Proper implamentation of A and CNAME records

[Eric Senf]

OK... I have seen what's out on the Internet but I want to ensure that 
this is done properly.

We have a web site. We want this site to be at both www.domain.com and 
domain.com. I know it is not proper to CNAME a root domain entry thus 
creating an A record for www.domain.com and a CNAME for domain.com 
won't work. I also know it's not proper (though this is what most site 
do like M$, Sun, etc.) is to create two A records for the same IP, one 
pointing to www.domain.com and domain.com.

Is this properly accomplished by creating an A record for domain.com 
and then a CNAME for www.domain.com?

Thanks for any guidance,
Eric.