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8. The SOA resource record in a zone file contains 5 numbers, what is the usage of the last one?
Name:Milton Paiva
Answer:
''source: DNS and BIND, 5th Edition''
movie.edu. IN SOA toystory.movie.edu. al.movie.edu. (
1 ; Serial
3h ; Refresh after 3 hours
1h ; Retry after 1 hour
1w ; Expire after 1 week
'''1h ) ; Negative caching TTL of 1 hour'''
This is how long a remote nameserver can cache negative responses about the zone, answers that say that a particular domain name or the type of data sought for a particular domain name doesn't exist.
