Short for canonical name. a record in a DNS database that indicates the true, or canonical, host name of a computer that its aliases are associated with. Sometimes more than one domain name resolves to the same IP address, and this is where the CNAME is useful. A machine can have an unlimited number of CNAME aliases, but a separate CNAME record must be in the database for each alias.
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DNS Records - resolve
A record vs. CNAME (A used for IPv4, AAAA for IPv6)
1. How to create a CNAME to point rejiao.com to home.com
advantages
-Quickly change the IP address for a group of records; you just change the IP of the A record instead of all the records
-Point your record to a zone entry you don't control (e.g. www.mydomain.com. IN CNAME www.someotherdomain.com.)
-even if IP address of the host is changed, DNS server doesn't require any change.
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