Is a SOA record required for a domain?

Question

Domain Name System

Hello! Tell me, is a SOA record required for a domain? And how is it formed?

Answer 1

This is how the settings in bind9 physical configs actually look like

$TTL        3600
@       IN      SOA     ns1.infoodessa.com. test.7877796.ru. (
                        2014091201       ; serial, todays date + todays serial #
                        7200              ; refresh, seconds
                        540              ; retry, seconds
                        604800              ; expire, seconds
                        86400 )            ; minimum, seconds
;

infoodessa.com. 3600 A        109.74.130.76
mail 3600 A        109.74.130.76
ns1 86400 A        109.74.130.76
ns2 86400 A        109.74.130.76
www 3600 A        109.74.130.76
infoodessa.com. 3600      MX    10   mx.yandex.ru.
infoodessa.com. 3600      NS        109.74.130.76.
infoodessa.com. 3600      NS        109.74.130.76.
109.74.130.76.in-addr.arpa  3600      PTR        infoodessa.com
infoodessa.com. 3600      TXT        "v=spf1 redirect=_spf.yandex.ru"

The SOA (Start of Authority) record or the initial record of the zone indicates on which server the reference information about the given domain is stored, contains the contact information of the person responsible for the given zone, the time parameters for caching zone information and the interaction of DNS servers.
There must be only one SOA record for a name that matches the zone name in any zone.~