Final answer:
DNS Zone Transfer is a process that replicates DNS data across servers. However, if misconfigured, it can be a security threat called a Zone Transfer Attack. Mitigation involves restricting zone transfers to trusted servers and implementing access control.
Step-by-step explanation:
DNS Zone Transfer is the process of replicating DNS data across multiple servers. It allows for the synchronization of DNS information between the primary DNS server and secondary DNS servers. However, if misconfigured, DNS Zone Transfer can become a security threat.
A potential threat is known as a Zone Transfer Attack, where an attacker attempts to retrieve the entire DNS zone data from a vulnerable secondary DNS server. This attack can be used to gather important information about a network, such as IP addresses or subdomains, which can then be used in further attacks. To mitigate this threat, it is recommended to restrict zone transfers to trusted servers, enable access control, and regularly update DNS server software to fix any known vulnerabilities.