MACROMEDIA COLDFUSION 4.5-ADMINISTRING COLDFUSION SERVER Manual page 162

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The following figure illustrates these concepts.
dev.allaire.com
Zone
DNS servers store information about the domain name space and are referred to as
name servers. Name servers typically have one or more zones for which they are
responsible. The name server has authority for those zones. When you configure a
DNS name server, you tell it all the other DNS name servers that are in the same
domain.
DNS record types, server aliases, and round-robin distribution
There are three DNS record types that you must define and configure for each Web
server in order for ColdFusion's load balancing and failover technology to work
correctly. These records must be defined and configured on your local and primary
DNS servers.
A Record
This record contains a host name to IP address mapping, where the natural
language name is the primary name representing the IP address.
PTR Record
This record contains the IP address to host name mapping. This is the reverse
lookup of the A record, in which given the IP address, the natural language host
name for the IP address is displayed.
CNAME Record
CNAME is short for Canonical record. This record contains an alias name that
maps to the primary host name of the Web server. For example, if you have a
com
edu
Allaire
dev
ftp
...
ntserver
Administering ColdFusion Server
...
gov
allaire.com
Zone
allaire.com Domain