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Linux+ Ch12 DNS
DNS flash cards focused on Linux+ exam objectives
| Question | Answer |
|---|---|
| hostname look-ups | dig, host, nslookup all perform hostname look-ups through DNS |
| zone | a DNS delegation point that maps to a domain |
| Forward Zone | used for mapping hostnames to IP addresses |
| Reverse Zone | used for mapping IP addresses to hostnames |
| zone file '*.zone' | file located in /var/named/ that contains resource records |
| 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 |
| namespace | unique portion of FQDN (srvA.domain.com and srvB.domain.com) |
| Zone File Directives | specify task to be performed by name server abd settings of a zone. always begins with '$' |
| $INCLUDE | configures named daemon to include extra zone files in the current zone file |
| $ORIGIN | appends domain name to NetBIOS names |
| $TTL | sets default Time To Live (TTL) value for zone. |
| DNS resolver | client based software program that sends DNS requests to servers both local and remote (external) |
| Primary or Master DNS Server | maintains original information about zones and zone records |
| Secondary or Slave DNS Server | processes requests send by other name servers to resolve hostnames |
| Caching Only DNS Server | provides name to IP resolution not authoritative cached results are controlled by TTL settings |
| Forwarding DNS Server | forwards DNS requests to a specific list of DNS servers |
| Berkeley Internet Name Domain (BIND) | domain name service that resolvs hostnames to IP addresses named is the daemon it sits on |
| stub Resolver | DNS resolver that increases name resolution speed by querying multiple DNS servers references the /etc/nsswitch.conf for query priority |
| dig | interacts with DNS servers and displays results to users. |
| dig -b | sets source IP for the query and queries DNS servers using that IP |
| dig -f | enables queries based on processes listed in the specified file |
| dig -p | specifies the port to send queries through |
| dig -4 | forces IPv4 protocol |
| dig -6 | forces IPc6 protocol |
| dig -t (query type) | sets query type ( soa, axfir, ixfir and MX |
| dig -* +tcp | set resolver to use TCP service to query |
| dig -* +domain=(name) | create search list for desired domains |
| dig -* +search | configure resolver to user search list specified in /etc/resolv.conf file |
| dig -* +nssearch | configure resolver to search for name servers based on zone |
| dig -* +identify | display IP and port no. of answering name server |
| dig -* +trace | trace DNS query for root name server from the /etc/resolv.conf file |
| host | DNS utility similar to dig |
| host name | set the domain same to be looked up by the host utility |
| host -t {query type} | set type of query to be sent to nae server |
| host -W {seconds} | set resolver wait time in seconds |
| host -s | for resolver to terminate query once it fails. |
| resolver files | files used to configure DNS resolvers |
| hosts file | /etc/hosts static host to IP mapping |
| host.conf | /etc/host.conf contians info on how lookups are performed |
| nsswitch.conf | /etc/nsswitch.conf name server switch config file contains information about hosts databases |
| resolv.conf | /etc/resolv.conf resolver configuration file set of routines in the C library that provide access to external DNS |
| named.conf | user defined config file used to manage BIND |
Created by:
arosenberg981
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