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

Sender Policy Framework

SASL: Simple Authentication and Security Layer (Cyrus)

RFC 2222, Simple Authentication and Security Layer (SASL)

Educause .edu WHOIS lookup

Internic WHOIS lookup

.INFO WHOIS lookup

IPv6 Tools

Moniker.com

Name.com

Public DNS Server List

VeriSign.com (Now part of Symantec)

Global Whois Gateway (From ZoneEdit.com)

IANA

ICANN

IETF

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Sample Configuration Files

/etc/hosts

/etc/networks

/etc/resolv.conf

/etc/nsswitch.conf

/etc/sysconfig/network

/etc/sysconfig/network-scripts/ifcfg-eth0

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/etc/named.conf (caching only)

/etc/named.conf (caching and forwarding)

/etc/named.conf (primary)

/etc/named.conf (secondary)

/etc/rndc.conf

/etc/rndc.key

named.rfc1912.zones

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/var/named/gcaw.zone

/var/named/10.142.255.zone

/var/named/localhost.zone

/var/named/named.local

/var/named/named.ca (hints file)

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/etc/sysconfig/iptables

/etc/hosts.allow

/etc/hosts.deny

/etc/dhclient-eth0.conf

/etc/logrotate.d/named