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22.What is wrong with the following zone records? 
domain.org.       IN    MX 7    mail.domain.org
mail.domain.org   IN    CNAME   server.domain.org
server.domain.org IN    A       192.168.1.1

Hostnames on the left half of the record must not be fully qualified.
MX record priorities must be in multiples of 10.
CNAME should be CANON for BIND and above.
BIND requires matching IN6 records.
MX records should not point to a CNAME.

Explanation
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