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.
Help!
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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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