A CNAME is an alias for a host record, it maps an alias to its canonical name. The alias gains all properties of the original host record, including IP addresses and mail routes. A typical CNAME might be used to redirect a subdomain (ftp.loaddns.com) to a host record (www.loaddns.com.)
Host Name: ftp.loaddns.com is the Host Name we are making an alias for. TTL (Time to Live): The TTL number 1200 is in seconds and corresponds to how long the record stays cached in other systems. The lower the number the more frequent systems will go to the DNS servers for queries. Resolves To: www.loaddns.com. is the host name which ftp.loaddns.com. is an alias to.
When a DNS server is queried for ftp.loaddns.com. our system realizes it is the alias for www.loaddns.com. ftp.loaddns.com. takes on all the properties of www.loaddns.com.
See also:
Canonical Name
Resource Record
TTL