client behavior - cname vs A record

[Wang Chung]

Assuming that a client follows RFC standards (I know I assume a bit too much 
;) ), how would a client behave in this situation?

A client makes a request for a hostname which is actually cnamed to another 
hostname.

Now, the answer he will receive will have the cname record with a ttl, as 
well as the A record (for the cname target hostname) with a ttl value as 
well.

What ttl value will be honored? In other words, will the client re-request 
name resolution when the cname or A record ttl is reached?

Thanks
Wang

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