourwebsitedoesnotnecessarilyguaranteethatitwillnotbeattacked.Themostimportantthingistoseeiftheyprovidedatabackupservices.Ifourwebsitefails,thewebsitecannotberestoredintime.
Thirdfactorlineselection
OurdomestichostleasesmainlyfocusontelecommunicationsandChinaNetcomlines.ManyIDCprovidershypeuptheirtwohostleases,sayingonlythatitismoreexpensivethanasingleline,andthatitisalittlebitfasterfornorth-southsharing.However,somepeoplesaythatthisissimplynonsense,anditwouldbebetter.Idon'tknowwhetherthiscanbeaNorth-Southexchange.IthinkthemaindistributionareaorcustomergroupthatIchoose,accordingtomywebsite,themajorityofSouthernTelecomusersareamazing.Thecountry'scustomersandfundsallow,andthenchoosetwohosts.
Fourthelementvalue-addedservice
Webuyadedicatedhostwillhaveaseparatecontrolpanel,whichisconvenientforustomanagealltheoperationspace.CombinedwiththeerrorpagesettingsofthedomaindatabaseaccessandFTPinformationmanagement,Icheckedwhatwasoriginallycalledthehostmanagementsystem.Theabilityofthistechnologyisnotstrong.Thewebmasterisquiteuseless.However,inordertopurchaseahostingserviceproviderwhodoesnothavethisrequirement,itcanhelpustouploadthehosting.Althoughitwasdownloadedonline,buthowshouldIsay,Ithinkthecommercialspaceversionwillhavebettersecurity.
Fifthelementreputation
Ithinkreputationisthemostimportantthingwhenchoosingahosttorent,soIputthelastpoint.
Implementationmethod
Thetwo-linevirtualhostisactuallyaserverwithtwolinesofTelecomandNetcomrespectively.Throughtheintelligentanalysisoftheuser'sIPaddress,thetelecomuserscanaccessthetelecomLines,NetcomusersaccessNetcomlines,soastoachievethepurposeoffastaccessthroughoutthecountry.Accordingtodifferentcomputerroomaccessmethods,therearethreeaccessmethodsfordual-lineserviceaccess:singleIPaccess,singlenetworkcarddualIPaccess,anddualnetworkcarddualIPaccess.ThebestoneissinglenetworkcarddualIPaccess.ProvideatelecomIPandNetcomIPrespectively.Howthedual-lineandmulti-linetechnologiesareeffective?Therearetwokeyissues,oneisthenetworkcardandIPworkingmodeadopted,andtheotheriswhethertheintelligentanalysisoftheuser'sIPaddressisstableandreliable.
Networkcardselection
1.Dual-networkcardanddual-IPdual-line:Intheearlydays,somecomputerroomscouldnotswitchonthecomputerroomrouterduetotheirowntechnology/equipment.Theycouldonlyuseoneserverandtwonetworkcards,andthetwonetworkcableswereconnectedtoTelecom/Netcom.Thisleadstorandomfluctuationsinserverrouting,andcausesuserstovisitquicklyandslowly,orevencompletelyinaccessible.Thisisactuallyabackwardmethodthathasbeeneliminated.
2.Single-IPdual-line:Single-linesingleIPrealizesdual-line.Thisisanewroutingtechnology.ThisIPdoesnotbelongtoanytelecomoperator.Whenparsing,itwillautomaticallydeterminethetypeoflinethevisitoris,andmaketheIPtakethattype.Linetomeettheneedsofeachline.However,thesingle-IPdual-lineserviceisbasedontheuserlineatthecomputerroomrouterleveltoswitchthecorrespondingtelecommunications/netcomline.Sincemostdual-linecomputerroomsobtainIPaddressesfromTelecomandNetcom,theydonothavetheauthoritytoswitchlines,whichmakesitimpossibletoreachtheentirenetwork.Forthefastpurpose,somecomputerroomswithIPautonomousdomainscannotobtainsufficientbandwidthfromChinaTelecom/Netcom,resultinginunsatisfactoryuseraccessspeeds.
3.SmartduallinewithsinglenetworkcardanddualIP:Thismethodissimilartotheabove,butbecausetwoIPsareboundtoasinglenetworkcard,youcanobtainIPaddressesfromTelecom/Netcomrespectively,andswitchintelligentlythroughthedomainnameresolutionservertoavoidTheweaknessesofsingleIPandduallinesareovercome,andfastaccesstotheentirenetworkistrulyrealized.
SomeoperatorsontheInternetalsousethird-partyISPlinestoachievethedual-lineeffect,whichistousenon-telecomandnon-Netcomlines,suchasChinaMobileandChinaUnicom.ThespeedofthiskindoflineconnectiontobothChinaTelecomandNetcomisverygood,andtheeffectissimilartothatofarealtwo-line,butafterall,therearebandwidthlimitations,andthespeedofsmallwebsitesisverygood,butlargewebsiteswillnotwork.
So,whenyouchoose,youcantrytochooseasinglenetworkcarddualIPduallineorathird-partyISPline,theeffectisgood.
IPaddressresolution
Nomatterwhatkindofdualline,youneedtoresolvetheIPaddressoftheuserandtheservertoselecttheline,sotheIPaddressResolutiontechnology,equipment,andacomprehensiveandlargeaddresslibraryareveryimportant-theprincipleisthatwhenauservisitsawebsite,theDNSserverfirstqueriestheIPaddressofthewebsite,andtheDNSserverwilldeterminewhethertheuserisgoingtotheInternetthroughTelecomorNetcom?IfitisatelecomInternet,itwillreturnthetelecomIPaddress;ifitisNetcomInternet,itwillreturntheNetcomIPaddress;inthisway,thepurposeofintelligentjudgmentandintelligentidentificationcanberealized.Becausethiskindofresolutiontechnologyhasacertainthreshold,noteveryoperatorcanrealizeit,andonlythetwo-linehostthatadoptsintelligentDNSresolutioncanbesaidtobeatruetwo-lineservice.