Need for DNS "Alias" record?

Instead of creating a DNS CNAME ("Alias"), as shown in
http://support.microsoft.com/kb/168322
what is wrong with this approach?
mySqlServerPublicName HOST (A) 123.......
mySqlServerPrivateName HOST (A) 172.16......
The name of the underlying physical box is "mySqlServerPrivateName" but end users should only refer to it, and access it, using "mySqlServerPublicName". (In short, I don't understand why a CNAME record is needed at all in this case)
TIA,
edm2

mySqlServerPrivateName refers to HOST (A) 123....
mySqlServerPrivateName refers to HOST (A) 172.16....
the purpose of the CNAME is, let's say out of the blue, your boss tells you that for the IP Address HOST (A) 123...
change the IP Address to 220.... but all the users remember it as mySqlServerPrivateName.
So you just change the Host (A) to 220 ... but the user's doesn't know that the IP Address has been changed.
You don't have to inform user about the change of IP if the alias or cname is still the same.
Hope it helps...
Every second counts..make use of it. Disclaimer: This posting is provided AS IS with no warranties or guarantees and confers no rights.
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