A picture illustrating the DNS lookup procedure
DNS Stuff: DNS tools, WHOIS, tracert, ping, and other network tools
root-servers.org - list of root servers and who operates each. (Includes a map of root server locations.)
ISO-3166 — The source for the two-letter country-code TLDs (ccTLDs)
RFC 2606, Reserved Top Level DNS Names
CAcert Inc: The Free Community Digital Certificate Authority
SASL: Simple Authentication and Security Layer (Cyrus)
RFC 2222, Simple Authentication and Security Layer (SASL)
VeriSign.com (Now part of Symantec)
Global Whois Gateway (From ZoneEdit.com)
/etc/sysconfig/network-scripts/ifcfg-eth0
/etc/named.conf (caching only)
/etc/named.conf (caching and forwarding)
/var/named/named.ca (hints file)