• For what purposes are the third and fourth DNS-record?

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    When I visit domain registrars, I always see four fields to change the DNS-records. However, hosting providers are asked to enter only two. For what purpose are the remaining two? P.S. I`ve only registered domains here , others I can`t speak to.

    Solutions (1)
    Under the rules of domain registration you need two different DNS-servers (two entries) with different IP-addresses. Hoster must give the domain name registrator at least two DNS-entries to ensure the domain registration was successful. This rule of the two records is provided in order to enhance reliability - if the first is not available, the call goes to the second. Often registrars allow you to register 2 entries with the same IP-address.

    It has no effect on the domain, however. If there is a potential failure or unavailability of the IP-addresses of the two DNS-servers, the domain will not work. The third and fourth entries are provided for adding the third and fourth DNS-server to improve the stability and maintenance of the domain in case the first two servers fail.
    Answers (3)
    Dns quantity of servers could be 2, 3, 4, etc. It depends on the host. 2 is the most common number of DNS servers, but this is optional.
    The quantity of DNS servers, in theory, increase the level of error tolerance. Typically 2 DNS servers are prescribed. But it could be more.
    Additional DNS-servers are used for redundancy
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