What is zone transfer?
Zone transfer is a process of duplicating the DNS information (DNS records) from the Primary DNS zone to the Secondary DNS zone. That way, you are able to establish multiple copies of your DNS records on several name servers. As a result of completing the transfer, you are going to ensure better availability if one of the name servers goes down. In addition, you are going to guarantee faster DNS resolution in case you own an international website with users coming from all around the globe and multiple points of presence (PoPs).