This rpm tries its best to setup a local dns cache server.

That being said, it messes about with the following things:
/etc/resolv.conf
selinux policy
/var/named/chroot/etc/named.conf

The zones in the documentation are provided so SL5 can use them for RFC compliance.  They are also the only zones named will offer if you some how get it listening on non-127.0.0.1

if you have NetworkManager installed it modifies /etc/sysconfig/network-scripts/ifcfg-eth*
if you have dhclient installed it modifies /etc/dhcp/dhcp.conf (SL5 /etc/dhcp.conf)
if you have dnsmasq installed it modifies /etc/dnsmasq.conf

to see what all is going on use

rpm -q --scripts zz_local_dns_cache
rpm -q --triggers zz_local_dns_cache

The rpm attempts to preserve backups of things where it can

