Replacement tests and validations

Let's start with the DNS validations; first, we'll validate the SOA and NS records for our domain as follows:

leal@debian7:~$ dig -t any

;; ANSWER SECTION: 900  IN  A 3600  IN 3600  IN 52 900 600 86400 3600

Now let's see how the entries are for

dig -t any
;; ANSWER SECTION:  3600 IN 3600 IN ...

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