DNS Services Command List

DNS Services Command List

The Domain Name System (DNS) is a database that maps logical host names to IP addresses. The following table describes the difference between a router and a workstation when resolving a logical host name to an IP address:

Device	Details
Router	A router's DNS name resolution looks for information in the following places (in this order): Static DNS entries DNS server query (if enabled)
Workstation	A workstation's DNS name resolution looks for information in the following places (in this order): Local DNS cache HOSTS file DNS server query (Primary) DNS server query (Secondary) Note: Additional DNS servers are only consulted if the primary DNS server did not respond (i.e. it is offline).

Use the following commands to configure DNS services on a router:

Use...	To...
router(config)#ip host <name> a.b.c.d	Create static DNS entries
router(config)#ip domain-name <name>	Configure the router default domain (for DNS)
router(config)#ip name-server a.b.c.d	Set the default DNS name server
router(config)#ip domain-lookup	Enable the router to use DNS to identify IP addresses from host names
router(config)#no ip domain-lookup	Disable the broadcast name resolution of host names.
router#show hosts	Display a list of known IP hosts

 

 

Credit: Testout 640-802 CCNA Notes