When you "ping server" and "ping server.domainname", you
get different results. Why?

Answer Posted / shareef

Dear Colleagues

/etc/nsswitch.conf decides on the services used for a
variety of name resolution requirements
the part of interreset for this question is :

hosts: files ----> this will only resolve hostnames
from the /etc/hosts file
but if you add 'dns' next to files ; then you activate the
name resolution service [otherwise called to DNS client] ;
that used to resolve names through hosts file to resolve
names [ this time through dns naming model] from the server
configured in /etc/resolve.conf

which may look something like this

myhost# cat /etc/resolv.conf
domain mydomain.internal
search mydomain.internal
options retry:1 timeout:1
nameserver 10.234.206.73
nameserver 10.10.98.38


this file direct the name resolution through the configured
nameserver ; and will search for a given hostname through
hosts file first then through DNS resolution by appending
the configured domain name

regards

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