/etc/hosts
It can also be used to resolve hostnames on small networks with no DNS server. For more information, refer to the hosts man page.
/etc/resolv.conf
This file specifies the IP addresses of DNS servers and the search domain. For more information about this file, refer to the resolv.conf man page.
/etc/sysconfig/network
This file specifies routing and host information for all network interfaces.
/etc/sysconfig/network-scripts/ifcfg-
For each network interface, there is a corresponding interface configuration script. Each of these files provide information specific to a particular network interface.
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source:http://linuxpoison.blogspot.com/2008/03/1357817580315.html