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III.DNS interviewQuestions:
WindowsDNSServerInterviewQuestions –Part 1
By admin| Published:June 26,2012
What isthe mainpurpose of a DNS server?
DNS serversare usedtoresolve FQDN hostnamesintoIPaddressesandvice versa.
What isthe portno of dns?
53.
What isa ForwardLookup?
ResolvingHostNamestoIPAddresses.
What isReverse Lookup?
It?sa file containshostnamestoIPmappinginformation.
What isa Resource Record?
It isa recordprovidesthe informationaboutthe resourcesavailableinthe N/Winfrastructure.
What are the diff.DNSRoles?
StandardPrimary,StandardSecondary,& ADIntegrated.
What isa Zone?
Zone isa subtree of DNSdatabase.

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Secure servicesinyournetworkrequire reversename resolutiontomake itmore difficulttolaunch
successful attacksagainstthe services.Tosetthisup,youconfigure a reverse lookupzoneandproceed
to add records.Whichrecord typesdoyouneedto create?
PTR Records
SOA records mustbe includedineveryzone.Whatare theyusedfor?SOA recordscontaina TTL value,
usedbydefaultinall resource recordsinthe zone.SOA recordscontainthe e-mail addressof the person
whois responsible formaintainingthe zone.SOA recordscontainthe currentserial numberof the zone,
whichisusedinzone transfers.
By default,if the name isnotfoundinthe cache or local hostsfile,whatisthe firststepthe clienttakes
to resolve the FQDN name intoanIP address?
Performsarecursive searchthroughthe primaryDNS serverbasedonthe networkinterface
configuration.
What isprimary,Secondary,stub& AD IntegratedZone?
PrimaryZone:– zone whichissavedas normal textfile withfilename(.dns)inDBSfolder.Maintainsa
read,write copyof zone database.
SecondaryZone:– maintainsaread onlycopyof zone database onanotherDNSserver.Providesfault
tolerance andloadbalancingbyactingas backup servertoprimaryserver.
Stubzone:– containsa copyof name serverandSOA recordsusedforreducingthe DNSsearch orders.
Providesfaulttolerance andloadbalancing.
How doyou manuallycreate SRV recordsinDNS?
Thisis onwindowsservergotorun —> dnsmgmt.mscrightclickonthe zone youwantto add srv record
to and choose “othernewrecord”and choose service location(srv).
What isthe mainpurpose of SRV records?
SRV records are usedin locatinghoststhatprovide certainnetworkservices.
Before installingyourfirstdomaincontrollerinthe network,youinstalledaDNSserverandcreateda
zone,namingitas youwouldname yourAD domain.However,afterthe installationof the domain
controller,youare unable tolocate infrastructure SRV recordsanywhere inthe zone.Whatisthe most

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likelycause of thisfailure ?The zone youcreatedwasnotconfiguredtoallow dynamicupdates.The local
interface onthe DNSserverwasnot configuredtoallow dynamicupdates.
Whichof the followingconditionsmustbe satisfiedtoconfigure dynamicDNSupdatesforlegacyclients
?
The zone to be usedfordynamicupdatesmustbe configured toallow dynamicupdates.The DHCP
servermustsupport,andbe configuredtoallow,dynamicupdatesforlegacyclients.
At some pointduringthe name resolutionprocess,the requestingpartyreceivedauthoritativereply.
Whichfurtheractionsare likelytobe takenafterthisreply?Afterreceivingthe authoritative reply,the
resolutionprocessiseffectivelyover.
Name 3 benefitsof usingAD-integratedzones.
Active DirectoryintegratedDNSenablesActive Directorystorage andreplicationof DNSzone databases.
Windows2000 DNS server,the DNSserverthatis includedwithWindows2000 Server,accommodates
storingzone data inActive Directory.
Whenyouconfigure a computeras a DNSserver,zonesare usuallystoredastextfilesonname servers
that is,all of the zonesrequiredbyDNSare storedina textfile onthe servercomputer.
These textfilesmustbe synchronizedamongDNSname serversbyusingasystemthatrequiresa
separate replicationtopologyandschedule calledazone transferHowever,if youuse Active Directory
integratedDNSwhenyouconfigure adomaincontrollerasa DNS name server,zone dataisstoredas an
Active Directoryobjectandisreplicatedaspartof domainreplication.
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