It Defines a default domain name that the Cisco IOS software uses to complete unqualified host names (names without a dotted-decimal domain name).
Say for example, your company xyz.com and if you try to initiate a name query for the host abc, if this command is configured, the host "abc" will be converted to a fully qualified name as follows "abc.xyz.com" and then the dns query will be processed.
2) ip domain list
To define a list of default domain names to complete unqualified host names.
For the same example you can configured a list of domain names to be added to the default domain names that will be added to complete unqualified host names.
here you can configure as
ip domain list xyz.com test.com trial.com
Each of the domains that you specified in the above command will be tried in turn.
If there is no domain list configured, the domain name that you specified with the ip domain name global configuration command is used. If there is a domain list, the default domain name is not used. The ip domain list command is similar to the ip domain name command, except that with the ip domain list command you can define a list of domains, each to be tried in turn.
So for both these commands you should be supplying the domain names, not the ip address of the dns server.
3) The command "ip name-server" specifies the dns server ip address, that will be used for resolving the hostname to ip address.
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