domain name system - Do CNAME records overrule A records?

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I have several A records like
so:

Subdomain IP
            Address
example.example.com 198.51.100.0

example.com
            203.0.113.0

And a
CNAME record that looks like
this:

Alias
            Destination
www.example.com
            example.com

I
want to make example.com throw a 301 redirect to www.example.com.

So I'd change the last A Record
to:

www.example.com
            203.0.113.0

And swap
the two URLs in the CNAME record to look like the
following:

example.com
            www.example.com

Question:
Is this change going to make example.example.com resolve to 203.0.113.0
instead of to 198.51.100.0?

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class="normal">Answer

If you
have an A record for example.foo.com then no DNS record for any other domain will affect
that. So the answer is no.

Other facts to bear
in mind:

You can't have a CNAME and an A record
for the same fully qualified domain

A CNAME is
not he same as a 301 redirect.

A CNAME will return the same ip
address as the new domain. Your browser will go to that ip asking for the original
domain.
A 301 redirect will cause your browser to do a DNS lookup for the new
domain and then go and ask for the new domain.