An authoritative name server is a name server that only gives answers to DNS queries from data that has been configured by an original source, for example, the domain administrator or by dynamic DNS methods, in contrast to answers obtained via a query to another name server that only maintains a cache of data.
The attack, however, requires very large DNS packets, and Microsoft notes that editing the registry to limit the size of TCP packets processed by the server is a viable workaround for the vulnerability. However, the workaround should be removed after applying the available patches. DNS is a core networking component and any compromise of a DNS server could have a severe impact within an organization. This vulnerability received a patch for Windows Server 2008, which went end of life in January 2020, underscoring the severity of this issue. A DNS zone is used to host the DNS records for a particular domain. For example, the domain contoso.com may contain a number of DNS records, such as mail.contoso.com (for a mail server) and www.contoso.com (for a web site). Azure DNS allows you to host a DNS zone and thereby manage the DNS records for a domain in Azure. Generally, the DNS server is defined to a device automatically when they connect to a network, and is usually a server operated by the Internet Service Provider for the connection.
How to replicate dns record to a second dns server
The DNS recursor is a server designed to receive queries from client machines through applications such as web browsers. Typically the recursor is then responsible for making additional requests in order to satisfy the client’s DNS query.