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ANSWER:
A CNAME is simply an alias for a host record. CNAMEs allow you
to have more than one DNS name for a host record. CNAME records point
back to the A record. So if you change your IP address in your A record,
all your CNAME records will automatically follow the new IP of the A record.
The alternative solution is to have multiple A records, but then you would
have multiple places to change the IP address which increases the chances
of error. Using CNAMEs is just more efficient. The most common CNAMEs
are www and ftp.
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