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DNS flash cards focused on Linux+ exam objectives

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Question
Answer
hostname look-ups   dig, host, nslookup all perform hostname look-ups through DNS  
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zone   a DNS delegation point that maps to a domain  
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Forward Zone   used for mapping hostnames to IP addresses  
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Reverse Zone   used for mapping IP addresses to hostnames  
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zone file '*.zone'   file located in /var/named/ that contains resource records  
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Root Hints   files in DNS servers that contain host information and addresses of the root DNS servers Points to authoritative DNS servers for external name resolution  
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namespace   unique portion of FQDN (srvA.domain.com and srvB.domain.com)  
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Zone File Directives   specify task to be performed by name server abd settings of a zone. always begins with '$'  
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$INCLUDE   configures named daemon to include extra zone files in the current zone file  
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$ORIGIN   appends domain name to NetBIOS names  
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$TTL   sets default Time To Live (TTL) value for zone.  
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DNS resolver   client based software program that sends DNS requests to servers both local and remote (external)  
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Primary or Master DNS Server   maintains original information about zones and zone records  
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Secondary or Slave DNS Server   processes requests send by other name servers to resolve hostnames  
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Caching Only DNS Server   provides name to IP resolution not authoritative cached results are controlled by TTL settings  
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Forwarding DNS Server   forwards DNS requests to a specific list of DNS servers  
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Berkeley Internet Name Domain (BIND)   domain name service that resolvs hostnames to IP addresses named is the daemon it sits on  
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stub Resolver   DNS resolver that increases name resolution speed by querying multiple DNS servers references the /etc/nsswitch.conf for query priority  
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dig   interacts with DNS servers and displays results to users.  
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dig -b   sets source IP for the query and queries DNS servers using that IP  
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dig -f   enables queries based on processes listed in the specified file  
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dig -p   specifies the port to send queries through  
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dig -4   forces IPv4 protocol  
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dig -6   forces IPc6 protocol  
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dig -t (query type)   sets query type ( soa, axfir, ixfir and MX  
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dig -* +tcp   set resolver to use TCP service to query  
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dig -* +domain=(name)   create search list for desired domains  
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dig -* +search   configure resolver to user search list specified in /etc/resolv.conf file  
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dig -* +nssearch   configure resolver to search for name servers based on zone  
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dig -* +identify   display IP and port no. of answering name server  
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dig -* +trace   trace DNS query for root name server from the /etc/resolv.conf file  
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host   DNS utility similar to dig  
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host name   set the domain same to be looked up by the host utility  
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host -t {query type}   set type of query to be sent to nae server  
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host -W {seconds}   set resolver wait time in seconds  
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host -s   for resolver to terminate query once it fails.  
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resolver files   files used to configure DNS resolvers  
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hosts file   /etc/hosts static host to IP mapping  
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host.conf   /etc/host.conf contians info on how lookups are performed  
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nsswitch.conf   /etc/nsswitch.conf name server switch config file contains information about hosts databases  
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resolv.conf   /etc/resolv.conf resolver configuration file set of routines in the C library that provide access to external DNS  
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named.conf   user defined config file used to manage BIND  
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