AllnetworkserversrunWindowsServer2003.AllclientcomputerIPaddressesareassignedbyusingaDHCPserverthatislocatedineachoffice.Clientcomputersarereimagedoftenandareassignednewnameseachtimetheyarereimaged.AllclientcomputersareconfiguredtoreferencetheirlocalDNSserverasthepreferredDNSserverandtoreferencethecentralDNSserverasthealternateDNSserver.Aprimaryzoneforlitwareinc.comisconfiguredonaserverintheLimaoffice.Secondaryzonesareconfiguredonaserverineachbranchoffice.Theretryinterval，therefreshinterval，theexpirationinterval，andthedefaultminimumTimetoLive（TTL）intervalareconfiguredwiththedefaultsettings.Networkbandwidthutilizationaverages40percent.ThenetworkconnectionbetweentheLimaofficeandtheBogotaofficefailsanaverageoftwiceperday.UsersintheBogotaofficeoccasionallyreceiveincorrectresponsestoqueriesagainstthelocalDNSserverwhenthenetworkconnectionisinterruptedduringazonetransfer.
Youneedtochangetheconfigurationofthestartofauthority（SOA）resourcerecordforlitwareinc.com.Inaddition，youneedtoreducethepossibilitythatuserscanquerylocalDNSzonesbeforesuccessfulzonetransfersoccur.
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