The document discusses DNS interview questions and answers. It covers topics such as: - The main purpose of a DNS server is to resolve FQDN hostnames into IP addresses and vice versa. - The port number for DNS is 53. - Primary, secondary, and AD integrated are different DNS roles. - Zones are subtrees of the DNS database that contain resource records with information about network resources. - PTR records need to be created to set up reverse name resolution for secure services. - SOA records contain information like the email of the administrator and serial number used for zone transfers. - The first step a client takes to resolve a FQDN is

1. DNS interviewQuestions:
III.DNS interviewQuestions:
WindowsDNSServerInterviewQuestions –Part 1
By admin| Published:June 26,2012
What isthe mainpurpose of a DNS server?
DNS serversare usedtoresolve FQDN hostnamesintoIPaddresses andvice 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.
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

2. 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
likelycause of thisfailure ?The zone youcreatedwasnotconfiguredtoallow dynamicupdates.The local
interface onthe DNSserverwasnot configuredtoallow dynamicupdates.
Whichof the followingconditionsmustbe satisfiedtoconfigure dynamicDNSupdatesforlegacyclients
?
The zone to be usedfordynamicupdatesmustbe configuredtoallow 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.

3. Active DirectoryintegratedDNSenablesActive Directorystorage andreplicationof DNSzone databases.
Windows2000 DNS server,the DNSserverthatis includedwithWindows2000 Server,accommodates
storingzone data inActive Directory.
Whenyouconfigure a computeras a DNSserver,zonesare usuallystoredastextfileson name 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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